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Effects of bio‐syngas CO 2 concentration on water‐gas shift and side reactions with Fe‐Cr based catalyst
Author(s) -
Shin Jaeuk,
Kang Myung Soo,
Hwang Jungho
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5861
Subject(s) - water gas shift reaction , syngas , carbon monoxide , space velocity , chemistry , carbon dioxide , water gas , yield (engineering) , catalysis , hydrogen , steam reforming , inorganic chemistry , methane , chemical engineering , hydrogen production , materials science , organic chemistry , selectivity , metallurgy , engineering
Summary To increase the hydrogen (H 2 ) concentration in bio‐syngas containing carbon dioxide(CO 2 ), water‐gas shift reaction (WGSR) is widely used. In this study, the effects of CO 2 concentration on the WGSR and unwanted side reactions were investigated by varying the operating parameters, such as the steam/carbon monoxide (CO) ratio, reaction temperature, and the gas‐hourly space velocity (GHSV). Based on the obtained results, CO conversion and H 2 yield decreased with increasing CO 2 concentration, especially when the steam/CO ratio was lower than 3. This implies that to minimize the negative effect of CO 2 on WGSR, the steam/CO ratio should be 3 or higher. For any CO 2 concentration, the highest CO conversion and H 2 yield were obtained at a reaction temperature of 400°C. Therefore, the temperature should be precisely controlled at 400°C. As GHSV decreased, the CO conversion approached equilibrium with any CO 2 concentration; however, the H 2 yield remained unchanged.
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