Enhanced kinetics for CO2 sorption in amine-functionalized mesoporous silica nanosphere with inverted cone-shaped pore structure

Feijian Lou, Anfeng Zhang, Guanghui Zhang, Limin Ren, Xinwen Guo and Chunshan Song

Applied Energy, 2020, vol. 264, issue C, No S0306261920301495

Abstract: Amine-functionalized mesoporous silica is one of the most promising solid sorbents for CO2 capture. The pore structure of sorbents plays a crucial role in enhancing sorption and desorption kinetics. In this work, mesoporous silica nanosphere (MSN) with inverted cone-shaped pore structure was synthesized and examined as the support for polyethyleneimine (PEI). The unique pore structure of MSN support for PEI resulted in significantly faster sorption and desorption rates and higher sorption capacity within short sorption time when compared to the benchmark support SBA-15 with the same amount of PEI loading. With 65 wt% PEI loading, 65PEI/MSN sorbent showed about 50% higher working capacity, together with 27% faster rate of CO2 sorption and 71% faster rate of CO2 desorption, compared to that with 65PEI/SBA-15 in sorption/desorption cycles. PEI/MSN sorbents have great potential for practical applications in CO2 capture.

Keywords: CO2 capture; Sorption/desorption kinetics; Amine functionalization; Mesoporous silica; Polyethyleneimine (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (3)

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DOI: 10.1016/j.apenergy.2020.114637

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