Integrated gasification combined cycle with CO2 capture and sequestration (IGCC-CCS) emerges as a promising method for achieving higher energy efficiency and better emission control compared with the traditional pulverized coal plant. But the current CCS technology, especially the commercially-available solvent-based CO2 capture process is energy intensive which makes the IGCC process unaffordable. To achieve DOE's goal concerning IGCC-CCS, which requires a 90% CO2 capture with less than 10% increase in cost of electricity, some energy-efficient capture process needs to be developed. Recent research conducted in our group indicates that a warm CO2 capture process based on solid sorbent can potentially improve the efficiency of IGCC compared with the solvent-based CO2 capture process. This motivates our investigation of proper sorbent material for warm CO2 capture.In this work, we present a sorbent material which could be potentially used for warm CO2 capture in IGCC process. The sorbent material was synthesized using incipient wetness impregnation method. Its sorption behavior under various temperature and pressure were studied in a high-pressure microbalance and a thermogravimetric analyzer.  Long time cycle tests and comparisons with competitive sorbent materials were also conducted. The results indicate the sorbent has a stable working capacity when operating in the 180 ~ 240 �C temperature range. It has good working capacity, fast kinetics and low heat of adsorption. Compared with the widely studied mixed oxides and K2CO3-promoted hydrotalcite, the material has relative advantage in capacity and kinetics. In addition, a pressure swing adsorption (PSA) process based on the real sorbent data is also established. The preliminary process simulation shows an 11-step PSA using the sorbent can capture 90% of CO2 with a high H2 recovery rate.

Investigation of sorbents for warm CO<sub>2</sub> capture by pressure swing adsorption

245th National Meeting (2013)

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Investigation of sorbents for warm CO2 capture by pressure swing adsorption

Investigation of sorbents for warm CO₂ capture by pressure swing adsorption