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Chi-Wing Tsang
Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong (THEi), New Territories, Hong Kong SAR

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Short Biography

Dr. C.-W. Tsang is currently an academic staff of the Faculty of Science & Technology, Technological and Higher Education Institute of Hong Kong (THEi) and is a chartered chemical engineer registered with the Institution of Chemical Engineers, UK. His research interests lie primarily in the areas of catalytic engineering and how it can be applied in the research area of energy and chemical production. He is also interested in materials research such as polymer and catalytic material development for carbon mitigation. His research ability and enthusiasm are evidenced by the peer-refereed articles published in leading journals in chemistry and chemical engineering.

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Journal article
Published: 03 February 2021 in Journal of Analytical and Applied Pyrolysis
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The pyrolysis characteristics of camellia oleifera shell (COS), coal and their mixture were investigated using a thermogravimetric analyzer (TGA) and fixed-bed reactor. The decomposition reactions and kinetic analyses of COS, coal and their mixture from using TGA were compared. The results showed that during the pyrolysis process of COS and coal lonely, heat transfer hysteresis would occur with the increase of heating rates, and the synergistic effects during the co-pyrolysis of COS and coal could be enhanced by increasing the proportion of COS. In addition, from the results of kinetic analyses, in the range of 666∼750 °C, the activation energy (Ea) was gradually decreased with the increase of COS content, which was from about 59.7 kJ/mol to 12.7 kJ/mol. The effects of mixing ratio of COS to coal, pyrolysis temperature and heating rate on the pyrolysis process were further evaluated by using the fixed-bed reactor, and the optimal operating conditions were found (60% COS mixing ratio, 600 °C, and 10 °C/min) to obtain a higher yield of liquid around 30% and modifying the product composition. Gas products containing hydrogen, carbon-monoxide, carbon-dioxide and hydrocarbons were analyzed by gas chromatography (GC). Interestingly, the tar produced by co-pyrolysis of the blends was mainly composed of small molecule such as phenols, and there were basically no polycyclic aromatic hydrocarbons. For the fixed-bed reactor, the synergistic effects mainly impacted on the product composition, rather than the % distribution of the products.

ACS Style

Caixia Zhang; Shuqi Li; Shaobo Ouyang; Chi-Wing Tsang; Daolin Xiong; Kai Yang; Yuanfang Zhou; Yahui Xiao. Co-pyrolysis characteristics of camellia oleifera shell and coal in a TGA and a fixed-bed reactor. Journal of Analytical and Applied Pyrolysis 2021, 155, 105035 .

AMA Style

Caixia Zhang, Shuqi Li, Shaobo Ouyang, Chi-Wing Tsang, Daolin Xiong, Kai Yang, Yuanfang Zhou, Yahui Xiao. Co-pyrolysis characteristics of camellia oleifera shell and coal in a TGA and a fixed-bed reactor. Journal of Analytical and Applied Pyrolysis. 2021; 155 ():105035.

Chicago/Turabian Style

Caixia Zhang; Shuqi Li; Shaobo Ouyang; Chi-Wing Tsang; Daolin Xiong; Kai Yang; Yuanfang Zhou; Yahui Xiao. 2021. "Co-pyrolysis characteristics of camellia oleifera shell and coal in a TGA and a fixed-bed reactor." Journal of Analytical and Applied Pyrolysis 155, no. : 105035.

Research article
Published: 02 February 2021 in ACS Applied Polymer Materials
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Wetting of hydrophobic membranes is considered to be one of the major limitations that must be overcome to further the development of membrane distillation technology. Low surface tension liquids can induce wetting, which can significantly affect permeate conductivity after the complete wetting of the membrane pores. In this study, a thin conductive hydrophobic polyaniline (PANI) layer was sandwiched between two nonconductive polyvinylidene fluoride (PVDF) layers by the phase inversion method. The surface of this PANI-PVDF membrane was then electrosprayed with polytetrafluoroethylene to impart superhydrophobicity (water contact angle, ∼160°). Finally, the wetting of membranes was monitored and detected during direct contact membrane distillation of a low surface tension saline feed containing sodium dodecyl sulfate by electrochemical impedance spectroscopy. Compared with measuring conductivity of the permeate side, we found that measuring the cross-membrane impedance at a constant frequency (100 kHz) demonstrated more precise detection and a superior ability in distinguishing different stages of wetting and their intrusion. Further, our experiments demonstrated the possible strategies to elude membrane wetting by flushing distilled water periodically.

ACS Style

Bhaskar Jyoti Deka; Jiaxin Guo; Pak Wai Wong; Noman Khalid Khanzada; Jehad A. Kharraz; Chi-Wing Tsang; Alicia Kyoungjin An. A Conductive Hydrophobic Polyaniline Sandwiched Polyvinylidene Fluoride Membrane for Early Detection of Surfactant-Induced Wetting in Membrane Distillation Using Impedance. ACS Applied Polymer Materials 2021, 3, 679 -690.

AMA Style

Bhaskar Jyoti Deka, Jiaxin Guo, Pak Wai Wong, Noman Khalid Khanzada, Jehad A. Kharraz, Chi-Wing Tsang, Alicia Kyoungjin An. A Conductive Hydrophobic Polyaniline Sandwiched Polyvinylidene Fluoride Membrane for Early Detection of Surfactant-Induced Wetting in Membrane Distillation Using Impedance. ACS Applied Polymer Materials. 2021; 3 (2):679-690.

Chicago/Turabian Style

Bhaskar Jyoti Deka; Jiaxin Guo; Pak Wai Wong; Noman Khalid Khanzada; Jehad A. Kharraz; Chi-Wing Tsang; Alicia Kyoungjin An. 2021. "A Conductive Hydrophobic Polyaniline Sandwiched Polyvinylidene Fluoride Membrane for Early Detection of Surfactant-Induced Wetting in Membrane Distillation Using Impedance." ACS Applied Polymer Materials 3, no. 2: 679-690.

Journal article
Published: 01 February 2021 in Chinese Chemical Letters
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ACS Style

Xiaomin Kang; Guodong Fu; Xuewan Wang; Lin Shao; Weili Li; Chi-Wing Tsang; Xiao-Ying Lu; Xian-Zhu Fu; Jing-Li Luo. Copper-cobalt-nickel oxide nanowire arrays on copper foams as self-standing anode materials for lithium ion batteries. Chinese Chemical Letters 2021, 32, 938 -942.

AMA Style

Xiaomin Kang, Guodong Fu, Xuewan Wang, Lin Shao, Weili Li, Chi-Wing Tsang, Xiao-Ying Lu, Xian-Zhu Fu, Jing-Li Luo. Copper-cobalt-nickel oxide nanowire arrays on copper foams as self-standing anode materials for lithium ion batteries. Chinese Chemical Letters. 2021; 32 (2):938-942.

Chicago/Turabian Style

Xiaomin Kang; Guodong Fu; Xuewan Wang; Lin Shao; Weili Li; Chi-Wing Tsang; Xiao-Ying Lu; Xian-Zhu Fu; Jing-Li Luo. 2021. "Copper-cobalt-nickel oxide nanowire arrays on copper foams as self-standing anode materials for lithium ion batteries." Chinese Chemical Letters 32, no. 2: 938-942.

Journal article
Published: 10 September 2020 in Sustainability
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In 2013, China announced the Belt and Road Initiative (BRI), which aims to promote the connectivity of Asia, Europe, and Africa and deepen mutually beneficial economic cooperation among member countries. Past studies have reported a positive impact of the BRI on trade between China and its partner countries along the Belt and Road (B&R). However, less is known about its effect on the sectoral trade between the B&R countries and countries that show little support of the BRI. To address that gap, this study examines the changing patterns of clothing imports by the United States (US) from China and 14 B&R countries in Asia. An extended gravity model with a policy variable BRI is built to explain bilateral clothing trade flow. A panel regression model and artificial neural network (ANN) are developed based on the data collected from 1998 to 2018 and applied to predict the trade pattern of 2019. The results show a positive effect of the BRI on the clothing exports of some Asian developing countries along the B&R to the US and demonstrate the superior predictive power of the ANN. More research is needed to examine the balance between economic growth and the social and environmental sustainability of developing countries and to apply more advanced machine learning algorithms to examine global trade flow under the BRI.

ACS Style

Danny Ho; Eve Chan; Tsz Yip; Chi-Wing Tsang. The United States’ Clothing Imports from Asian Countries along the Belt and Road: An Extended Gravity Trade Model with Application of Artificial Neural Network. Sustainability 2020, 12, 7433 .

AMA Style

Danny Ho, Eve Chan, Tsz Yip, Chi-Wing Tsang. The United States’ Clothing Imports from Asian Countries along the Belt and Road: An Extended Gravity Trade Model with Application of Artificial Neural Network. Sustainability. 2020; 12 (18):7433.

Chicago/Turabian Style

Danny Ho; Eve Chan; Tsz Yip; Chi-Wing Tsang. 2020. "The United States’ Clothing Imports from Asian Countries along the Belt and Road: An Extended Gravity Trade Model with Application of Artificial Neural Network." Sustainability 12, no. 18: 7433.

Review article
Published: 05 August 2020 in Molecular Catalysis
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The recovery of waste cooking oil has long been known for second life uses without chemical modification. However, the concepts of bioeconomy and circular economy are much more recent and include a ranges of tasks such as recovery, storage, use, chemical modification. International research into the use of modified and unmodified waste cooking oil and their potential uses has been the subject of incessant research in both academia and industry. The main purpose of this review is to present the recent breakthroughs obtained in the field of recovery of used cooking oils for the last decade. The review discusses advances obtained in major production pathways recently explored splitting in the following categories: (i) transesterification of waste cooking oil including biodiesel production with heterogeneous/homogeneous base and acid catalysis, magnetic heterogeneous catalysis, biocatalysis and alternative technologies such as electrolysis, continuous flow, microwave irradiation, ultrasound irradiation; (ii) transesterification of waste cooking oil including catalytic biolubricant production; (iii) interesterification; (iv) hydrolysis and (v) hydrodeoxygenation, hydrocracking and hydrogenation. This review also briefly overviews current understanding of waste cooking oil valorization and the underpinning mechanism.

ACS Style

Mohamad R. Khodadadi; Irene Malpartida; Chi-Wing Tsang; Carol Sze Ki Lin; Christophe Len. Recent advances on the catalytic conversion of waste cooking oil. Molecular Catalysis 2020, 494, 111128 .

AMA Style

Mohamad R. Khodadadi, Irene Malpartida, Chi-Wing Tsang, Carol Sze Ki Lin, Christophe Len. Recent advances on the catalytic conversion of waste cooking oil. Molecular Catalysis. 2020; 494 ():111128.

Chicago/Turabian Style

Mohamad R. Khodadadi; Irene Malpartida; Chi-Wing Tsang; Carol Sze Ki Lin; Christophe Len. 2020. "Recent advances on the catalytic conversion of waste cooking oil." Molecular Catalysis 494, no. : 111128.

Journal article
Published: 28 June 2020 in Catalysts
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The mechanism of the solvolysis/hydrolysis of ammonia borane by iridium (Ir), cobalt (Co), iron (Fe) and ruthenium (Ru) complexes with various PNP ligands has been revisited using density functional theory (DFT). The approach of ammonia borane (NH3BH3) to the metal center has been tested on three different possible mechanisms, namely, the stepwise, concerted and proton transfer mechanism. It was found that the theoretical analyses correlate with the experimental results very well, with the activities of the iridium complexes with different PNP ligands following the order: (tBu)2P > (iPr)2P > (Ph)2P through the concerted mechanism. The reaction barriers of the rate-determining steps for the dehydrogenation of ammonia borane catalyzed by the active species [(tBu)2PNP-IrH] (Complex I-8), are found to be 19.3 kcal/mol (stepwise), 15.2 kcal/mol (concerted) and 26.8 kcal/mol (proton transfer), respectively. Thus, the concerted mechanism is the more kinetically favorable pathway. It is interesting to find that stable (tBu)2PNP Co-H2O and (tBu)2PNP Co-NH3 chelation products exist, which could stabilize the active I-8 species during the hydrolysis reaction cycle. The use of more sterically hindered and electron-donating PNP ligands such as (adamantyl)2P- provides similar activity as the t-butyl analogue. This research provides insights into the design of efficient cobalt catalysts instead of using precious and noble metal, which could benefit the development of a more sustainable hydrogen economy.

ACS Style

Yan Li; Chi-Wing Tsang; Eve Chan; Eugene Wong; Danny Ho; Xiao-Ying Lu; Changhai Liang. Sustainable Option for Hydrogen Production: Mechanistic Study of the Interaction between Cobalt Pincer Complexes and Ammonia Borane. Catalysts 2020, 10, 723 .

AMA Style

Yan Li, Chi-Wing Tsang, Eve Chan, Eugene Wong, Danny Ho, Xiao-Ying Lu, Changhai Liang. Sustainable Option for Hydrogen Production: Mechanistic Study of the Interaction between Cobalt Pincer Complexes and Ammonia Borane. Catalysts. 2020; 10 (7):723.

Chicago/Turabian Style

Yan Li; Chi-Wing Tsang; Eve Chan; Eugene Wong; Danny Ho; Xiao-Ying Lu; Changhai Liang. 2020. "Sustainable Option for Hydrogen Production: Mechanistic Study of the Interaction between Cobalt Pincer Complexes and Ammonia Borane." Catalysts 10, no. 7: 723.

Paper
Published: 30 March 2020 in Catalysis Science & Technology
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The catalytic performance of the selective hydrodeoxygenation of dibenzofuran can be controlled by the MoOx surface density and varied with the increased MoOx surface density in a volcano-shape manner.

ACS Style

Jie Zhang; Chengcheng Zhao; Chuang Li; Shenggang Li; Chi-Wing Tsang; Changhai Liang. The role of oxophilic Mo species in Pt/MgO catalysts as extremely active sites for enhanced hydrodeoxygenation of dibenzofuran. Catalysis Science & Technology 2020, 10, 2948 -2960.

AMA Style

Jie Zhang, Chengcheng Zhao, Chuang Li, Shenggang Li, Chi-Wing Tsang, Changhai Liang. The role of oxophilic Mo species in Pt/MgO catalysts as extremely active sites for enhanced hydrodeoxygenation of dibenzofuran. Catalysis Science & Technology. 2020; 10 (9):2948-2960.

Chicago/Turabian Style

Jie Zhang; Chengcheng Zhao; Chuang Li; Shenggang Li; Chi-Wing Tsang; Changhai Liang. 2020. "The role of oxophilic Mo species in Pt/MgO catalysts as extremely active sites for enhanced hydrodeoxygenation of dibenzofuran." Catalysis Science & Technology 10, no. 9: 2948-2960.

Journal article
Published: 05 March 2020 in Fuel Processing Technology
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The increasing risk of fossil fuels depletion due to surging energy demand has accelerated the search of alternative renewable sources. Lignin, one of the major components of lignocellulosic biomass, is the only abundant renewable natural resource for aromatic compounds. In this work, the effects of metals and process parameters were discussed via the catalytic hydrogenolysis of β-O-4 lignin model compound, 2-phenethyl phenyl ether. The best results were obtained over Rh/Nb2O5 with an overall conversion of 99.3% and exceptional selectivity of 98.9% to aromatic products when the hydrogenolysis was carried out at 260 °C and 0.1 MPa H2 for 4 h. The high efficiency is mainly attributed to the cooperation between Rh and NbOx at the perimeter sites, in which Rh particles are responsible for the dissociation of H2 and NbOx for activating CO bonds. With respect to depolymerize of ash wood lignin, the liquid products were mostly aromatics over Rh/Nb2O5 under 0.1 MPa H2. The results achieved in this work provide a promising prospect towards valorization of lignin into production of valuable aromatic compounds under low hydrogen pressure.

ACS Style

Weixiang Guan; Xiao Chen; Haoquan Hu; Chi-Wing Tsang; Jie Zhang; Carol Sze Ki Lin; Changhai Liang. Catalytic hydrogenolysis of lignin β-O-4 aryl ether compound and lignin to aromatics over Rh/Nb2O5 under low H2 pressure. Fuel Processing Technology 2020, 203, 106392 .

AMA Style

Weixiang Guan, Xiao Chen, Haoquan Hu, Chi-Wing Tsang, Jie Zhang, Carol Sze Ki Lin, Changhai Liang. Catalytic hydrogenolysis of lignin β-O-4 aryl ether compound and lignin to aromatics over Rh/Nb2O5 under low H2 pressure. Fuel Processing Technology. 2020; 203 ():106392.

Chicago/Turabian Style

Weixiang Guan; Xiao Chen; Haoquan Hu; Chi-Wing Tsang; Jie Zhang; Carol Sze Ki Lin; Changhai Liang. 2020. "Catalytic hydrogenolysis of lignin β-O-4 aryl ether compound and lignin to aromatics over Rh/Nb2O5 under low H2 pressure." Fuel Processing Technology 203, no. : 106392.

Journal article
Published: 21 February 2020 in Journal of Catalysis
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Co(Ni)/MoO3 catalysts were prepared, characterized and evaluated for the hydrogenolysis of bio-derived dibenzofuran (DBF), aiming at the understanding of the promoting effect of Co/Ni on MoO3 for high-yield production of aromatic products. All Co(Ni)/MoO3 catalysts selectively cleaved C-O bond, thus effectively transformed DBF to biphenyl (BP) at relatively moderate conditions. The experimental results from varying Mo species by adjusting the reduction temperature of MoO3 together with XPS and in-situ XRD characteristic were evident that Mo5+ species was responsible as the major active specie for the reaction. Promotional effect between Co(Ni) and Mo in Co(Ni)/MoO3 catalysts was observed, resulted from the presence of acidic Co(Ni)MoO4 species and a large number of Mo5+ species both of which were created local to the Co(Ni)-O-Mo interface, as can be characterized by in-situ XRD, XPS, H2-TPR, NH3-TPD, in-situ FT-IR, Raman and TEM. The trend of the initial reaction rate follows: MoO3 (0.18 μmol∙gcat−1∙s−1) < Ni/MoO3 (0.26 μmol∙gcat−1∙s−1) < Co/MoO3 (0.29 μmol∙gcat−1∙s−1), corresponding to the decreasing activation barrier. And the best catalytic activity was observed for the 100% yield of BP over Co/MoO3. A possible mechanism, including Co(Ni) facilitated reduction of Mo6+ to Mo5+ and Co(Ni) enhanced formation of acidic sites, is proposed to be responsible for the high activity in Co(Ni)/MoO3 catalysts.

ACS Style

Jie Zhang; Chuang Li; Weixiang Guan; Xiaozhen Chen; Xiao Chen; Chi-Wing Tsang; Changhai Liang. Promotional effect of Co and Ni on MoO3 catalysts for hydrogenolysis of dibenzofuran to biphenyl under atmospheric hydrogen pressure. Journal of Catalysis 2020, 383, 311 -321.

AMA Style

Jie Zhang, Chuang Li, Weixiang Guan, Xiaozhen Chen, Xiao Chen, Chi-Wing Tsang, Changhai Liang. Promotional effect of Co and Ni on MoO3 catalysts for hydrogenolysis of dibenzofuran to biphenyl under atmospheric hydrogen pressure. Journal of Catalysis. 2020; 383 ():311-321.

Chicago/Turabian Style

Jie Zhang; Chuang Li; Weixiang Guan; Xiaozhen Chen; Xiao Chen; Chi-Wing Tsang; Changhai Liang. 2020. "Promotional effect of Co and Ni on MoO3 catalysts for hydrogenolysis of dibenzofuran to biphenyl under atmospheric hydrogen pressure." Journal of Catalysis 383, no. : 311-321.

Research article
Published: 18 February 2020 in Industrial & Engineering Chemistry Research
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The efficient hydrogenolysis of dibenzofuran (DBF) was investigated at 360 °C and atmospheric hydrogen pressure with Co/MoO3 catalysts. All catalysts selectively cleaved C-O bond, thus effectively transformed DBF to biphenyl (BP) at relatively moderate conditions. A strong promotional effect in the catalytic activity was observed over Co/MoO3 catalyst with the optimal Co content of 3 wt.%, as evidenced by the decreasing activation barrier which was resulted from Co facilitated increase of active Mo species and acidic sites. The best catalytic activity was realized with almost 100 % yield of BP over Co/MoO3. During 300 h catalyst life test, the MoO3 and Co/MoO3 catalysts underwent a gradual deactivation due to the over-reduction of Mo species and carbon deposition as evidenced by the characterization of XRD, XPS, Raman, TGA-MS and TEM. However, the deactivated catalyst can be regenerated with simple calcination using O2, without losing its initial activity. Characterization studies demonstrated that the formation of MoOxCyHz played an important role in stabilizing Mo species by preventing over-reduction to inactive Mo4+ species.

ACS Style

Jie Zhang; Chuang Li; Weixiang Guan; Xiaozhen Chen; Xiao Chen; Chi-Wing Tsang; Changhai Liang. Deactivation and Regeneration Study of a Co-Promoted MoO3 Catalyst in Hydrogenolysis of Dibenzofuran. Industrial & Engineering Chemistry Research 2020, 59, 4313 -4321.

AMA Style

Jie Zhang, Chuang Li, Weixiang Guan, Xiaozhen Chen, Xiao Chen, Chi-Wing Tsang, Changhai Liang. Deactivation and Regeneration Study of a Co-Promoted MoO3 Catalyst in Hydrogenolysis of Dibenzofuran. Industrial & Engineering Chemistry Research. 2020; 59 (10):4313-4321.

Chicago/Turabian Style

Jie Zhang; Chuang Li; Weixiang Guan; Xiaozhen Chen; Xiao Chen; Chi-Wing Tsang; Changhai Liang. 2020. "Deactivation and Regeneration Study of a Co-Promoted MoO3 Catalyst in Hydrogenolysis of Dibenzofuran." Industrial & Engineering Chemistry Research 59, no. 10: 4313-4321.

Review
Published: 01 February 2020 in Bioresource Technology
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It is imminent to develop renewable resources to replace fossil-derived energies as fossil resources are on the brink of exhaustion. Lignin is one of the major components of lignocellulosic biomass, which is a natural amorphous three-dimensional polymer with abundant C-O bonds and aromatic structure. Hence, valorization of lignin into high value-added liquid fuels and chemicals is regarded as a promising strategy to mitigate fossil resource shortages. Solid acid catalysts are extensively studied due to environmentally friendly in terms of the ease of separation, recovery and reduced amount of wastes. Hence, this review focuses on summarizing the recent progress of catalytic valorization of lignin over different kinds of solid acid catalysts including zeolites, heteropolyacids, metal oxides, amorphous SiO2-Al2O3, metal phosphates, and Lewis acid. Based on reviewing of current progress of lignin conversion, the challenges and future prospects are emphasized.

ACS Style

Weixiang Guan; Chi-Wing Tsang; Carol Sze Ki Lin; Christophe Len; Haoquan Hu; Changhai Liang. A review on high catalytic efficiency of solid acid catalysts for lignin valorization. Bioresource Technology 2020, 298, 122432 .

AMA Style

Weixiang Guan, Chi-Wing Tsang, Carol Sze Ki Lin, Christophe Len, Haoquan Hu, Changhai Liang. A review on high catalytic efficiency of solid acid catalysts for lignin valorization. Bioresource Technology. 2020; 298 ():122432.

Chicago/Turabian Style

Weixiang Guan; Chi-Wing Tsang; Carol Sze Ki Lin; Christophe Len; Haoquan Hu; Changhai Liang. 2020. "A review on high catalytic efficiency of solid acid catalysts for lignin valorization." Bioresource Technology 298, no. : 122432.

Journal article
Published: 27 January 2020 in Bioresource Technology
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This study evaluates the techno-economic feasibility of sophorolipid (SL) production process that co-utilizes food waste, glucose and oleic acid as substrates. Two variables are considered in terms of (a) Plant construction: Purchasing equipment either from the US or Mainland China and (b) Production: to produce SL crystals (about 97% active) or a concentrated SL liquid/syrup (about 78% active). Hence, four scenarios are generated: Scenario I: equipment made in the USA + SL crystals; Scenario II: equipment made in the USA + SL syrup; Scenario III: equipment made in China + SL crystals; Scenario IV: equipment made in China + SL syrup. It is found that all scenarios are economically feasible and Scenario I has the highest net profit. Scenario III has the highest internal rate of return, net present value and the shortest payback period at a 7% discount rate. Finally, comparison of food waste-related techno-economic studies was conducted.

ACS Style

Huaimin Wang; Chi-Wing Tsang; Ming Ho To; Guneet Kaur; Sophie L.K.W. Roelants; Christian V. Stevens; Wim Soetaert; Carol Sze Ki Lin. Techno-economic evaluation of a biorefinery applying food waste for sophorolipid production – A case study for Hong Kong. Bioresource Technology 2020, 303, 122852 .

AMA Style

Huaimin Wang, Chi-Wing Tsang, Ming Ho To, Guneet Kaur, Sophie L.K.W. Roelants, Christian V. Stevens, Wim Soetaert, Carol Sze Ki Lin. Techno-economic evaluation of a biorefinery applying food waste for sophorolipid production – A case study for Hong Kong. Bioresource Technology. 2020; 303 ():122852.

Chicago/Turabian Style

Huaimin Wang; Chi-Wing Tsang; Ming Ho To; Guneet Kaur; Sophie L.K.W. Roelants; Christian V. Stevens; Wim Soetaert; Carol Sze Ki Lin. 2020. "Techno-economic evaluation of a biorefinery applying food waste for sophorolipid production – A case study for Hong Kong." Bioresource Technology 303, no. : 122852.

Journal article
Published: 06 December 2019 in BMC Chemical Engineering
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In this study, the conceptual process flowsheet was developed and the economic feasibility of woody biomass conversion to biofuel as feedstock was analysed by considering several promising experimental processes for lignin depolymerization, such as hydrodeoxygenation and hydrogenolysis, along with lignocellulosic biomass fractionation processes. The engineering simulation process toward the commercial production of bio-gasoline from lignocellulosic biomass using SuperPro Designer® was modeled. The compatibility of the end products with the current gasoline specifications was evaluated and various blending options were investigated to meet the octane number and Reid vapor pressure requirement of the product. The economic potential of the simulated engineering process was then evaluated from an economic perspective. The operating costs and capital investment of three scenario using three different catalytic systems were estimated and discussed to assess of the potential of commercializing of woody biomass valorization process. The main potential market segments were identified, including the process by-products such as xylose and cellulose pulp. From the economic evaluation study, it was found that selling the biomass fractionation products alone does have a greater profit than valorization of lignin to produce bio-gasoline, with net present value of RMB 22,653,000 and RMB 177,000, respectively at the same return on investment if the plant is set up in Hong Kong. It was also found that catalysts play a pivotal role in determination of the profitability in the valorization process, not only because of the price of the catalyst, but also the product distributions obtained with various types of it. To obtain the same gross profit, the sale price of bio-gasoline has to be set higher with platinum catalysts than with ruthenium catalysts (nearly 10 folds). Thus, catalyst development and process improvement are crucial in the establishment of bio-based circular economy.

ACS Style

Weixiang Guan; Sim-Ying Chua; Chi-Wing Tsang; Xiao Chen; Carol Sze Ki Lin; Raymond Sze Wai Fu; Haoquan Hu; Changhai Liang. Economic feasibility of gasoline production from lignocellulosic wastes in Hong Kong. BMC Chemical Engineering 2019, 1, 1 -20.

AMA Style

Weixiang Guan, Sim-Ying Chua, Chi-Wing Tsang, Xiao Chen, Carol Sze Ki Lin, Raymond Sze Wai Fu, Haoquan Hu, Changhai Liang. Economic feasibility of gasoline production from lignocellulosic wastes in Hong Kong. BMC Chemical Engineering. 2019; 1 (1):1-20.

Chicago/Turabian Style

Weixiang Guan; Sim-Ying Chua; Chi-Wing Tsang; Xiao Chen; Carol Sze Ki Lin; Raymond Sze Wai Fu; Haoquan Hu; Changhai Liang. 2019. "Economic feasibility of gasoline production from lignocellulosic wastes in Hong Kong." BMC Chemical Engineering 1, no. 1: 1-20.

Review
Published: 01 November 2019 in Bioresource Technology
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With the intensive development of lignocellulosic biorefineries to produce fuels and chemicals from biomass-derived carbohydrates, lignin was generated at a large quantity every year. Therefore, lignin has received increasing attention as an abundant aromatics resource in terms of research and development efforts for value-added chemicals production. In this review, studies about lignin degradation especially the crucial enzymes involved and the reaction mechanism were substantially discussed, which provided the molecular basis of lignin biodegradation. Then, the latest improvements in lignin valorization by biological methods were summarized and case studies about value-added compounds from lignin were introduced. Afterwards, challenges, opportunities and prospects regarding biorefinery of lignin were presented.

ACS Style

Chong Li; Chao Chen; Xiaofen Wu; Chi-Wing Tsang; Jinhua Mou; Jianbin Yan; Yun Liu; Carol Sze Ki Lin. Recent advancement in lignin biorefinery: With special focus on enzymatic degradation and valorization. Bioresource Technology 2019, 291, 121898 .

AMA Style

Chong Li, Chao Chen, Xiaofen Wu, Chi-Wing Tsang, Jinhua Mou, Jianbin Yan, Yun Liu, Carol Sze Ki Lin. Recent advancement in lignin biorefinery: With special focus on enzymatic degradation and valorization. Bioresource Technology. 2019; 291 ():121898.

Chicago/Turabian Style

Chong Li; Chao Chen; Xiaofen Wu; Chi-Wing Tsang; Jinhua Mou; Jianbin Yan; Yun Liu; Carol Sze Ki Lin. 2019. "Recent advancement in lignin biorefinery: With special focus on enzymatic degradation and valorization." Bioresource Technology 291, no. : 121898.

Journal article
Published: 30 October 2019 in Energies
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The Chinese petrochemical industry is facing pressure to meet strict targets of energy consumption and carbon emission reductions. Water pumps are the primary equipment used in most chemical and agrochemical industries sectors since water is commonly used for cooling and heating purposes, but these pumps also consume a large amount of energy. Other uses of water pumps in these industries include producing steam for heating, preparing reaction media or absorptive reagents, rinsing products, and distilling. As for the electrical components of the water pump systems, current technologies of variable frequency drives and superconducting transmission lines are unable to increase the energy efficiency of these systems with a fixed load. However, the Balanced Wave Technology (BWT) is offered as a solution to overcome these limitations. In this report, a case study using a BWT optimizer is conducted on a closed loop water circulation system. Two BWTs are added to the individual motor-controlled section of each pump that is being used on the switchboard. For the first time, a detailed example was provided on how to implement option B of the International Performance Measurement and Verification Protocol (IPMVP) in China by evaluating the performance of BWT as an energy conservation measure. The evaluated periods included those of the baseline, post-installation, and actual performance of the optimizers. An average saving of energy of about 10.46% is recorded in a 5-week reporting period. On this basis, that annual electricity saved is estimated to be 66,447.18 kWh, which is equivalent to the emission of 68.94 metric tons of CO2e. This case study demonstrates in detail how option B of IPMVP can be implemented for BWTs applied on pumping systems. In addition to petrochemical production plants, other industries like textile and clothing sections, which are heavy users of water and electrical energy with fixed loads in the production processes of raw materials, fiber, yarn, and fabric, as well as textile-dyeing and final treatment, could benefit from applying this new technology.

ACS Style

Man Hin Eve Chan; Kar-Kit Chu; Hin-Fung Chow; Chi-Wing Tsang; Chi Kuen Danny Ho; Shuk-Kei Ho. Improving the Energy Efficiency of Petrochemical Plant Operations: A Measurement and Verification Case Study Using a Balanced Wave Optimizer. Energies 2019, 12, 4136 .

AMA Style

Man Hin Eve Chan, Kar-Kit Chu, Hin-Fung Chow, Chi-Wing Tsang, Chi Kuen Danny Ho, Shuk-Kei Ho. Improving the Energy Efficiency of Petrochemical Plant Operations: A Measurement and Verification Case Study Using a Balanced Wave Optimizer. Energies. 2019; 12 (21):4136.

Chicago/Turabian Style

Man Hin Eve Chan; Kar-Kit Chu; Hin-Fung Chow; Chi-Wing Tsang; Chi Kuen Danny Ho; Shuk-Kei Ho. 2019. "Improving the Energy Efficiency of Petrochemical Plant Operations: A Measurement and Verification Case Study Using a Balanced Wave Optimizer." Energies 12, no. 21: 4136.

Video audio media
Published: 17 August 2019 in Journal of Visualized Experiments
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We herein present a method for the synthesis of HNbWO6, HNbMoO6, HTaWO6 solid acid nanosheet modified Pt/CNTs. By varying the weight of various solid acid nanosheets, a series of Pt/xHMNO6/CNTs with different solid acid compositions (x = 5, 20 wt%; M = Nb, Ta; N = Mo, W) have been prepared by carbon nanotube pretreatment, protonic exchange, solid acid exfoliation, aggregation and finally Pt particles impregnation. The Pt/xHMNO6/CNTs are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and NH3-temperature programmed desorption. The study revealed that HNbWO6 nanosheets were attached on CNTs, with some edges of the nanosheets being bent in shape. The acid strength of the supported Pt catalysts increases in the following order: Pt/CNTs < Pt/5HNbWO6/CNTs < Pt/20HNbMoO6/CNTs < Pt/20HNbWO6/CNTs < Pt/20HTaWO6/CNTs. In addition, the catalytic hydroconversion of lignin-derived model compound: diphenyl ether using the synthesized Pt/20HNbWO6 catalyst has been investigated.

ACS Style

Weixiang Guan; Chuang Li; Xiao Chen; Xiao-Ying Lu; Chi-Wing Tsang; Haoquan Hu; Hongxu Qi; Changhai Liang. Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether. Journal of Visualized Experiments 2019, 1 .

AMA Style

Weixiang Guan, Chuang Li, Xiao Chen, Xiao-Ying Lu, Chi-Wing Tsang, Haoquan Hu, Hongxu Qi, Changhai Liang. Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether. Journal of Visualized Experiments. 2019; (150):1.

Chicago/Turabian Style

Weixiang Guan; Chuang Li; Xiao Chen; Xiao-Ying Lu; Chi-Wing Tsang; Haoquan Hu; Hongxu Qi; Changhai Liang. 2019. "Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether." Journal of Visualized Experiments , no. 150: 1.

Review
Published: 28 May 2019 in Catalysts
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Energy and fuels derived from biomass pose lesser impact on the environmental carbon footprint than those derived from fossil fuels. In order for the biomass-to-energy and biomass-to-chemicals processes to play their important role in the loop of the circular economy, highly active, selective, and stable catalysts and the related efficient chemical processes are urgently needed. Lignin is the most thermal stable fraction of biomass and a particularly important resource for the production of chemicals and fuels. This mini review mainly focuses on lignin valorizations for renewable chemicals and fuels production and summarizes the recent interest in the lignin valorization over Ni and relevant bimetallic metal catalysts on various supports. Particular attention will be paid to those strategies to convert lignin to chemicals and fuels components, such as pyrolysis, hydrodeoxygenation, and hydrogenolysis. The review is written in a simple and elaborated way in order to draw chemists and engineers’ attention to Ni-based catalysts in lignin valorizations and guide them in designing innovative catalytic materials based on the lignin conversion reaction.

ACS Style

Xiao Chen; Weixiang Guan; Chi-Wing Tsang; Haoquan Hu; Changhai Liang. Lignin Valorizations with Ni Catalysts for Renewable Chemicals and Fuels Productions. Catalysts 2019, 9, 488 .

AMA Style

Xiao Chen, Weixiang Guan, Chi-Wing Tsang, Haoquan Hu, Changhai Liang. Lignin Valorizations with Ni Catalysts for Renewable Chemicals and Fuels Productions. Catalysts. 2019; 9 (6):488.

Chicago/Turabian Style

Xiao Chen; Weixiang Guan; Chi-Wing Tsang; Haoquan Hu; Changhai Liang. 2019. "Lignin Valorizations with Ni Catalysts for Renewable Chemicals and Fuels Productions." Catalysts 9, no. 6: 488.

Journal article
Published: 31 January 2019 in Molecular Catalysis
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Efficient upgrading of lignin bio-oils into oxygen-free liquid alkane fuels is a challenging task owing to the incompatibility of the phenolic feedstock with conventional fuels and the availability of effective hydrotreating catalysts based on the current refinery infrastructure. In this work, a series of solid acid nanosheets (HNbWO6, HNbMoO6, HTaWO6) modified Pt/CNTs bifunctional catalysts were evaluated in hydrodeoxygenation (HDO) of lignin-derived compounds. The effects of types of nanosheets and the synergistic effect between metal sites and acid sites were discussed via HDO of diphenyl ether. Pt/HNbWO6/CNTs catalyst exhibited the most efficient performance for the HDO of diphenyl ether to cyclohexane (conversion: 99.7%, selectivity: 96.4%) at 200 °C, 3.0 MPa. Several lignin aromatic model compounds including phenol, anisole, 2-phenylethyl phenyl ether and guaiacol were also investigated over Pt/HNbWO6/CNTs catalyst. Due to the different bond-dissociation energies of CO bond and steric hindrance effect, guaiacol and phenol are more difficult to be converted than diphenyl ether and anisole based on the yield of cyclohexane. It was found that the Pt/HNbWO6/CNTs catalyst exhibited favorable stability. These results validated that it is desirable to utilize this catalyst in the HDO of actual lignin macromolecules into hydrocarbon fuels.

ACS Style

Weixiang Guan; Xiao Chen; Chuang Li; Jie Zhang; Chi-Wing Tsang; Haoquan Hu; Shaojie Li; Changhai Liang. Nb(Ta)-based solid acid modified Pt/CNTs catalysts for hydrodeoxygenation of lignin-derived compounds. Molecular Catalysis 2019, 467, 61 -69.

AMA Style

Weixiang Guan, Xiao Chen, Chuang Li, Jie Zhang, Chi-Wing Tsang, Haoquan Hu, Shaojie Li, Changhai Liang. Nb(Ta)-based solid acid modified Pt/CNTs catalysts for hydrodeoxygenation of lignin-derived compounds. Molecular Catalysis. 2019; 467 ():61-69.

Chicago/Turabian Style

Weixiang Guan; Xiao Chen; Chuang Li; Jie Zhang; Chi-Wing Tsang; Haoquan Hu; Shaojie Li; Changhai Liang. 2019. "Nb(Ta)-based solid acid modified Pt/CNTs catalysts for hydrodeoxygenation of lignin-derived compounds." Molecular Catalysis 467, no. : 61-69.

Nano express
Published: 07 January 2019 in Nanoscale Research Letters
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In this study, hydrothermal synthesis of sea urchin-like NiCo2O4 was successfully demonstrated by a versatile charge-driven self-assembly strategy using positively charged poly(diallydimethylammonium chloride) (PDDA) molecules. Physical characterizations implied that sea urchin-like microspheres of ~ 2.5 μm in size were formed by self-assembly of numerous nanoneedles with a typical dimension of ~ 100 nm in diameter. Electrochemical performance study confirmed that sea urchin-like NiCo2O4 exhibited high reversible capacity of 663 mAh g−1 after 100 cycles at current density of 100 mA g−1. Rate capability indicated that average capacities of 1085, 1048, 926, 642, 261, and 86 mAh g−1 could be achieved at 100, 200, 500, 1000, 2000, and 3000 mA g−1, respectively. The excellent electrochemical performances were ascribed to the unique micro/nanostructure of sea urchin-like NiCo2O4, tailored by positively charged PDDA molecules. The proposed strategy has great potentials in the development of binary transition metal oxides with micro/nanostructures for electrochemical energy storage applications.

ACS Style

Bin Wang; Chi-Wing Tsang; Ka Ho Li; Yuanyuan Tang; Yanping Mao; Xiao-Ying Lu. Synthesis of Sea Urchin-Like NiCo2O4 via Charge-Driven Self-Assembly Strategy for High-Performance Lithium-Ion Batteries. Nanoscale Research Letters 2019, 14, 1 -9.

AMA Style

Bin Wang, Chi-Wing Tsang, Ka Ho Li, Yuanyuan Tang, Yanping Mao, Xiao-Ying Lu. Synthesis of Sea Urchin-Like NiCo2O4 via Charge-Driven Self-Assembly Strategy for High-Performance Lithium-Ion Batteries. Nanoscale Research Letters. 2019; 14 (1):1-9.

Chicago/Turabian Style

Bin Wang; Chi-Wing Tsang; Ka Ho Li; Yuanyuan Tang; Yanping Mao; Xiao-Ying Lu. 2019. "Synthesis of Sea Urchin-Like NiCo2O4 via Charge-Driven Self-Assembly Strategy for High-Performance Lithium-Ion Batteries." Nanoscale Research Letters 14, no. 1: 1-9.

Review
Published: 09 October 2018 in Journal of the Science of Food and Agriculture
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Organic solid wastes (OSWs) should be regarded as valuable resources rather than dead end landfill waste that causes public health and odor concerns. Anaerobic digestion (AD) is an ideal approach for managing organic solid waste issues and involves a consortium of anaerobic microorganisms to transform OSWs into useful products. In this review, over 100 publications related to AD of OSWs have been compiled, discussed and analyzed. A comprehensive analysis of the environmental and safety impacts of AD, its key environmental factors, co‐digestion, and pretreatment, as well as the AD of OSWs by various anaerobic microbes uncovered by high throughput sequencing based approaches, have been investigated. The purpose of this review is to provide an outline of the current knowledge of AD processes from a multi‐angle perspective. A comprehensive understanding of AD of OSWs and genome‐enabled biology development could be helpful for providing up‐to‐date knowledge of AD, developing its superiority, overcoming its drawbacks and, ultimately, improving global waste management for more efficient environmental remediation. This article is protected by copyright. All rights reserved.

ACS Style

Neng-Xiong Wang; Xiao-Ying Lu; Yiu-Fai Tsang; Yanping Mao; Chi-Wing Tsang; Vivien Au Yueng. A comprehensive review of anaerobic digestion of organic solid wastes in relation to microbial community and enhancement process. Journal of the Science of Food and Agriculture 2018, 99, 507 -516.

AMA Style

Neng-Xiong Wang, Xiao-Ying Lu, Yiu-Fai Tsang, Yanping Mao, Chi-Wing Tsang, Vivien Au Yueng. A comprehensive review of anaerobic digestion of organic solid wastes in relation to microbial community and enhancement process. Journal of the Science of Food and Agriculture. 2018; 99 (2):507-516.

Chicago/Turabian Style

Neng-Xiong Wang; Xiao-Ying Lu; Yiu-Fai Tsang; Yanping Mao; Chi-Wing Tsang; Vivien Au Yueng. 2018. "A comprehensive review of anaerobic digestion of organic solid wastes in relation to microbial community and enhancement process." Journal of the Science of Food and Agriculture 99, no. 2: 507-516.