Liquid amines can be immobilized within the pores of polymeric supports to provide a regenerable CO 2 sorbent. This paper describes the capture of CO 2 by a range of ethanolamines (primary, secondary, and tertiary) immobilized within the pores of high-surface-area poly(methyl methacrylate) beads. These supported amines were used to remove low concentrations (7.6 mmHg) of CO 2 by a pressure swing absorption process, where low-pressure vacuum was used to desorb the CO 2 and regenerate the sorbent. The effect on CO 2 capture of modification of primary amines to secondary amines by reaction with acrylonitrile was also evaluated. The modified amines provided nearly a factor of 2 increase in CO 2 removal capacity compared to the original primary amines. These results suggest that modified amines could potentially be used for CO 2 capture in space life support systems as well as for terrestrial flue gas CO 2 removal applications.
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Filburn et al. (2005) studied this question.