Carbonic anhydrase promoted absorption of CO2 into potassium carbonate solutions. Issue 1 (19th August 2014)

• Record Type: Journal Article
• Authors: Thee, Hendy; Smith, Kathryn H.; da Silva, Gabriel; Kentish, Sandra E.; Stevens, Geoffrey W.
• Is Part Of: Greenhouse gases. Volume 5:Issue 1(2015:Feb.)
• Page Start: 108
• Page End: 114
• Publication Date: 2014-08-19
• Subjects: Greenhouse gases -- Periodicals; Greenhouse gas mitigation -- Periodicals; 363.7387405
• DOI: 10.1002/ghg.1455
• Languages: English
• ISSNs: 2152-3878

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p>The effect of adding relatively small quantities of Novozymes NS81239 (NCA) carbonic anhydrase enzyme on the absorption of CO₂ into a 30 wt% potassium carbonate solution has been investigated. Results demonstrated that at 40°C the addition of 2 μM NCA enhances the pseudo‐first‐order rate coefficient and thus the overall absorption process of CO₂ into potassium carbonate solvents by around 30%. As the enzyme concentration is increased in the range of about 0 to 2 μM the enhancement increases according to a first order relationship, although further increasing the NCA concentration to 9 μM presented no greater catalytic effect than that from 2 μM. The rate coefficient for NCA catalyzed CO₂ hydration measured in 30 wt% K₂CO₃ solution at 40°C in a wetted wall column is similar to that measured in dilute, neutral pH media at room temperature using stopped flow spectrophotometry. This work also demonstrates that, at a constant enzyme concentration, the overall absorption of CO₂ into carbonate solvents increases with temperature from 40°C to 60°C, whereas above this range an increase in temperature proves to be counter‐productive.</p> </abstract>