283594 Adsorption Separation of CO2 and CO to Increase CO2 Conversion to CO for the Production of Synthetic Fuels

Thursday, November 1, 2012: 1:45 PM
329 (Convention Center )
Farhang Abdollahi, Department of Chemical and Biological Engineering , University of Ottawa, Ottawa, ON, Canada, F. Handan Tezel, Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, ON, Canada and Stephen E. Aplin, HDP Group, Inc., Ottawa, ON, Canada

Efforts to reduce greenhouse gas (GHG) emissions from coal-fired power plants are focused primarily on carbon capture and sequestration (CCS) in which sequestration implies permanent disposal, usually underground. If widely implemented, carbon capture will result in availability of huge amounts of CO2. Converting CO2 to CO as an active precursor for synthetic fuel production via the Fischer Tropsch synthesis is proposed in this study as an alternative to CO2 sequestration and disposal. This conversion can be achieved by the reverse water gas shift (RWGS) reaction, in which CO2 reacts with hydrogen to produce CO and H2O. For this method of reducing CO2 emissions to be viable, maximum conversion of CO2 to CO is imperative. Integration of an efficient separation system downstream of the RWGS reactor, and recycling of unreacted CO2 to the reactor inlet, could achieve increased conversion. In this study, adsorption was examined as the primary separation mechanism to enable recycling of CO2. Different adsorbents were investigated in terms of activity for pure gas (CO2 and CO) adsorption. The best-performing candidates were then tested on a multi-component mixture simulating the RWGS reaction outlet stream for a flow-through system. The process characteristics (adsorption equilibrium and kinetics, selectivity, hydrothermal stability), as well as the effects of adsorption temperature and pressure were examined for various scenarios.

Extended Abstract: File Not Uploaded
See more of this Session: Environmental Applications of Adsorption II: Gas Phase
See more of this Group/Topical: Environmental Division