A Reversible Sorbent for Warm CO2 Capture by Pressure Swing Adsorption

Applications

 An application for this technology is found in CO2 capture.

Problem Addressed

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.

Technology

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. 

Advantages

  • Good regenerability
  • Fast kinetics
  • Low heat of adsorption