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Thermodynamic analysis of sorption‐enhanced water–gas shift reaction using syngases
Author(s) -
Chein Reiyu,
Yu CT
Publication year - 2016
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.3554
Subject(s) - syngas , sorbent , sorption , adsorption , chemistry , gas composition , water gas shift reaction , chemical engineering , carbon fibers , carbon dioxide , activated carbon , co2 content , raw material , analytical chemistry (journal) , thermodynamics , catalysis , materials science , chromatography , organic chemistry , composite material , physics , composite number , engineering
Summary Sorption‐enhanced water–gas shift (SEWGS) reaction performance using syngas as the feedstock is investigated in this study based on thermodynamic equilibrium analysis. It was found that the capability of CO 2 sorbent in CO 2 removal was independent of the dry syngas composition. Regardless of the dry gas composition, CO 2 sorbent loses its adsorption capability as the reaction temperature increases higher than a temperature limit. This CO 2 adsorption temperature limit was found to depend on the steam to carbon (SC) ratio and reaction pressure. With the decrease in SC and increase in pressure the CO 2 adsorption temperature limit can be raised to a higher value. However, the initial CO 2 content in the syngas composition affects the carbon and CH 4 formations in SEWGS. For syngas with low CO 2 concentration, carbon formation can be completely eliminated and CH 4 formation can be reduced by CO 2 removal. For syngas with high CO 2 concentration, no carbon and CH 4 suppression can be found. It was also found that the temperature at which no carbon and CH 4 formations was increased to a higher value as the initial CO 2 concentration was increased. Copyright © 2016 John Wiley & Sons, Ltd.