Silica-Supported Sterically Hindered Amines for CO2 Capture

Title
Silica-Supported Sterically Hindered Amines for CO2 Capture
Authors
유천재Jason J. LeeChia-Hsin ChenSophia E. HayesCarsten SieversChristopher W. Jones
Issue Date
2018-09
Publisher
Langmuir
Citation
VOL 34, NO 41-12292
Abstract
Most studies exploring the capture of CO2 on solid-supported amines have focused on unhindered amines or alkylimine polymers. It has been observed in extensive solution studies that another class of amines, namely sterically hindered amines, can exhibit enhanced CO2 capacity when compared to their unhindered counterparts. In contrast to solution studies, there has been limited research conducted on sterically hindered amines on solid supports. In this work, one hindered primary amine and two hindered secondary amines are grafted onto mesoporous silica at similar amine coverages, and their adsorption performances are investigated through fixed bed breakthrough experiments and thermogravimetric analysis. Furthermore, chemisorbed CO2 species formed on the sorbents under dry and humid conditions are elucidated using in situ Fourier-transform infrared spectroscopy. Ammonium bicarbonate formation and enhancement of CO2 adsorption capacity is observed for all supported hindered amines under humid conditions. Our experiments in this study also suggest that chemisorbed CO2 species formed on supported hindered amines are weakly bound, which may lead to reduced energy costs associated with regeneration if such materials were deployed in a practical separation process. However, overall CO2 uptake capacities of the solid supported hindered amines are modest compared to their solution counterparts. The oxidative and thermal stabilities of the supported hindered amine sorbents are also assessed to give insight into their operational lifetimes.
URI
http://pubs.kist.re.kr/handle/201004/72787
ISSN
0743-7463
Appears in Collections:
KIST Publication > Article
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