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·m^–3, 0–125 g·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 CO₂ 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 CO₂ capture. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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碳酸酐酶对CO2与位阻胺水溶液反应速率的增强酶促性能

二氧化碳（CO ₂）与两种不同的位阻胺（SHAs），2-氨基-2-乙基-1,3-丙二醇（AEPD）和2-氨基-2-甲基1,3-丙二醇（AMPD），在存在和不存在碳酸酐酶（CA）的情况下，均采用定流电导法进行了实验研究。胺浓度，CA浓度，和温度0.1-0.5千摩尔·^米的范围内变化^-3，0-125克·^米-3，和298-353 K，分别。根据伪一阶反应条件，本征反应速率（k _o）是根据改良的分子反应机理获得的。获得的结果表明，通过添加少量的CA作为促进剂，SHA溶液（AEPD水溶液或AMPD水溶液）与CO ₂之间的反应速率显着提高。这样的结果支持使用前述溶剂系统作为CO ₂捕获的候选物。©2020年化学工业协会和John Wiley＆Sons，Ltd.