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Prof. Sibudjing Kawi is a productive researcher and has published more than 300 international peer-reviewed journal articles (with citations > 15,500 and h-index = 69). He obtained his PhD in Delaware and has been attached to the Department of Chemical and Biomolecular Engineering at the National University of Singapore since 1994. In the past decade, his research has focused on the design and synthesis of nanocatalysts for green and sustainable development, such as CO2 reforming with methane to bio-syngas and hydrogen, alcohol autothermal reforming, biogas reforming, biomass gasification, and water-gas shift reactions. His expertise also includes the synthesis of novel inorganic membranes, as well as catalytic membrane reactors with in situ oxygen, hydrogen, and CO2 separation and reaction.
Coking and metal sintering are limitations of large-scale applications of Ni/Al2O3 catalysts in DRM reactions. In this review, several modification strategies to enhance the anti-deactivation property of Ni/Al2O3 are proposed and discussed with the recently developed catalyst systems, including structure and morphology control, surface acidity/basicity, interfacial engineering and oxygen defects. In addition, the structure–performance relationship and deactivation/anti-deactivation mechanisms are illustrated in depth, followed by prospects for future work.
Xingyuan Gao; Zhiyong Ge; Guofeng Zhu; Ziyi Wang; Jangam Ashok; Sibudjing Kawi. Anti-Coking and Anti-Sintering Ni/Al2O3 Catalysts in the Dry Reforming of Methane: Recent Progress and Prospects. Catalysts 2021, 11, 1003 .
AMA StyleXingyuan Gao, Zhiyong Ge, Guofeng Zhu, Ziyi Wang, Jangam Ashok, Sibudjing Kawi. Anti-Coking and Anti-Sintering Ni/Al2O3 Catalysts in the Dry Reforming of Methane: Recent Progress and Prospects. Catalysts. 2021; 11 (8):1003.
Chicago/Turabian StyleXingyuan Gao; Zhiyong Ge; Guofeng Zhu; Ziyi Wang; Jangam Ashok; Sibudjing Kawi. 2021. "Anti-Coking and Anti-Sintering Ni/Al2O3 Catalysts in the Dry Reforming of Methane: Recent Progress and Prospects." Catalysts 11, no. 8: 1003.
Highly dispersed Mn metallic nanoparticles (15.87 nm on average) on a nitrogen-doped porous carbon matrix were prepared by thermal treatment of MnO2-x/polyaniline (PANI), which was derived from the in situ polymerization of aniline monomers initiated by γ-MnO2 nanosheets. Owing to the large surface area (1287 m2/g), abundant active sites, nitrogen dopants and highly dispersed Mn sites on graphitic carbon, an impressive specific capacity of 1319.4 mAh g−1 with an admirable rate performance was delivered in a Li-S battery. After 220 cycles at 1 C, 80.6% of the original capacity was retained, exhibiting a good cycling stability.
Xingyuan Gao; Ruliang Liu; Lixia Wu; Changdi Lai; Yubin Liang; Manli Cao; Jingyu Wang; Wei Yin; Xihong Lu; Sibudjing Kawi. Mn-N-C Nanostructure Derived from MnO2-x/PANI as Highly Performing Cathode Additive in Li-S Battery. Reactions 2021, 2, 275 -286.
AMA StyleXingyuan Gao, Ruliang Liu, Lixia Wu, Changdi Lai, Yubin Liang, Manli Cao, Jingyu Wang, Wei Yin, Xihong Lu, Sibudjing Kawi. Mn-N-C Nanostructure Derived from MnO2-x/PANI as Highly Performing Cathode Additive in Li-S Battery. Reactions. 2021; 2 (3):275-286.
Chicago/Turabian StyleXingyuan Gao; Ruliang Liu; Lixia Wu; Changdi Lai; Yubin Liang; Manli Cao; Jingyu Wang; Wei Yin; Xihong Lu; Sibudjing Kawi. 2021. "Mn-N-C Nanostructure Derived from MnO2-x/PANI as Highly Performing Cathode Additive in Li-S Battery." Reactions 2, no. 3: 275-286.
K-MER zeolites of great crystallinity and purity have been synthesized from coal fly ash (CFA) with the method of microwave and ultrasound collaborative activation (MUCA) for the first time, which significantly improving the extraction efficiency of required components (Si and Al) from CFA in lower energy consumption. After activated in 4 mol/L potassium hydroxide solution for 1 h at 100 °C, the conversion rate of CFA reaches to 53.80 wt% as well as the molar conversion rate of silicon is 75.39%, greatly enhanced in comparison with the methods of only microwave or ultrasound. The MER samples of various morphologies have been prepared through comprehensively adjustments of crystallization time, pressures and dynamic pressure programs. The maximum adsorption volume of CO2 is 47.58 cm3/g at 25 °C as well as 36.55 cm3/g at 0 °C and 34.16 cm3/g at 50 °C. Furthermore, the as-obtained MER zeolites have been utilized as catalysts in cyanoethylatic reaction between methanol and acrylonitrile. The conversion rate of acrylonitrile finally reached up to as high as 99 wt% after reacting for 30 min with pre-pressure of 1.5 MPa. The method of MUCA will provide a new strategy for green utilization and high value-added conversion of CFA.
Wenting Chen; Guoqiang Song; Youyuan Lin; Jintao Qiao; Tonghua Wu; Xingyuan Yi; Sibudjing Kawi. A green and efficient strategy for utilizing of coal fly ash to synthesize K-MER zeolite as catalyst for cyanoethylation and adsorbent of CO2. Microporous and Mesoporous Materials 2021, 326, 111353 .
AMA StyleWenting Chen, Guoqiang Song, Youyuan Lin, Jintao Qiao, Tonghua Wu, Xingyuan Yi, Sibudjing Kawi. A green and efficient strategy for utilizing of coal fly ash to synthesize K-MER zeolite as catalyst for cyanoethylation and adsorbent of CO2. Microporous and Mesoporous Materials. 2021; 326 ():111353.
Chicago/Turabian StyleWenting Chen; Guoqiang Song; Youyuan Lin; Jintao Qiao; Tonghua Wu; Xingyuan Yi; Sibudjing Kawi. 2021. "A green and efficient strategy for utilizing of coal fly ash to synthesize K-MER zeolite as catalyst for cyanoethylation and adsorbent of CO2." Microporous and Mesoporous Materials 326, no. : 111353.
In this paper, a superb water permeable membrane is prepared by treating an alumina hollow fiber supported metal-organic framework (MOF) membrane with a hydrophilic ionic liquid (IL). For ternary mixture of H2O/CO2/H2 separation, the IL layer separates H2O and CO2 from H2 and the MOF layer functions as a selective layer for further separation of H2O/CO2. Furthermore, owing to the high hydrophilicity of the IL, water permeation is enhanced comparing to the pristine MOF membrane. At extremely harsh conditions with the temperature high up to 200 °C and the pressure high up to 20 bar, this IL/MOF membrane has achieved excellent water vapor/gases separation performance, with a high water permeance of 7.7*10−8 mol m−2 s−1 Pa−1 and high separation factor for water vapor/gases (~472 for H2O/H2 and ~280 for H2O/CO2).
Zhan Li; Yuzhen Deng; Zhigang Wang; Jiawei Hu; Kok Giap Haw; Guangcheng Wang; Sibudjing Kawi. A superb water permeable membrane for potential applications in CO2 to liquid fuel process. Journal of Membrane Science 2021, 639, 119682 .
AMA StyleZhan Li, Yuzhen Deng, Zhigang Wang, Jiawei Hu, Kok Giap Haw, Guangcheng Wang, Sibudjing Kawi. A superb water permeable membrane for potential applications in CO2 to liquid fuel process. Journal of Membrane Science. 2021; 639 ():119682.
Chicago/Turabian StyleZhan Li; Yuzhen Deng; Zhigang Wang; Jiawei Hu; Kok Giap Haw; Guangcheng Wang; Sibudjing Kawi. 2021. "A superb water permeable membrane for potential applications in CO2 to liquid fuel process." Journal of Membrane Science 639, no. : 119682.
Pure LTA zeolites of high crystallinity have been synthesized from coal fly ash (CFA) by utilizing a method of microwave and ultrasound collaborative activation (MUCA) in situ for the first time. Compared to the activation method of only microwave or ultrasound, the MUCA have more efficient ability to dissolve silica-aluminum species from CFA while avoiding the digestion of other impurities, greatly reduced the energy consumption. While the liquid-solid ratio (LSR) of sodium hydroxide solution to CFA was 10 mL/g, the molar conversion rates of silicon and aluminum were 70.26% and 68.03%, respectively. Furthermore, with different LSR, pure LTA zeolite could be synthesized by adjusting the ratio of Si/Al. The CFA used in this paper contains Fe2O3 of about 12 weight percentage, and there have found almost no element of iron existing in the LTA zeolite products, indicating that the method of MUCA is suitable for the preparation of high purity zeolite. Finally, according to the mechanism of crystallization-dissolution-recrystallization, the morphology of LTA products could be well tuned by adjusting parameters such as LSR or crystallization time. The maximum BET surface area was 474 m2/g without additional calcium ion exchange steps by directly using of municipal water instead of deionized water, and the maximum CO2 adsorption capacity was 1.96 mol/g under 0 ℃. The mesoporous LTA zeolite aslo have been prepared just through the adjustment of crystallization time without addtion of any other templates, the intramesopores of about 17 nm made greatly improvement in catalytic cracking of 1,3,5-tri-isopropylbenzene which is inaccessible to the conventional LTA micropores, and the conversion rate of 1,3,5-tri-isopropylbenzene reached to 25.40% as well as 11.05% of the selectivity of secondary cracking product benzene.
Wenting Chen; Guoqiang Song; Youyuan Lin; Jintao Qiao; Tonghua Wu; Xingyuan Yi; Sibudjing Kawi. Synthesis and catalytic performance of Linde-type A zeolite (LTA) from coal fly ash utilizing microwave and ultrasound collaborative activation method. Catalysis Today 2021, 1 .
AMA StyleWenting Chen, Guoqiang Song, Youyuan Lin, Jintao Qiao, Tonghua Wu, Xingyuan Yi, Sibudjing Kawi. Synthesis and catalytic performance of Linde-type A zeolite (LTA) from coal fly ash utilizing microwave and ultrasound collaborative activation method. Catalysis Today. 2021; ():1.
Chicago/Turabian StyleWenting Chen; Guoqiang Song; Youyuan Lin; Jintao Qiao; Tonghua Wu; Xingyuan Yi; Sibudjing Kawi. 2021. "Synthesis and catalytic performance of Linde-type A zeolite (LTA) from coal fly ash utilizing microwave and ultrasound collaborative activation method." Catalysis Today , no. : 1.
Biomass is an abundant source of energy, and its utilization will increase in the near future. One of the promising ways to recapture energy from biomass is by the gasification process. The primary product from biomass gasification (synthesis gas) can be used for a wide range of applications. By-products such as tar are also produced along with synthesis gas, which needs to be removed or converted catalytically. In recent times, a tremendous effort has been made to develop efficient and cheap catalysts for catalytic conversion of tar. Among many kinds of catalysts, the catalysts derived from natural minerals (olivine or dolomite) and solid waste (incinerated bottom ash or biochar) will make the process more sustainable. Therefore, in this review, the development of natural minerals and waste-derived catalysts for the biomass-derived tar reforming reaction was summarized. Besides tar conversion by thermal catalytic processes, the tar conversion is also highlighted using a low-temperature plasma process combined with catalysts. Furthermore, the possible process intensification by applying selective gas separable membranes was also summarized. The selective O2 permeable membrane at the tar reforming zone improves the stability of the catalyst and quality of syngas by gasifying the deposited coke during the reforming reaction. Finally, a conclusion section covering possible challenges associated with biomass tar reforming technology, membranes, and plasma catalysis was provided.
Sibudjing Kawi; Jangam Ashok; Nikita Dewangan; Subhasis Pati; Chen Junmei. Recent Advances in Catalyst Technology for Biomass Tar Model Reforming: Thermal, Plasma and Membrane Reactors. Waste and Biomass Valorization 2021, 1 -30.
AMA StyleSibudjing Kawi, Jangam Ashok, Nikita Dewangan, Subhasis Pati, Chen Junmei. Recent Advances in Catalyst Technology for Biomass Tar Model Reforming: Thermal, Plasma and Membrane Reactors. Waste and Biomass Valorization. 2021; ():1-30.
Chicago/Turabian StyleSibudjing Kawi; Jangam Ashok; Nikita Dewangan; Subhasis Pati; Chen Junmei. 2021. "Recent Advances in Catalyst Technology for Biomass Tar Model Reforming: Thermal, Plasma and Membrane Reactors." Waste and Biomass Valorization , no. : 1-30.
Germanium has emerged recently as a potential promoter for Pt-based catalysts for propane dehydrogenation (PDH) . However, its general practicality with other noble metals remains unexplored. Herein, the catalytic performance of Pd-Ge/SiO2 was investigated in propane dehydrogenation (PDH), wherein a significant improvement of the catalytic performance was obtained by Ge addition. Pd2/SiO2, the unpromoted sample, shows an initial conversion and selectivity of 21.0% and 53.6% at 550 °C, respectively. In addition, it deactivates rapidly with a deactivation constant (kd) of 1.7 × 10−2 min−1. Ge-promoted samples exhibit a slight decrease in activity, while catalyst selectivity and stability significantly increase. Upon adding 1 wt.% Ge (Pd2-Ge1/SiO2), the initial conversion decreases to 15.2%, whereas the initial selectivity increases to 91.9%. Further addition of Ge (2 wt.%, Pd2-Ge2/SiO2) leads to an initial conversion of 12.5% and an initial selectivity of 95.0%. Regarding catalyst stability, the deactivation constant is almost one order of magnitude lower for Ge-promoted catalysts (i.e., with 1 wt.% and 2 wt.% Ge); 2.9 × 10−3 min−1 and 2.0 × 10−3 min−1, respectively. The characterization results indicate that Ge imposes geometric and electronic modifications on Pd, decreasing catalytic activity for structure-sensitive side reactions and facilitating propylene desorption from surface. Hence, both the selectivity and stability of the catalysts have been significantly enhanced.
Sajjad Rimaz; Mohammadreza Kosari; Luwei Chen; Sibudjing Kawi; Armando Borgna. Enhanced catalytic performance of Pd nanoparticles during propane dehydrogenation by germanium promotion. Molecular Catalysis 2021, 510, 111672 .
AMA StyleSajjad Rimaz, Mohammadreza Kosari, Luwei Chen, Sibudjing Kawi, Armando Borgna. Enhanced catalytic performance of Pd nanoparticles during propane dehydrogenation by germanium promotion. Molecular Catalysis. 2021; 510 ():111672.
Chicago/Turabian StyleSajjad Rimaz; Mohammadreza Kosari; Luwei Chen; Sibudjing Kawi; Armando Borgna. 2021. "Enhanced catalytic performance of Pd nanoparticles during propane dehydrogenation by germanium promotion." Molecular Catalysis 510, no. : 111672.
Carbon deposits typically enforce shutdowns of chemical reactors to periodically regenerate their active materials, a continuous challenge for industry and scientists alike. This downside can however be turned to benefit by utilizing carbon’s reductive power. Here, we integrate dry reforming of methane (DRM) and selective reduction of nitric oxide (SRN) in a novel chemical looping process, coupled by the periodic deposition and removal of surface carbon, which participates in both reactions. Carbon formed on the catalyst during dry reforming is subsequently used as reductant for nitric oxide (NO) conversion into N2, hence not only achieves stable CO2 utilization and NO reduction with cyclic catalyst regeneration, but also reduces the consumption of valuable energy resources demanded by NO removal. In contrast to co-feeding all reactants in a single step, the inherent temporal-spatial separation of reactions in chemical looping allows for complete conversion of carbon and NO, ensuring a higher exergetic efficiency (70 % more efficient). Also, adaptation of the relative duration of the DRM and SRN steps to the conditions of the CO2 and NO industrial point sources allows to account for the differences in supply of carbon and NO, offering an attractive strategy for selective catalytic reduction of NO with greenhouse gases rather than NH3.
Jiawei Hu; Vladimir V. Galvita; Hilde Poelman; Zhigang Wang; Guy B. Marin; Sibudjing Kawi. Coupling CO2 utilization and NO reduction in chemical looping manner by surface carbon. Applied Catalysis B: Environmental 2021, 297, 120472 .
AMA StyleJiawei Hu, Vladimir V. Galvita, Hilde Poelman, Zhigang Wang, Guy B. Marin, Sibudjing Kawi. Coupling CO2 utilization and NO reduction in chemical looping manner by surface carbon. Applied Catalysis B: Environmental. 2021; 297 ():120472.
Chicago/Turabian StyleJiawei Hu; Vladimir V. Galvita; Hilde Poelman; Zhigang Wang; Guy B. Marin; Sibudjing Kawi. 2021. "Coupling CO2 utilization and NO reduction in chemical looping manner by surface carbon." Applied Catalysis B: Environmental 297, no. : 120472.
Synthesis of well dispersed and strongly interacted Ni-based catalysts benefits the catalytic performances in high-temperature reactions. Significant works have been reported on the roles of calcination environments. During calcination of the catalyst precursors (pretreatment or activation in other cases), the type of atmospheres greatly affects the size, metal-support interaction (MSI) and surface properties of Ni-based catalysts, influencing the catalytic performances. In this review, it is the first time to comprehensively summarize the influences of three categories of atmospheres – oxidative (air, O2 and CO2), inert (N2, Ar) and reductive (H2, NO, N2O and CO) gases, on the physiochemical properties of Ni-based catalysts, which provides a facile and general strategy to optimize the formation of metal nanoparticles on the supports.
Xingyuan Gao; Jangam Ashok; Sibudjing Kawi. A review on roles of pretreatment atmospheres for the preparation of efficient Ni-based catalysts. Catalysis Today 2021, 1 .
AMA StyleXingyuan Gao, Jangam Ashok, Sibudjing Kawi. A review on roles of pretreatment atmospheres for the preparation of efficient Ni-based catalysts. Catalysis Today. 2021; ():1.
Chicago/Turabian StyleXingyuan Gao; Jangam Ashok; Sibudjing Kawi. 2021. "A review on roles of pretreatment atmospheres for the preparation of efficient Ni-based catalysts." Catalysis Today , no. : 1.
Efficient integration of calcium-looping (CaL) and dry reforming of methane (DRM), termed as CaLDRM, into an isothermal process implemented on a bifunctional Ni-CaO based material is a promising technology to achieve CO2 capture and in-situ conversion to syngas, thereby allowing a win–win for environment and economy. The core of this technology is the employed material which should ensure both good CO2 capture capacity and significant catalytic activity at a temperature matching CaL and DRM. To this end, we synthesize a Ni supported porous CeO2-modified CaO microsphere to serve as the bifunctional material by a combination of template-assisted hydrothermal and impregnation method. This material successfully drives cyclic CO2 capture and conversion at the same temperature of 650 °C, i.e. simultaneously realizing high-temperature CaL and low-temperature DRM. The role of Ce on boosting the material performance originates from two aspects: on the one hand, the homogeneously mixed CeO2, as an activity promoter, enhances the CO2 affinity of CaO and the low-temperature activity of Ni, enabling higher CO2 capture and conversion capacities at 650 °C; on the other hand, it, as a structure stabilizer, improves the sinter resistance of CaO and the dispersion of Ni, maintaining the CaL kinetics and catalytic DRM activity. Following the premise of minimizing additive quantity, the bifunctional material constructed from the support with a Ca:Ce molar ratio of 85:15 shows stable CO2 uptake and syngas yield during the isothermal CaLDRM cycles at 650 °C, exceeding the performance of unmodified material by more than 2 times.
Jiawei Hu; Plaifa Hongmanorom; Prae Chirawatkul; Sibudjing Kawi. Efficient integration of CO2 capture and conversion over a Ni supported CeO2-modified CaO microsphere at moderate temperature. Chemical Engineering Journal 2021, 426, 130864 .
AMA StyleJiawei Hu, Plaifa Hongmanorom, Prae Chirawatkul, Sibudjing Kawi. Efficient integration of CO2 capture and conversion over a Ni supported CeO2-modified CaO microsphere at moderate temperature. Chemical Engineering Journal. 2021; 426 ():130864.
Chicago/Turabian StyleJiawei Hu; Plaifa Hongmanorom; Prae Chirawatkul; Sibudjing Kawi. 2021. "Efficient integration of CO2 capture and conversion over a Ni supported CeO2-modified CaO microsphere at moderate temperature." Chemical Engineering Journal 426, no. : 130864.
An ordered mesoporous ceria, mpCeO2, was synthesized using nanocasting, followed by strong electrostatic adsorption to prepare Ni nanoparticles encapsulated in mpCeO2 for CO2 methanation. At 225 °C, TOF of Ni/mpCeO2 catalyst (0.183 s−1) is 3 times higher than that of Ni catalyst supported on conventional CeO2 prepared by the same method (0.057 s−1). Characterization results indicate that encapsulated structure provides rich Ni-CeO2 interface with more oxygen vacancies, playing a key role in CO2 activation. As evidenced by in-situ DRIFTS experiments, CO2 activation over Ni/mpCeO2 catalyst occurs through combined associative and dissociative mechanisms. Moreover, small and highly dispersed Ni nanoparticles in channels of mpCeO2 facilitate H2 dissociation, supplying sufficient *H for CO hydrogenation with *HCO intermediate species and leading to high CH4 selectivity. In addition to enhanced low-temperature activity and selectivity, Ni/mpCeO2 catalyst is very stable throughout 70 h since metal sintering can be inhibited by confinement effect of mesoporous structure.
Plaifa Hongmanorom; Jangam Ashok; Prae Chirawatkul; Sibudjing Kawi. Interfacial synergistic catalysis over Ni nanoparticles encapsulated in mesoporous ceria for CO2 methanation. Applied Catalysis B: Environmental 2021, 297, 120454 .
AMA StylePlaifa Hongmanorom, Jangam Ashok, Prae Chirawatkul, Sibudjing Kawi. Interfacial synergistic catalysis over Ni nanoparticles encapsulated in mesoporous ceria for CO2 methanation. Applied Catalysis B: Environmental. 2021; 297 ():120454.
Chicago/Turabian StylePlaifa Hongmanorom; Jangam Ashok; Prae Chirawatkul; Sibudjing Kawi. 2021. "Interfacial synergistic catalysis over Ni nanoparticles encapsulated in mesoporous ceria for CO2 methanation." Applied Catalysis B: Environmental 297, no. : 120454.
Ammonia production via N2 activation and electroreduction under ambient conditions has triggered considerable interests because it is a cleaner and more sustainable process compared with the traditional Haber-Bosch process. Designing efficient electrocatalysts is crucial to solve the inherent low energy efficiency issue of N2 reduction reaction (NRR) to sustainably produce NH3. This review summarizes the recent progress in design strategies of efficient NRR electrocatalysts including electronic structure tuning to enhance the intrinsic activity and active sites exposuring to improve the apparent activity. Further, experimental protocols to achieve reliable NRR results are also discussed and proposed. This review is expected to inspire novel electrocatalysts design to promote the NRR research field.
Ziwei Li; Min Li; Jiachen Yang; Mingyue Liao; Jianxin Cao; Fei Liu; Zhigang Wang; Sibudjing Kawi; Qian Lin. Electrocatalyst design strategies for ammonia production via N2 reduction. Catalysis Today 2021, 1 .
AMA StyleZiwei Li, Min Li, Jiachen Yang, Mingyue Liao, Jianxin Cao, Fei Liu, Zhigang Wang, Sibudjing Kawi, Qian Lin. Electrocatalyst design strategies for ammonia production via N2 reduction. Catalysis Today. 2021; ():1.
Chicago/Turabian StyleZiwei Li; Min Li; Jiachen Yang; Mingyue Liao; Jianxin Cao; Fei Liu; Zhigang Wang; Sibudjing Kawi; Qian Lin. 2021. "Electrocatalyst design strategies for ammonia production via N2 reduction." Catalysis Today , no. : 1.
Catalytic reforming of hydrocarbons with CO2 as an oxidant is an attractive route to re-use CO2 and to produce valuable syngas as a source of hydrogen or as a feedstock for liquid fuel production. CO2 (dry) reforming of methane to syngas is, hence, an area of key research focus, both from an environmental and commercial aspect. However, catalytic dry reforming under industrially relevant conditions poses severe challenges toward catalyst materials. Rapid catalyst deactivation by coke deposition and metal sintering at high operating temperature hinders the large-scale implementation of this technology. Core-shell structured catalysts are a relatively new class of nanomaterials that allow a controlled integration of the functions of complementary materials with optimized compositions and morphologies. Core-shell catalysts offer distinctive advantages over conventional supported catalysts for CO2 reforming reactions by inhibiting coke formation and suppressing metal sintering. This chapter discusses the performance and recent advances of core-shell catalysts for CO2 reforming of methane to produce syngas.
Sonali Das; Sibudjing Kawi. Core-Shell Structured Catalysts for Catalytic Conversion of CO2 to Syngas. Nanocarbons for Energy Conversion: Supramolecular Approaches 2021, 121 -149.
AMA StyleSonali Das, Sibudjing Kawi. Core-Shell Structured Catalysts for Catalytic Conversion of CO2 to Syngas. Nanocarbons for Energy Conversion: Supramolecular Approaches. 2021; ():121-149.
Chicago/Turabian StyleSonali Das; Sibudjing Kawi. 2021. "Core-Shell Structured Catalysts for Catalytic Conversion of CO2 to Syngas." Nanocarbons for Energy Conversion: Supramolecular Approaches , no. : 121-149.
A series of LaNi1-xCoxO3 (x = 0, 0.2, 0.5, 0.8 and 1) perovskite catalysts were prepared successfully and applied for toluene steam reforming as a model tar molecule. The Ni–Co alloy formation in reduced LaNi1-xCoxO3 was confirmed by TPR, XRD and XPS. The strong interaction in LaNi0.8Co0.2O3 between Ni and Co produced highly dispersed and smaller metal (8–9 nm), higher reducibility and larger amounts of active sites as well as more abundant oxygen defects and higher surface/lattice oxygen mobility, confirmed by XRD, TEM, TPR, XPS and O2-TPD. Also, a higher electron density prevented Ni from oxidation and sintering; a more oxidized Co (Co3+) facilitated the dissociation of water and activation of CO2, thus removing the coke. At 600 °C, S/C = 3.4 and WHSV = 16.56 ml h−1 gcat−1, an equilibrium conversion was achieved initially and over 80% conversion after 24 h were obtained for LaNi0.8Co0.2O3 with a high H2 yield (81.8% at maximum) and 8.0 of H2/CO ratio. The graphitic/filamentous coke formation was alleviated and no metal sintering was presented after the reaction.
Xingyuan Gao; Jangam Ashok; Sibudjing Kawi; Naitao Yang. Steam reforming of toluene as model compound of biomass tar over Ni–Co/La2O3 nano-catalysts: Synergy of Ni and Co. International Journal of Hydrogen Energy 2021, 46, 30926 -30936.
AMA StyleXingyuan Gao, Jangam Ashok, Sibudjing Kawi, Naitao Yang. Steam reforming of toluene as model compound of biomass tar over Ni–Co/La2O3 nano-catalysts: Synergy of Ni and Co. International Journal of Hydrogen Energy. 2021; 46 (60):30926-30936.
Chicago/Turabian StyleXingyuan Gao; Jangam Ashok; Sibudjing Kawi; Naitao Yang. 2021. "Steam reforming of toluene as model compound of biomass tar over Ni–Co/La2O3 nano-catalysts: Synergy of Ni and Co." International Journal of Hydrogen Energy 46, no. 60: 30926-30936.
Recently, biomass gasification has garnered a lot of attention due to its potential to produce hydrogen-rich syngas. In this research paper, H2S resistant catalysts for steam reforming of toluene as a model tar compound is studied on CeO2-NiO-MgO-Al2O3 (Ce-NMA) hydrotalcite-derived catalysts synthesized by homogeneous urea hydrolysis. A family of Ce-NMA catalysts were synthesized with different Ce loading: 0Ce-NMA, 5Ce-NMA, 10Ce-NMA, 15Ce-NMA and 20Ce-NMA. Among all the catalysts, the performance of the catalysts improved up to 15Ce-NMA, which showed the most stable performance in the presence of H2S poison. The H2-TPR and XPS showed that the presence of ceria improved the reducibility of the catalysts by facilitating electron transfer to nickel. 15Ce-NMA gave a conversion of 82%, whereas 20Ce-NMA showed a 96% toluene conversion. However, the recovery of 15Ce-NMA was very quick (30-45min) as against that of 20Ce-NMA, which deactivated to 40% conversion and took 2 h to recover the performance. The XPS of reduced catalysts showed that Ni0/Ni2+ ratio constantly increased with increasing ceria loading due to the Ce3+/Ce4+ redox pairs, which aided the reduction of Ni2+ to Ni0. The TG/DTA analysis revealed that the highest amount of carbon was formed over 0Ce-NMA and 20Ce-NMA, meaning Ce loading was only effective till a certain amount. 15Ce-NMA demonstrated lower carbon deposition as compared to 0Ce-NMA and 20Ce-NMA. Raman analysis revealed that the type of carbon varied in the 20Ce-NMA. The graphitic carbon decreased till 15Ce-NMA but suddenly increased in 20Ce-NMA, leading to higher carbon deposition and lower activity in the catalyst.
Shanmukapriya Jayaprakash; Nikita Dewangan; Ashok Jangam; Sibudjing Kawi. H2S-resistant CeO2-NiO-MgO-Al2O3 LDH-derived catalysts for steam reforming of toluene. Fuel Processing Technology 2021, 219, 106871 .
AMA StyleShanmukapriya Jayaprakash, Nikita Dewangan, Ashok Jangam, Sibudjing Kawi. H2S-resistant CeO2-NiO-MgO-Al2O3 LDH-derived catalysts for steam reforming of toluene. Fuel Processing Technology. 2021; 219 ():106871.
Chicago/Turabian StyleShanmukapriya Jayaprakash; Nikita Dewangan; Ashok Jangam; Sibudjing Kawi. 2021. "H2S-resistant CeO2-NiO-MgO-Al2O3 LDH-derived catalysts for steam reforming of toluene." Fuel Processing Technology 219, no. : 106871.
Converting CO2 to valuable chemicals via catalytic CO2 hydrogenation presents a promising way for CO2 utilization. However, many types of CO2 hydrogenation are generally conducted under harsh conditions (T≧200 °C and P≧20 bar), yet these reactions are limited by thermodynamic equilibrium. Water is a common by-product in CO2 hydrogenation reactions. By employing a water permeable membrane reactor to simultaneously remove water from the reaction, not only favors the higher CO2 conversion by overcoming the limitation of thermodynamic equilibrium, but also protects the catalyst from deactivation caused by water. The development of a suitable membrane reactor for this application has received huge attention worldwide. However, water separation from gases (H2, CO2, CO) under high temperature and pressure is a major challenge in developing a good performance membrane. Herein, this review contains various high temperature water/gases separating membranes, and their applications in water permeable membrane reactors for CO2 utilization. The separation and reaction mechanism in the catalytic membrane reactors are discussed in detail. Furthermore, challenges and prospects in the application of this type of catalytic membrane reactor in CO2 conversion is provided for the future development.
Zhan Li; Yuzhen Deng; Nikita Dewangan; Jiawei Hu; Zhigang Wang; Xiaoyao Tan; Shaomin Liu; Sibudjing Kawi. High Temperature Water Permeable Membrane Reactors for CO2 Utilization. Chemical Engineering Journal 2021, 420, 129834 .
AMA StyleZhan Li, Yuzhen Deng, Nikita Dewangan, Jiawei Hu, Zhigang Wang, Xiaoyao Tan, Shaomin Liu, Sibudjing Kawi. High Temperature Water Permeable Membrane Reactors for CO2 Utilization. Chemical Engineering Journal. 2021; 420 ():129834.
Chicago/Turabian StyleZhan Li; Yuzhen Deng; Nikita Dewangan; Jiawei Hu; Zhigang Wang; Xiaoyao Tan; Shaomin Liu; Sibudjing Kawi. 2021. "High Temperature Water Permeable Membrane Reactors for CO2 Utilization." Chemical Engineering Journal 420, no. : 129834.
Steam reforming of toluene (SRT) as a model tar compound is studied on Ni–MgO–Al2O3 hydrotalcite synthesized by different methods: urea hydrolysis, coprecipitation, and wet impregnation. The two wet-impregnated catalysts were produced by immersing MgO–Al2O3 hydrotalcites synthesized by urea hydrolysis and coprecipitation in Ni2+ solution to produce the corresponding impregnated catalysts. Among all the catalysts, both the samples prepared by urea hydrolysis gave superior toluene conversion of ~85% and also improved the resistance to carbon deposits. The two coprecipitation catalysts had a low toluene conversion of ~63% and also produced more coke. The X-ray photoelectron spectroscopy studies showed that impregnated catalyst produced from urea hydrolysis imparted greater metal-support interaction; whereas the coprecipitation impregnation catalysts only weakly interacted with the support. The CO2 temperature programmed desorption measurement of the reduced catalysts showed that urea hydrolysis catalysts possessed higher surface basicity as compared to coprecipitation catalysts. This high basic character aided in suppressing the coke formation. HRTEM results also revealed that urea hydrolysis produced smaller Ni0 particles (6–7 nm) and coprecipitation produced larger particles (10–20 nm). The excellent reforming properties of urea hydrolysis is due to smaller Ni0 particle size and greater surface basicity which aided in improving the catalytic performance and suppressing coke.
Shanmukapriya Jayaprakash; Nikita Dewangan; Ashok Jangam; Sonali Das; Sibudjing Kawi. LDH-derived Ni–MgO–Al2O3 catalysts for hydrogen-rich syngas production via steam reforming of biomass tar model: Effect of catalyst synthesis methods. International Journal of Hydrogen Energy 2021, 46, 18338 -18352.
AMA StyleShanmukapriya Jayaprakash, Nikita Dewangan, Ashok Jangam, Sonali Das, Sibudjing Kawi. LDH-derived Ni–MgO–Al2O3 catalysts for hydrogen-rich syngas production via steam reforming of biomass tar model: Effect of catalyst synthesis methods. International Journal of Hydrogen Energy. 2021; 46 (35):18338-18352.
Chicago/Turabian StyleShanmukapriya Jayaprakash; Nikita Dewangan; Ashok Jangam; Sonali Das; Sibudjing Kawi. 2021. "LDH-derived Ni–MgO–Al2O3 catalysts for hydrogen-rich syngas production via steam reforming of biomass tar model: Effect of catalyst synthesis methods." International Journal of Hydrogen Energy 46, no. 35: 18338-18352.
The greenhouse effect is leading to global warming and destruction of the ecological environment. The conversion of carbon dioxide and methane greenhouse gases into valuable substances has attracted scientists’ attentions. Dry reforming of methane (DRM) alleviates environmental problems and converts CO2 and CH4 into valuable chemical substances; however, due to the high energy input to break the strong chemical bonds in CO2 and CH4, non-thermal plasma (NTP) catalyzed DRM has been promising in activating CO2 at ambient conditions, thus greatly lowering the energy input; moreover, the synergistic effect of the catalyst and plasma improves the reaction efficiency. In this review, the recent developments of catalytic DRM in a dielectric barrier discharge (DBD) plasma reactor on Ni-based catalysts are summarized, including the concept, characteristics, generation, and types of NTP used for catalytic DRM and corresponding mechanisms, the synergy and performance of Ni-based catalysts with DBD plasma, the design of DBD reactor and process parameter optimization, and finally current challenges and future prospects are provided.
Xingyuan Gao; Ziting Lin; Tingting Li; Liuting Huang; JinMiao Zhang; Saeed Askari; Nikita Dewangan; Ashok Jangam; Sibudjing Kawi. Recent Developments in Dielectric Barrier Discharge Plasma-Assisted Catalytic Dry Reforming of Methane over Ni-Based Catalysts. Catalysts 2021, 11, 455 .
AMA StyleXingyuan Gao, Ziting Lin, Tingting Li, Liuting Huang, JinMiao Zhang, Saeed Askari, Nikita Dewangan, Ashok Jangam, Sibudjing Kawi. Recent Developments in Dielectric Barrier Discharge Plasma-Assisted Catalytic Dry Reforming of Methane over Ni-Based Catalysts. Catalysts. 2021; 11 (4):455.
Chicago/Turabian StyleXingyuan Gao; Ziting Lin; Tingting Li; Liuting Huang; JinMiao Zhang; Saeed Askari; Nikita Dewangan; Ashok Jangam; Sibudjing Kawi. 2021. "Recent Developments in Dielectric Barrier Discharge Plasma-Assisted Catalytic Dry Reforming of Methane over Ni-Based Catalysts." Catalysts 11, no. 4: 455.
Catalytic CO2 hydrogenation to methanol has become an interesting carbon dioxide utilization process because it provides a solution to the environmental greenhouse gas problem with an economic benefit. Cu-based catalysts have been widely studied for this process and perovskite structured materials emerged as an interesting alternative to conventional supported catalysts, due to its oxygen mobility property and structural feasibility in enhancing CO2 adsorption capacity by simple doping with alkali metal oxides. The role of CO2 adsorption strength in promoting CO2 hydrogenation to methanol activity was investigated over perovskite structure derived LaxSr1-xCu1.0O materials. Among all of the Sr-modified catalysts, La0.9Sr0.1CuO has achieved the best performance with respect to CO2 conversion (8.59%) and methanol selectivity (49%) at 300 °C and 3.0 MPa pressure. Furthermore, La0.9Sr0.1CuO also displayed a stable catalytic performance for the tested period of 24 h with no carbon formation during CO2 hydrogenation reaction. The formation of perovskite structures in calcined catalysts was confirmed by XRD analysis. XPS analysis revealed a higher amount of lattice oxygen species for reduced La0.9Sr0.1CuO than others. Moreover, a correlation between the amount of lattice oxygen and methanol yields indicates the crucial role of lattice oxygen species in promoting methanol selectivity during CO2 hydrogenation reaction. The role of oxygen lattice was further investigated using other characterization techniques such as H2-TPR, CO2/O2-TPD, N2O pulse, and XAS experiments. The in situ CO/(CO2+H2) DRIFTS further confirmed the contribution of lattice oxygen and basicity in methanol selectivity.
Antonius Jeffry Poerjoto; Jangam Ashok; Nikita Dewangan; Sibudjing Kawi. The role of lattice oxygen in CO2 hydrogenation to methanol over La1-xSrxCuO catalysts. Journal of CO2 Utilization 2021, 47, 101498 .
AMA StyleAntonius Jeffry Poerjoto, Jangam Ashok, Nikita Dewangan, Sibudjing Kawi. The role of lattice oxygen in CO2 hydrogenation to methanol over La1-xSrxCuO catalysts. Journal of CO2 Utilization. 2021; 47 ():101498.
Chicago/Turabian StyleAntonius Jeffry Poerjoto; Jangam Ashok; Nikita Dewangan; Sibudjing Kawi. 2021. "The role of lattice oxygen in CO2 hydrogenation to methanol over La1-xSrxCuO catalysts." Journal of CO2 Utilization 47, no. : 101498.
Sandwich structured core-shell [email protected]1-xZrxO2 catalysts with high coke resistance and activity are reported for DRM. Optimal Zr loading (x = 0.05 – 0.1) in the Ce1-xZrxO2 shell is observed to significantly increase the intrinsic activity for DRM. Extensive catalyst characterization using HRTEM, XRD, TPR, O2-TPD, XPS, EXAFS and CO pulse chemisorption indicates that the enhancement in DRM activity upon Zr doping can be attributed to the increase in lattice oxygen mobility of the ceria-zirconia shell and stronger metal-support interaction with Ni. It is inferred from a rigorous kinetic and mechanism study that the lattice oxygen of Ce1-xZrxO2 not only participates in the oxidation of carbonaceous reaction intermediates but also facilitates the rate determining step of C-H bond dissociation of CH4 on Ni by an oxygen-mediated dissociation pathway. The involvement of lattice oxygen in methane activation and dissociation manifests in the higher DRM activity of the Zr-doped catalyst with maximum oxygen storage capacity.
Sonali Dasa; Ashok Jangama; Shanmukapriya Jayaprakasha; Shibo Xib; Kus Hidajata; Keiichi Tomishigec; Sibudjing Kawia. Role of lattice oxygen in methane activation on [email protected] core-shell catalyst for methane dry reforming: Zr doping effect, mechanism, and kinetic study. Applied Catalysis B: Environmental 2021, 290, 119998 .
AMA StyleSonali Dasa, Ashok Jangama, Shanmukapriya Jayaprakasha, Shibo Xib, Kus Hidajata, Keiichi Tomishigec, Sibudjing Kawia. Role of lattice oxygen in methane activation on [email protected] core-shell catalyst for methane dry reforming: Zr doping effect, mechanism, and kinetic study. Applied Catalysis B: Environmental. 2021; 290 ():119998.
Chicago/Turabian StyleSonali Dasa; Ashok Jangama; Shanmukapriya Jayaprakasha; Shibo Xib; Kus Hidajata; Keiichi Tomishigec; Sibudjing Kawia. 2021. "Role of lattice oxygen in methane activation on [email protected] core-shell catalyst for methane dry reforming: Zr doping effect, mechanism, and kinetic study." Applied Catalysis B: Environmental 290, no. : 119998.