Biocatalytic aided CO2 transfer through an aqueous membrane, at relatively high CO2 partial pressure

N. Null Favre (1) , A.C. Pierre (1)

1 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

A hydrophilic membrane impregnated with an aque.ous carbonic anhydrase enzyme solution was applied in a study on the transfer of COz under partial pressures PC02 '" 1 atm or '" 0.1 atm. Consistent data on the transfer rate were obtained by 3 techniques regarding: (1) the COz content in the outcoming gas in sweeping nitrogen, measured with an infrared CO2 gas sensor; (2) the mass ofsolid CaC03 precipitated when the previous effluent flow is passed through a pHIO CaCh aqueous solution; and (3) the pressure increase on the effiuent Bide when gas flow is stopped. After a transition regime, it was found that a steady state established in which acceleration of the COz transfer by the enzyme depended on the presence of a buffer, the retentate COz partial pressure and the enzyme concentration. In a phosphate buffer, a maximum permeance was found for an enzyme concentration 0.2 mg/mL. Its value was "'1.1 10-8 mol m'Zs-IPa-1 at 0.1 atm COz.

Mots clés: COz capture; aqueous membrane; carbonic anhydrase

Domaines: Catalyse; Environnement et Société

N. Null Favre, A.C. Pierre. Biocatalytic aided CO2 transfer through an aqueous membrane, at relatively high CO2 partial pressure. Biocatalytic aided CO2 transfer through an aqueous membrane, at relatively high CO2 partial pressure, Oct 2010, Washington DC, United States. pp.110-116. ⟨hal-00533634⟩