Activity and stability of immobilized carbonic anhydrase for promoting CO 2 absorption into a carbonate solution for post-combustion CO 2 capture

Shihan Zhang, Zhaohui Zhang, Yongqi Lu, Massoud Rostam-Abadi, Andrew Jones

Research output: Contribution to journalArticle

Abstract

An Integrated Vacuum Carbonate Absorption Process (IVCAP) currently under development could significantly reduce the energy consumed when capturing CO 2 from the flue gases of coal-fired power plants. The biocatalyst carbonic anhydrase (CA) has been found to effectively promote the absorption of CO 2 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 90days at 50°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 (0.4M), nitrate (0.05M) and chloride (0.3M) typically found in flue gas scrubbing liquids than their free counterparts.

Original languageEnglish (US)
Pages (from-to)10194-10201
Number of pages8
JournalBioresource Technology
Volume102
Issue number22
DOIs
StatePublished - Nov 1 2011

Keywords

  • CO capture
  • Carbonate
  • Carbonic anhydrase
  • Enzyme immobilization
  • Stability

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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