Integrated gasification combined cycle with CO2 capture and sequestration (IGCC–CCS) is a promising method for reducing emission of greenhouse gases from coal without significantly reducing efficiency. However, the high capital costs of these plants have limited their deployment. The current solvent-based low-temperature CO2 capture process is energy and capital intensive contributing to the problem. Warm CO2 capture has been predicted to be a key enabling technology for IGCC–CC.
This invention is a sorbent for reversible warm CO2 capture. The sorbent includes a high surface area support material, activated carbon, impregnated with MgO. The MgO constitutes anywhere from 5 to 15% by weight of the sorbent. The sorbent material is prepared using an incipient wetness impregnation method and has a large surface area and pore size, which facilitates the rapid pressure swing adsorption of CO2.
- Good regenerability
- Fast kinetics
- Low heat of adsorption