Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 22, Pages 10194-10201Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.09.043
Keywords
CO2 capture; Enzyme immobilization; Stability; Carbonic anhydrase; Carbonate
Funding
- US Department of Energy/National Energy Technology Laboratory (DOE/NETL) [DE-FC26-08NT0005498]
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An Integrated Vacuum Carbonate Absorption Process (IVCAP) currently under development could significantly reduce the energy consumed when capturing CO2 from the flue gases of coal-fired power plants. The biocatalyst carbonic anhydrase (CA) has been found to effectively promote the absorption of CO2 into the potassium carbonate solution that would be used in the IVCAP. Two CA enzymes were immobilized onto three selected support materials having different pore structures. The thermal stability of the immobilized CA enzymes was significantly greater than their free counterparts. For example, the immobilized enzymes retained at least 60% of their initial activities after 90 days at 50 degrees C compared to about 30% for their free counterparts under the same conditions. The immobilized CA also had significantly improved resistance to concentrations of sulfate (0.4 M), nitrate (0.05 M) and chloride (0.3 M) typically found in flue gas scrubbing liquids than their free counterparts. (C) 2011 Elsevier Ltd. All rights reserved.
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