The enhanced enzymatic performance of carbonic anhydrase on the reaction rate between CO2 and aqueous solutions of sterically hindered amines

Cihan N., YÜKSEL ORHAN Ö.

GREENHOUSE GASES-SCIENCE AND TECHNOLOGY, vol.10, no.5, pp.925-937, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 10 Issue: 5
  • Publication Date: 2020
  • Doi Number: 10.1002/ghg.2012
  • Journal Name: GREENHOUSE GASES-SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Agricultural & Environmental Science Database, Applied Science & Technology Source, CAB Abstracts, Compendex, Geobase, Greenfile, INSPEC, Pollution Abstracts
  • Page Numbers: pp.925-937
  • Keywords: 2-amino-2-ethyl-1, 3-propanediol (AEPD), 2-amino-2-methyl-1, 3-propanediol (AMPD), carbon dioxide capture, carbonic anhydrase, sterically hindered amines, stopped-flow, DIOXIDE ABSORPTION, NONAQUEOUS SOLUTIONS, REACTION-MECHANISM, REACTION-KINETICS, PIPERAZINE, CAPTURE, 2-AMINO-2-ETHYL-1,3-PROPANEDIOL, TEMPERATURE, DESORPTION, GLYCEROL
  • Hacettepe University Affiliated: Yes

Abstract

The kinetics of the reactions of carbon dioxide (CO2) with aqueous solutions of two different sterically hindered amines (SHAs), 2-amino-2-ethyl-1,3-propanediol (AEPD) and 2-amino-2-methyl-1,3-propanediol (AMPD), in the presence and absence of carbonic anhydrase (CA) was investigated experimentally using stopped-flow conductimetry. The amine concentration, CA concentration, and temperature were varied within the ranges of 0.1-0.5 kmol center dot m(-3), 0-125 g center dot m(-3), and 298-353 K, respectively. Based on pseudo first-order reaction conditions, the intrinsic reaction rate (k(o)) was obtained according to a modified termolecular reaction mechanism. The obtained results showed that the reaction rate between the SHA solutions (either aqueous AEPD or aqueous AMPD) and CO(2)was enhanced significantly upon adding small amounts of CA as a promoter. Such a result supports the use of the aforementioned solvent system as a candidate for CO(2)capture. (c) 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.