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

Authors
Gu, SangseoChoi, Jae-WookSuh, Dong JinYoo, Chun-JaeChoi, JungkyuHa, Jeong-Myeong
Issue Date
11월-2021
Publisher
MDPI
Keywords
biogas conversion; heterogeneous catalysts; high sulfur-compound resistance; tube-shaped catalyst pellets
Citation
CATALYSTS, v.11, no.11
Indexed
SCIE
SCOPUS
Journal Title
CATALYSTS
Volume
11
Number
11
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/135972
DOI
10.3390/catal11111301
ISSN
2073-4344
Abstract
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 O-2 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/Nm(3)) to 41.0 MJ/Nm(3) (OCM product mixture, Wobbe index = 54.2 MJ/Nm(3)), achieving the fuel standard prescribed in many countries (Wobbe index = 45.5-55.0 MJ/Nm(3)). The reaction parameters (temperature, gas hourly space velocity, size of the reaction system, and the CH4/O-2 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.
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공과대학 (화공생명공학과)
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