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Article

Na2WO4/Mn/SiO2 Catalyst Pellets for Upgrading H2S-Containing Biogas via the Oxidative Coupling of Methane

1
Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea
2
Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea
3
Graduate School of Energy and Environment (Green School), Korea University, Seoul 02841, Korea
4
Division of Energy and Environment Technology, KIST School, Korea University of Science and Technology, Seoul 02792, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Joris W. Thybaut
Catalysts 2021, 11(11), 1301; https://doi.org/10.3390/catal11111301
Received: 6 October 2021 / Revised: 16 October 2021 / Accepted: 18 October 2021 / Published: 28 October 2021
Biogas is a promising renewable energy source; however, it needs to be upgraded to increase its low calorific value. In this study, oxidative coupling of methane (OCM) was selected to convert it to a higher fuel standard. Prior to establishing the scaled-up OCM process, the effect of organic/inorganic binders on catalytic activity was examined. The selection of the binders and composition of the catalyst pellet influenced the pore structure, fracture strength, and catalytic activity of the catalyst pellets. It was also observed that the O2 supply from the inorganic binder is a key factor in determining catalytic activity, based on which the composition of the catalyst pellets was optimized. The higher heating value increased from 39.9 (CH4, Wobbe index = 53.5 MJ/Nm3) to 41.0 MJ/Nm3 (OCM product mixture, Wobbe index = 54.2 MJ/Nm3), achieving the fuel standard prescribed in many countries (Wobbe index = 45.5–55.0 MJ/Nm3). The reaction parameters (temperature, gas hourly space velocity, size of the reaction system, and the CH4/O2 ratio) were also optimized, followed by a sensitivity analysis. Furthermore, the catalyst was stable for a long-term (100 h) operation under the optimized conditions. View Full-Text
Keywords: heterogeneous catalysts; biogas conversion; tube-shaped catalyst pellets; high sulfur-compound resistance heterogeneous catalysts; biogas conversion; tube-shaped catalyst pellets; high sulfur-compound resistance
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MDPI and ACS Style

Gu, S.; Choi, J.-W.; Suh, D.J.; Yoo, C.-J.; Choi, J.; Ha, J.-M. Na2WO4/Mn/SiO2 Catalyst Pellets for Upgrading H2S-Containing Biogas via the Oxidative Coupling of Methane. Catalysts 2021, 11, 1301. https://doi.org/10.3390/catal11111301

AMA Style

Gu S, Choi J-W, Suh DJ, Yoo C-J, Choi J, Ha J-M. Na2WO4/Mn/SiO2 Catalyst Pellets for Upgrading H2S-Containing Biogas via the Oxidative Coupling of Methane. Catalysts. 2021; 11(11):1301. https://doi.org/10.3390/catal11111301

Chicago/Turabian Style

Gu, Sangseo, Jae-Wook Choi, Dong J. Suh, Chun-Jae Yoo, Jungkyu Choi, and Jeong-Myeong Ha. 2021. "Na2WO4/Mn/SiO2 Catalyst Pellets for Upgrading H2S-Containing Biogas via the Oxidative Coupling of Methane" Catalysts 11, no. 11: 1301. https://doi.org/10.3390/catal11111301

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