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Nb promoter was introduced in the Co–CeO2 catalyst to improve its catalytic performance in the high temperature water gas shift (HT-WGS) reaction, which involves the production of hydrogen from waste-derived synthesis gas. Thereafter, the physicochemical properties of the promoter as well as those of the catalyst were investigated using various techniques. Thus, it was confirmed that the Nb promoter affects the key properties related to catalytic performance, including oxygen storage capacity (OSC) and dispersion. To maximize the positive effect of the Nb promoter, we further investigated the effect of the Nb loading amount on the performance of the catalyst. The results obtained showed that the 1.5NbCo catalyst exhibited the highest catalytic performance (XCO = 89% at 450 °C) under very severe conditions (gas hourly space velocity (GHSV) = 637,320 h−1). Additionally, this catalyst exhibited stable activity for 50 h. This its high catalytic performance could be attributed to its high OSC and Co dispersion. Therefore, it is a promising catalyst for hydrogen production via the HT-WGS reaction.
Chang-Hoon Jeong; Kyung-Won Jeon; Hui-Ju Byeon; Tae-Yeol Choi; Hak-Min Kim; Dae-Woon Jeong. Effects of niobium addition on active metal and support in Co–CeO2 catalyst for the high temperature water gas shift reaction. Journal of Industrial and Engineering Chemistry 2021, 100, 149 -158.
AMA StyleChang-Hoon Jeong, Kyung-Won Jeon, Hui-Ju Byeon, Tae-Yeol Choi, Hak-Min Kim, Dae-Woon Jeong. Effects of niobium addition on active metal and support in Co–CeO2 catalyst for the high temperature water gas shift reaction. Journal of Industrial and Engineering Chemistry. 2021; 100 ():149-158.
Chicago/Turabian StyleChang-Hoon Jeong; Kyung-Won Jeon; Hui-Ju Byeon; Tae-Yeol Choi; Hak-Min Kim; Dae-Woon Jeong. 2021. "Effects of niobium addition on active metal and support in Co–CeO2 catalyst for the high temperature water gas shift reaction." Journal of Industrial and Engineering Chemistry 100, no. : 149-158.
The catalysts used to facilitate the water gas shift reaction (WGSR) are generally harmful to the environment. Therefore, catalysts that have high activity and stability in WGSR and do not pollute the environment need to be fabricated. Herein, three promoters (La, Pr, and Zr) are added into Co–CeO2 (CoCe) catalyst to improve catalytic performance in a high temperature WGSR to produce high-purity hydrogen from waste-derived synthesis gas. Various techniques are employed to confirm the changes in the properties that affect the catalytic performance. The catalytic reaction is performed at a high gas hourly space velocity to screen the performance of the promoted CoCe catalysts. The CoCeZr catalyst shows the highest CO conversion (XCO = 88% at 450 °C) due to its high Co dispersion and oxygen vacancy resulting from the addition of Zr to the CoCe catalyst; thus, it is most suitable for use in high temperature WGSR.
Ju-Hwan Kim; Jee-Eun Kim; Hak-Min Kim; Dae-Woon Jeong. Characteristics and performance of the Co–CeO2 catalyst as a function of the promoter (La, Pr, and Zr) used in high temperature water gas shift reaction. International Journal of Hydrogen Energy 2021, 46, 12981 -12991.
AMA StyleJu-Hwan Kim, Jee-Eun Kim, Hak-Min Kim, Dae-Woon Jeong. Characteristics and performance of the Co–CeO2 catalyst as a function of the promoter (La, Pr, and Zr) used in high temperature water gas shift reaction. International Journal of Hydrogen Energy. 2021; 46 (24):12981-12991.
Chicago/Turabian StyleJu-Hwan Kim; Jee-Eun Kim; Hak-Min Kim; Dae-Woon Jeong. 2021. "Characteristics and performance of the Co–CeO2 catalyst as a function of the promoter (La, Pr, and Zr) used in high temperature water gas shift reaction." International Journal of Hydrogen Energy 46, no. 24: 12981-12991.
Yong-Hee Lee; Chang-Hoon Jeong; Hong-Deok Jin; Yun-Jeong Gu; Hui-Ju Byeon; Hak-Min Kim; Dae-Woon Jeong. A Study on the Optimization of Fast Pyrolysis System and Deoxygenation for Bio-oil Production of Unused Agricultural By-products. Journal of Korea Society of Waste Management 2020, 37, 531 -541.
AMA StyleYong-Hee Lee, Chang-Hoon Jeong, Hong-Deok Jin, Yun-Jeong Gu, Hui-Ju Byeon, Hak-Min Kim, Dae-Woon Jeong. A Study on the Optimization of Fast Pyrolysis System and Deoxygenation for Bio-oil Production of Unused Agricultural By-products. Journal of Korea Society of Waste Management. 2020; 37 (08):531-541.
Chicago/Turabian StyleYong-Hee Lee; Chang-Hoon Jeong; Hong-Deok Jin; Yun-Jeong Gu; Hui-Ju Byeon; Hak-Min Kim; Dae-Woon Jeong. 2020. "A Study on the Optimization of Fast Pyrolysis System and Deoxygenation for Bio-oil Production of Unused Agricultural By-products." Journal of Korea Society of Waste Management 37, no. 08: 531-541.
To construct a system for the effective hydrogen production from food waste, the conditions of anaerobic digestion and biogas reforming have been investigated and optimized. The type of agitator and reactor shape affect the performance of anaerobic digestion reactors. Reactors with a cubical shape and hydrofoil agitator exhibit high performance due to the enhanced axial flow and turbulence as confirmed by simulation of computational fluid dynamics. The stability of an optimized anaerobic digestion reactor has been tested for 60 days. As a result, 84 L of biogas is produced from 1 kg of food waste. Reaction conditions, such as reaction temperature and steam/methane ratio, affect the biogas steam reforming reaction. The reactant conversions, product yields, and hydrogen production are influenced by reaction conditions. The optimized reaction conditions include a reaction temperature of 700 °C and H2O/CH4 ratio of 1.0. Under these conditions, hydrogen can be produced via steam reforming of biogas generated from a two-stage anaerobic digestion reactor for 25 h without significant deactivation and fluctuation.
Min-Ju Park; Ju-Hwan Kim; Yong-Hee Lee; Hak-Min Kim; Dae-Woon Jeong. System optimization for effective hydrogen production via anaerobic digestion and biogas steam reforming. International Journal of Hydrogen Energy 2020, 45, 30188 -30200.
AMA StyleMin-Ju Park, Ju-Hwan Kim, Yong-Hee Lee, Hak-Min Kim, Dae-Woon Jeong. System optimization for effective hydrogen production via anaerobic digestion and biogas steam reforming. International Journal of Hydrogen Energy. 2020; 45 (55):30188-30200.
Chicago/Turabian StyleMin-Ju Park; Ju-Hwan Kim; Yong-Hee Lee; Hak-Min Kim; Dae-Woon Jeong. 2020. "System optimization for effective hydrogen production via anaerobic digestion and biogas steam reforming." International Journal of Hydrogen Energy 45, no. 55: 30188-30200.
CeO2 supports have been synthesized through a different precipitation/digestion method with various cerium precursors (cerium hydroxide (CH), cerium hydroxy carbonate (CHC), cerium carbonate (CC)). Nano-sized CeO2 supports with a high BET surface area were prepared through the pre-calcination of cerium precursors. 20 wt.% of Cu was loaded onto the prepared CeO2 supports through an incipient wetness impregnation method. Among the prepared catalysts, Cu/CeO2-CHC yielded the highest CO conversion between the temperature range from 200 to 360 °C. This result was primarily due to possessing the highest Cu dispersion and a high oxygen storage capacity (OSC). In addition, the 20 wt.% Cu/CeO2 catalyst exhibited 100% CO2 selectivity.
Yun-Jeong Gu; Ju-Hwan Kim; Won-Jun Jang; Dae-Woon Jeong. A comparison of Cu/CeO2 catalysts prepared via different precipitants/digestion methods for single stage water gas shift reactions. Catalysis Today 2020, 1 .
AMA StyleYun-Jeong Gu, Ju-Hwan Kim, Won-Jun Jang, Dae-Woon Jeong. A comparison of Cu/CeO2 catalysts prepared via different precipitants/digestion methods for single stage water gas shift reactions. Catalysis Today. 2020; ():1.
Chicago/Turabian StyleYun-Jeong Gu; Ju-Hwan Kim; Won-Jun Jang; Dae-Woon Jeong. 2020. "A comparison of Cu/CeO2 catalysts prepared via different precipitants/digestion methods for single stage water gas shift reactions." Catalysis Today , no. : 1.
Objectives:Bioethanol is known as an important energy source that comes from plants, uses existing energy infrastructure without additional investment, and emits a low concentration of pollutants during combustion as eco-friendly renewable energy. Microalgae is reported as an effective material for producing bioethanol because of rapid biomass growth and relatively easy pretreatment steps. The objectives of this study are 1) to introduce general information of bioethanol production, 2) to show various processes for bioethanol production from microalgae, and 3) to provide an economic perspective of bioethanol. Methods:Recent published peer-reviewed papers were collected and analyzed. The contents follow the order: 1) introduction, 2) general information about microalgae for bioethanol production, 3) bioethanol producing processes, 4) economic feasibility, and 5) conclusion.Results and Discussion:The selection of the microalgae species and growing method are important to obtain high yield bioethanol. Physical, chemical, biological pretreatment was introduced. Also, comparison of the bioethanol producing processes was provided. Conclusions:Bioethanol production from microalgae is a promising energy source because microalgae have lots of advantages as effective biomass such as rapid growth, high polysaccharide contents, and easy preparing step for bioethanol production. However, it has some limitations that need to overcome. Algae growing method, pretreatment technology, and fermentation steps still require advanced technology, which can improve economic feasibility.
Jongkwan Park; Hansol Mun; Min-Ju Park; Heewon Jang; Dae-Woon Jeong. Bioethanol Production Using Microalgae. Journal of Korean Society of Environmental Engineers 2020, 42, 164 -176.
AMA StyleJongkwan Park, Hansol Mun, Min-Ju Park, Heewon Jang, Dae-Woon Jeong. Bioethanol Production Using Microalgae. Journal of Korean Society of Environmental Engineers. 2020; 42 (3):164-176.
Chicago/Turabian StyleJongkwan Park; Hansol Mun; Min-Ju Park; Heewon Jang; Dae-Woon Jeong. 2020. "Bioethanol Production Using Microalgae." Journal of Korean Society of Environmental Engineers 42, no. 3: 164-176.
The effect of Nb promotion over a Cu–CeO2 catalyst was investigated in the low-temperature water gas shift reaction. The Nb loading amount was systematically varied from 0 to 5 wt% for the Cu–Nb–CeO2 catalyst, and the 1 wt% Nb promoted Cu–Nb–CeO2 catalyst exhibited the highest catalytic performance even at extremely high GHSV of 72,152 h−1. The catalysts were characterized through various techniques such as Brunauer-Emmet-Teller measurements, X-ray diffraction, N2O-chemisorption, H2-temperature programmed reduction, X-ray photoelectron spectroscopy, and transmission electron microscopy. It was found that the superior performance of the 1 wt% Nb promoted Cu–Nb–CeO2 catalyst was due to its enhanced reducibility, high BET surface area, small metallic Cu crystallite size, and high number of oxygen vacancies.
Chang-Hoon Jeong; Hui-Ju Byeon; Won-Jun Jang; Kyung-Won Jeon; Dae-Woon Jeong. The optimization of Nb loading amount over Cu–Nb–CeO2 catalysts for hydrogen production via the low-temperature water gas shift reaction. International Journal of Hydrogen Energy 2020, 45, 9648 -9657.
AMA StyleChang-Hoon Jeong, Hui-Ju Byeon, Won-Jun Jang, Kyung-Won Jeon, Dae-Woon Jeong. The optimization of Nb loading amount over Cu–Nb–CeO2 catalysts for hydrogen production via the low-temperature water gas shift reaction. International Journal of Hydrogen Energy. 2020; 45 (16):9648-9657.
Chicago/Turabian StyleChang-Hoon Jeong; Hui-Ju Byeon; Won-Jun Jang; Kyung-Won Jeon; Dae-Woon Jeong. 2020. "The optimization of Nb loading amount over Cu–Nb–CeO2 catalysts for hydrogen production via the low-temperature water gas shift reaction." International Journal of Hydrogen Energy 45, no. 16: 9648-9657.
Min-Ju Park; Won-Jun Jang; Dae-Woon Jeong. A Study for Production of Biogas from Two-phase Anaerobic Digestion Process and Hydrogen from Reforming Reaction of Biogas. Journal of Korea Society of Waste Management 2020, 37, 51 -61.
AMA StyleMin-Ju Park, Won-Jun Jang, Dae-Woon Jeong. A Study for Production of Biogas from Two-phase Anaerobic Digestion Process and Hydrogen from Reforming Reaction of Biogas. Journal of Korea Society of Waste Management. 2020; 37 (1):51-61.
Chicago/Turabian StyleMin-Ju Park; Won-Jun Jang; Dae-Woon Jeong. 2020. "A Study for Production of Biogas from Two-phase Anaerobic Digestion Process and Hydrogen from Reforming Reaction of Biogas." Journal of Korea Society of Waste Management 37, no. 1: 51-61.
Ni-loaded Ce0.6Zr0.4O2 catalysts were prepared by a co-precipitation method and subsequently employed in the deoxygenation of oleic acid under solvent-free conditions. Among the prepared catalysts, the 20 wt% Ni-Ce0.6Zr0.4O2 catalyst exhibited the highest catalytic activity, i.e., 98.3% oleic acid conversion, with 33.9% C9-C17 selectivity, and a 95.7% oxygen removal rate. The basic fuel properties of the obtained products were then examined to determine their potential for use in a diesel engine. The product produced using the 20 wt% Ni-Ce0.6Zr0.4O2 catalyst exhibited a particularly high calorific value (i.e., 10213 cal/g, similar to that of commercial diesel, i.e., 10220 cal/g), the lowest viscosity (25.2cP), and the lowest solidification temperature (−15 °C).
Kyung-Won Jeon; Hyun-Suk Na; Yeol-Lim Lee; Seon-Yong Ahn; Kyoung-Jin Kim; Jae-Oh Shim; Won-Jun Jang; Dae-Woon Jeong; In Wook Nah; Hyun-Seog Roh. Catalytic deoxygenation of oleic acid over a Ni-CeZrO2 catalyst. Fuel 2019, 258, 116179 .
AMA StyleKyung-Won Jeon, Hyun-Suk Na, Yeol-Lim Lee, Seon-Yong Ahn, Kyoung-Jin Kim, Jae-Oh Shim, Won-Jun Jang, Dae-Woon Jeong, In Wook Nah, Hyun-Seog Roh. Catalytic deoxygenation of oleic acid over a Ni-CeZrO2 catalyst. Fuel. 2019; 258 ():116179.
Chicago/Turabian StyleKyung-Won Jeon; Hyun-Suk Na; Yeol-Lim Lee; Seon-Yong Ahn; Kyoung-Jin Kim; Jae-Oh Shim; Won-Jun Jang; Dae-Woon Jeong; In Wook Nah; Hyun-Seog Roh. 2019. "Catalytic deoxygenation of oleic acid over a Ni-CeZrO2 catalyst." Fuel 258, no. : 116179.
Herein, we have prepared a series of Cr-free Fe-Al-Cu catalysts by the homogeneous one-step co-precipitation method and examined their ability to promote the water gas shift (WGS) reaction and thus facilitate the production of hydrogen from waste-derived synthesis gas. The prepared catalysts are confirmed to possess γ-Fe2O3, which can be more easily transformed into Fe3O4 than α-Fe2O3. The surface area, Fe3O4 crystallite size, reducibility, and Cu dispersion of these catalysts significantly depend on the concentrations of metal precursor. The catalysts effectively promote the WGS reaction without facilitating undesirable side reactions, achieving efficient hydrogen production and high CO conversion. The characteristics of the best-performing sample are preserved when the production is scaled up by a factor of 40 and thus obtained large-scale Fe-Al-Cu catalyst exhibits excellent reducibility and high CO conversion. Both commercial Fe-Cr and large-scale Fe-Al-Cu catalysts achieve close-to-equilibrium CO conversions at a gas hourly space velocity (GHSV) of 3,000 mL·g−1 h−1, but the latter showed a higher conversion than the former at a GHSV of 40,057 mL·g−1 h−1 owing to the promotional effect of Cu on the easier reducibility of Fe species and the formation of additional Cu active sites. Thus, we demonstrate the possibility of finding Cr-free alternatives and show that the reducibility, Fe3O4 crystallite size, and Cu dispersion of the best-performing catalyst could be maintained upon upscaling, which made this catalyst well suited for converting waste-derived synthesis gas into H2.
Won-Jun Jang; Jae-Oh Shim; Kyung-Won Jeon; Hyun-Suk Na; Hak-Min Kim; Yeol-Lim Lee; Hyun-Seog Roh; Dae-Woon Jeong. Design and scale-up of a Cr-free Fe-Al-Cu catalyst for hydrogen production from waste-derived synthesis gas. Applied Catalysis B: Environmental 2019, 249, 72 -81.
AMA StyleWon-Jun Jang, Jae-Oh Shim, Kyung-Won Jeon, Hyun-Suk Na, Hak-Min Kim, Yeol-Lim Lee, Hyun-Seog Roh, Dae-Woon Jeong. Design and scale-up of a Cr-free Fe-Al-Cu catalyst for hydrogen production from waste-derived synthesis gas. Applied Catalysis B: Environmental. 2019; 249 ():72-81.
Chicago/Turabian StyleWon-Jun Jang; Jae-Oh Shim; Kyung-Won Jeon; Hyun-Suk Na; Hak-Min Kim; Yeol-Lim Lee; Hyun-Seog Roh; Dae-Woon Jeong. 2019. "Design and scale-up of a Cr-free Fe-Al-Cu catalyst for hydrogen production from waste-derived synthesis gas." Applied Catalysis B: Environmental 249, no. : 72-81.
Support- and sulfide-free cobalt molybdenum catalysts are prepared via different synthetic procedures for catalytic deoxygenation of oleic acid under inert (N2) and solvent-free conditions. Among the tested catalysts, the CoMo catalyst prepared via a sol-gel method achieves the highest catalytic performance, namely, 88.9% oleic acid conversion, with 48.1% C9–C17 selectivity, and 69.6% oxygen removal rate, owing to its excellent physical properties. Additionally, oxygen vacancy is formed in CoMo catalyst during sol-gel synthesis process and it also effect on the catalytic activity. Examination of the deoxygenation reaction over pre-reduced catalysts reveals that the CoMoO4 species is the active species in the CoMo catalysts. The fuel properties of the resultant products are affected strongly by the catalytic performances of the CoMo catalysts. The biofuel produced using the CoMo catalyst prepared via the sol-gel method showed the highest calorific value (10,119 cal/g) and the lowest viscosity (31.5 cP), and, consequently, this CoMo catalyst exhibits the highest catalytic activity and has significant potential for application in biofuel production.
Jae-Oh Shim; Kyung-Won Jeon; Won-Jun Jang; Hyun-Suk Na; Jae-Wan Cho; Hak-Min Kim; Yeol-Lim Lee; Dae-Woon Jeong; Hyun-Seog Roh; Chang Hyun Ko. Facile production of biofuel via solvent-free deoxygenation of oleic acid using a CoMo catalyst. Applied Catalysis B: Environmental 2018, 239, 644 -653.
AMA StyleJae-Oh Shim, Kyung-Won Jeon, Won-Jun Jang, Hyun-Suk Na, Jae-Wan Cho, Hak-Min Kim, Yeol-Lim Lee, Dae-Woon Jeong, Hyun-Seog Roh, Chang Hyun Ko. Facile production of biofuel via solvent-free deoxygenation of oleic acid using a CoMo catalyst. Applied Catalysis B: Environmental. 2018; 239 ():644-653.
Chicago/Turabian StyleJae-Oh Shim; Kyung-Won Jeon; Won-Jun Jang; Hyun-Suk Na; Jae-Wan Cho; Hak-Min Kim; Yeol-Lim Lee; Dae-Woon Jeong; Hyun-Seog Roh; Chang Hyun Ko. 2018. "Facile production of biofuel via solvent-free deoxygenation of oleic acid using a CoMo catalyst." Applied Catalysis B: Environmental 239, no. : 644-653.
Currently, the ozone (O3) oxidation efficiency in the treatment of waste soy sauce provides 34.2% color removal and a 27.4% reduction in its chemical oxygen demand (COD). To improve the O3 oxidation efficiency, hydrogen peroxide (H2O2) is used to cause a H2O2/O3 process. In H2O2/O3 process experiments, a previously optimized pH of 11 and applied O3 dose of 50 mg L−1 were used and the H2O2/O3 ratio was varied between 0.1 and 0.9 in intervals of 0.2. The results show that an H2O2/O3 ratio of 0.3 results in the highest efficiencies in terms of color removal (51.6%) and COD reduction (33.8%). Nanofiltration (NF) was used to pretreat the waste soy sauce to improve color removal and COD reduction. The results showed that NF with an NE-70 membrane results in 80.8% color removal and 79.6% COD reduction. Finally, the combination of NF and H2O2/O3 process resulted in the best treatment efficiency: 98.1% color removal and 98.2% COD reduction. Thus, NF & H2O2/O3 process can be considered as one of the best treatment methods for waste soy sauce, which requires high intrinsic color removal and COD reduction efficiencies.
Hyun-Hee Jang; Gyu-Tae Seo; Dae-Woon Jeong. Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce. Sustainability 2018, 10, 2929 .
AMA StyleHyun-Hee Jang, Gyu-Tae Seo, Dae-Woon Jeong. Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce. Sustainability. 2018; 10 (8):2929.
Chicago/Turabian StyleHyun-Hee Jang; Gyu-Tae Seo; Dae-Woon Jeong. 2018. "Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce." Sustainability 10, no. 8: 2929.
Won-Jun Jang; Hyun-Seog Roh; Dae-Woon Jeong. An important factor for the water gas shift reaction activity of Cu-loaded cubic Ce0.8Zr0.2O2 catalysts. Environmental Engineering Research 2018, 23, 339 -344.
AMA StyleWon-Jun Jang, Hyun-Seog Roh, Dae-Woon Jeong. An important factor for the water gas shift reaction activity of Cu-loaded cubic Ce0.8Zr0.2O2 catalysts. Environmental Engineering Research. 2018; 23 (3):339-344.
Chicago/Turabian StyleWon-Jun Jang; Hyun-Seog Roh; Dae-Woon Jeong. 2018. "An important factor for the water gas shift reaction activity of Cu-loaded cubic Ce0.8Zr0.2O2 catalysts." Environmental Engineering Research 23, no. 3: 339-344.
The size of Ni particles and the oxygen storage capacity are found to be the primary and secondary key factors that influence the catalytic performance, respectively.
Won-Jun Jang; Hak-Min Kim; Jae-Oh Shim; Seong-Yeun Yoo; Kyung-Won Jeon; Hyun-Suk Na; Yeol-Lim Lee; Dae-Woon Jeong; Jong Wook Bae; In Wook Nah; Hyun-Seog Roh. Key properties of Ni–MgO–CeO2, Ni–MgO–ZrO2, and Ni–MgO–Ce(1−x)Zr(x)O2catalysts for the reforming of methane with carbon dioxide. Green Chemistry 2018, 20, 1621 -1633.
AMA StyleWon-Jun Jang, Hak-Min Kim, Jae-Oh Shim, Seong-Yeun Yoo, Kyung-Won Jeon, Hyun-Suk Na, Yeol-Lim Lee, Dae-Woon Jeong, Jong Wook Bae, In Wook Nah, Hyun-Seog Roh. Key properties of Ni–MgO–CeO2, Ni–MgO–ZrO2, and Ni–MgO–Ce(1−x)Zr(x)O2catalysts for the reforming of methane with carbon dioxide. Green Chemistry. 2018; 20 (7):1621-1633.
Chicago/Turabian StyleWon-Jun Jang; Hak-Min Kim; Jae-Oh Shim; Seong-Yeun Yoo; Kyung-Won Jeon; Hyun-Suk Na; Yeol-Lim Lee; Dae-Woon Jeong; Jong Wook Bae; In Wook Nah; Hyun-Seog Roh. 2018. "Key properties of Ni–MgO–CeO2, Ni–MgO–ZrO2, and Ni–MgO–Ce(1−x)Zr(x)O2catalysts for the reforming of methane with carbon dioxide." Green Chemistry 20, no. 7: 1621-1633.
To obtain a suitable oxidation method for removing the color and lowering the chemical oxygen demand (COD) of waste soy sauce, Fenton (Fe2+), Fenton-like (Fe3+), and ozone (O3) oxidation methods are used as the target reactions. In experimental conditions for Fenton oxidation, the dose of Fe2+ and Fe3+ was varied between 100 mg/L and 300 mg/L. The dose of hydrogen peroxide for the reaction was injected from 100–1000 mg/L. For ozone oxidation, the pH was increased from 3 to 14 and the O3-containing gas was supplied continuously for 30 min through a gas diffuser at the bottom of the reactor at different applied O3 doses (10–90 mg/L). We subjected it to a simple 1:20 dilution with deionized water to identify the comparison result in detail. O3 oxidation shows the highest efficiencies of color removal (81.1%) and COD lowering (64.9%) among the three oxidation methods. This is mainly due to the fact that it has a relatively large amount of hydroxyl radical, resulting in the degradation of organics. Thus, O3 oxidation could be a promising method for removing the color and lowering the COD of waste soy sauce. The critical parameters (pH and applied O3 dose) were varied systematically to optimize O3 oxidation. It was found that the optimum pH and applied O3 dose are 11.0 mg /L and 50.0 mg /L, respectively (color removal = 34.2%, COD removal = 27.4%).
Hyun-Hee Jang; Gyu-Tae Seo; Dae-Woon Jeong. Investigation of Oxidation Methods for Waste Soy Sauce Treatment. International Journal of Environmental Research and Public Health 2017, 14, 1190 .
AMA StyleHyun-Hee Jang, Gyu-Tae Seo, Dae-Woon Jeong. Investigation of Oxidation Methods for Waste Soy Sauce Treatment. International Journal of Environmental Research and Public Health. 2017; 14 (10):1190.
Chicago/Turabian StyleHyun-Hee Jang; Gyu-Tae Seo; Dae-Woon Jeong. 2017. "Investigation of Oxidation Methods for Waste Soy Sauce Treatment." International Journal of Environmental Research and Public Health 14, no. 10: 1190.
Ajay Jha; Yeol-Lim Lee; Won-Jun Jang; Jae-Oh Shim; Kyung-Won Jeon; Hyun-Suk Na; Hak-Min Kim; Hyun-Seog Roh; Dae-Woon Jeong; Sang Goo Jeon; Jeong-Geol Na; Wang Lai Yoon. Effect of the redox properties of support oxide over cobalt-based catalysts in high temperature water-gas shift reaction. Molecular Catalysis 2017, 433, 145 -152.
AMA StyleAjay Jha, Yeol-Lim Lee, Won-Jun Jang, Jae-Oh Shim, Kyung-Won Jeon, Hyun-Suk Na, Hak-Min Kim, Hyun-Seog Roh, Dae-Woon Jeong, Sang Goo Jeon, Jeong-Geol Na, Wang Lai Yoon. Effect of the redox properties of support oxide over cobalt-based catalysts in high temperature water-gas shift reaction. Molecular Catalysis. 2017; 433 ():145-152.
Chicago/Turabian StyleAjay Jha; Yeol-Lim Lee; Won-Jun Jang; Jae-Oh Shim; Kyung-Won Jeon; Hyun-Suk Na; Hak-Min Kim; Hyun-Seog Roh; Dae-Woon Jeong; Sang Goo Jeon; Jeong-Geol Na; Wang Lai Yoon. 2017. "Effect of the redox properties of support oxide over cobalt-based catalysts in high temperature water-gas shift reaction." Molecular Catalysis 433, no. : 145-152.
To investigate the effect of preparation method on the CeO2-promoted Cu/γ-Al2O3 catalyst for the high-temperature water gas shift reaction over simulated waste-derived synthesis gas, Ce/Cu/γ-Al2O3, Ce-Cu/γ-Al2O3, Cu/Ce/γ-Al2O3, and Cu/γ-Al2O3 catalysts were applied to the target reaction. Among the prepared catalysts, Ce/Cu/γ-Al2O3 showed the highest activity due to its high oxygen vacancy concentration and large amount of reduced Cu species, supported by XPS, Raman, and PL analysis. Additionally, TPR results showed that the catalyst preparation method effected the transformation of bulk CuO species to highly dispersed Cu-species, which influenced the catalyst activity.
Jae-Oh Shim; Hyun-Suk Na; Ajay Jha; Won-Jun Jang; Dae-Woon Jeong; In Wook Nah; Byong-Hun Jeon; Hyun-Seog Roh. Effect of preparation method on the oxygen vacancy concentration of CeO 2 -promoted Cu/γ-Al 2 O 3 catalysts for HTS reactions. Chemical Engineering Journal 2016, 306, 908 -915.
AMA StyleJae-Oh Shim, Hyun-Suk Na, Ajay Jha, Won-Jun Jang, Dae-Woon Jeong, In Wook Nah, Byong-Hun Jeon, Hyun-Seog Roh. Effect of preparation method on the oxygen vacancy concentration of CeO 2 -promoted Cu/γ-Al 2 O 3 catalysts for HTS reactions. Chemical Engineering Journal. 2016; 306 ():908-915.
Chicago/Turabian StyleJae-Oh Shim; Hyun-Suk Na; Ajay Jha; Won-Jun Jang; Dae-Woon Jeong; In Wook Nah; Byong-Hun Jeon; Hyun-Seog Roh. 2016. "Effect of preparation method on the oxygen vacancy concentration of CeO 2 -promoted Cu/γ-Al 2 O 3 catalysts for HTS reactions." Chemical Engineering Journal 306, no. : 908-915.
Thermodynamic equilibrium analysis of the combined steam and carbon dioxide reforming of methane (CSCRM) and side reactions was performed using total Gibbs free energy minimization. The effects of (CO2 + H2O)/CH4 ratio (0.9–2.9), CO2:H2O ratio (3:1–1:3), and temperature (500–1000 °C) on the equilibrium conversions, yields, coke yield, and H2/CO ratio were investigated. A (CO2 + H2O)/CH4 ratio greater than 1.2, a CO2:H2O ratio of 1:2.1, and a temperature of at least 850 °C are preferable reaction conditions for the synthesis gas preparation in the gas to liquid process. Simulated conditions were applied to the CSCRM reaction and the experimental data were compared with the thermodynamic equilibrium results. The thermodynamic equilibrium results were mostly consistent with the experimental data, but the reverse water gas shift reaction rapidly occurred in the real chemical reaction and under excess oxidizing agent conditions. In addition, a long-term stability test (under simulated conditions) showed that the equilibrium conversion was maintained for 500 h and that the coke formation on the used catalyst was not observed.
Won-Jun Jang; Dae-Woon Jeong; Jae-Oh Shim; Hak-Min Kim; Hyun-Seog Roh; In Hyuk Son; Seung Jae Lee. Combined steam and carbon dioxide reforming of methane and side reactions: Thermodynamic equilibrium analysis and experimental application. Applied Energy 2016, 173, 80 -91.
AMA StyleWon-Jun Jang, Dae-Woon Jeong, Jae-Oh Shim, Hak-Min Kim, Hyun-Seog Roh, In Hyuk Son, Seung Jae Lee. Combined steam and carbon dioxide reforming of methane and side reactions: Thermodynamic equilibrium analysis and experimental application. Applied Energy. 2016; 173 ():80-91.
Chicago/Turabian StyleWon-Jun Jang; Dae-Woon Jeong; Jae-Oh Shim; Hak-Min Kim; Hyun-Seog Roh; In Hyuk Son; Seung Jae Lee. 2016. "Combined steam and carbon dioxide reforming of methane and side reactions: Thermodynamic equilibrium analysis and experimental application." Applied Energy 173, no. : 80-91.
Ajay Jha; Dae-Woon Jeong; Yeol-Lim Lee; Won-Jun Jang; Jae-Oh Shim; Kyung-Won Jeon; Chandrashekhar V. Rode; Hyun-Seog Roh. Chromium free high temperature water–gas shift catalyst for the production of hydrogen from waste derived synthesis gas. Applied Catalysis A: General 2016, 522, 21 -31.
AMA StyleAjay Jha, Dae-Woon Jeong, Yeol-Lim Lee, Won-Jun Jang, Jae-Oh Shim, Kyung-Won Jeon, Chandrashekhar V. Rode, Hyun-Seog Roh. Chromium free high temperature water–gas shift catalyst for the production of hydrogen from waste derived synthesis gas. Applied Catalysis A: General. 2016; 522 ():21-31.
Chicago/Turabian StyleAjay Jha; Dae-Woon Jeong; Yeol-Lim Lee; Won-Jun Jang; Jae-Oh Shim; Kyung-Won Jeon; Chandrashekhar V. Rode; Hyun-Seog Roh. 2016. "Chromium free high temperature water–gas shift catalyst for the production of hydrogen from waste derived synthesis gas." Applied Catalysis A: General 522, no. : 21-31.
In this study, we report an investigation of the low temperature water–gas shift (LT-WGS) reaction over a series of non-noble metal doped (Me = Mn, Fe, Co, and Ni) mesoporous Co3O4 catalysts.
Hyun-Suk Na; Chang-Il Ahn; Ajay Jha; Kyung Soo Park; Won-Jun Jang; Jae-Oh Shim; Dae-Woon Jeong; Hyun-Seog Roh; Jong Wook Bae. The investigation of non-noble metal doped mesoporous cobalt oxide catalysts for the water–gas shift reaction. RSC Advances 2016, 6, 52754 -52760.
AMA StyleHyun-Suk Na, Chang-Il Ahn, Ajay Jha, Kyung Soo Park, Won-Jun Jang, Jae-Oh Shim, Dae-Woon Jeong, Hyun-Seog Roh, Jong Wook Bae. The investigation of non-noble metal doped mesoporous cobalt oxide catalysts for the water–gas shift reaction. RSC Advances. 2016; 6 (58):52754-52760.
Chicago/Turabian StyleHyun-Suk Na; Chang-Il Ahn; Ajay Jha; Kyung Soo Park; Won-Jun Jang; Jae-Oh Shim; Dae-Woon Jeong; Hyun-Seog Roh; Jong Wook Bae. 2016. "The investigation of non-noble metal doped mesoporous cobalt oxide catalysts for the water–gas shift reaction." RSC Advances 6, no. 58: 52754-52760.