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H2 recovery and CO2 capture after water–gas shift reactor using synthesis gas from coal gasification

Lee, Sung-Wook, Park, Jong-Soo, Lee, Chun-Boo, Lee, Dong-Wook, Kim, Hakjoo, Ra, Ho Won, Kim, Sung-Hyun, Ryi, Shin-Kun
Energy 2014 v.66 pp. 635-642
asymmetric membranes, carbon dioxide, carbon dioxide enrichment, catalysts, catalytic activity, chromium, coal, gasification, hydrogen, hydrogenation, nickel, stainless steel, synthesis gas
In this study, a combined test of the WGS (water–gas shift) reactor and a Pd-based composite membrane was carried out for pre-combustion CO2 capture in a coal gasifier. The two series of WGS reactions, i.e., a high-temperature shift and a low-temperature shift, were performed under a gas composition of 60% CO and 40% H2 at 2100 kPa to imitate coal gasification. The CO2 enrichment and H2 recovery tests at 673 K and 2100 kPa with the high-pressure membrane module after the WGS reaction presented the enriched CO2 concentration and H2 recovery ratios of ∼92% and ∼96%, respectively. The long-term stability test showed that the CO2 concentration decreased to 78.2%, and CO was generated and reached to 8.8% in the retentate stream after 47 h because of reverse WGS and CO2 hydrogenation reaction on 316L stainless steel module. The stability test for ∼3137 h showed that these catalytic activities could be successfully prevented using steel with higher Cr and Ni contents, such as 310S. The WGS-membrane combination test using the outlet gas from a real coal gasifier was continued for ∼100 h and showed that the WGS catalysts and membrane module made of 310S would be stable under real conditions.