The Capture and Sequestration of Carbon Dioxide

bullet1 The Technology for Capturing Carbon Dioxide
bullet2 CO2 Capture Methods

bullet3 Physical absorption/adsorption

  • In which a solid absorbent (such as activated carbon, zeolites) is passed through the gas stream, and the CO2 is held on the surface of the particles by (non-chemical) surface forces. Once collected, the particles are heated, releasing (desorbing) the CO2.
  • In pressure swing adsorption (PSA), the gas mixture flows through a packed bed of adsorbent at elevated pressure until the adsorption of the desired gas approaches equilibrium conditions at the bed exit. The bed is then regenerated by stopping the feed mixture and reducing the pressure.
  • In temperature swing adsorption (TSA), the adsorbent is regenerated by raising its temperature.
  • Adsorption is not yet considered attractive for large-scale separation of CO2 from flue gas because the capacity and CO2 selectivity of available adsorbents is low. However, it may be successful in combination with another capture technology.
  • Electric Swing Adsorption (ESA)