期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 48, 期 24, 页码 14828-14836出版社
AMER CHEMICAL SOC
DOI: 10.1021/es504265p
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资金
- Korea CCS RD Center (KCRC) [2014M1A8A1049309]
- Basic Science Research Program through National Research Foundation (NRF) of Korea [2012R1A1A1042450]
- Korea government (Ministry of Science, ICT & Future Planning)
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea government Ministry of Trade, Industry, and Energy [20134010200600]
- National Research Foundation of Korea [2012R1A1A1042450] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Chabazite (CHA) zeolites with a pore size of 0.37 x 0.42 nm(2) are expected to separate CO2 (0.33 nm) from larger N-2 (0.364 nm) in postcombustion flue gases by recognizing their minute size differences. Furthermore, the hydrophobic siliceous constituent in CHA membranes can allow for maintaining the CO2/N-2 separation performance in the presence of H2O in contrast with the CO2 affinity-based membranes. In an attempt to increase the molecular sieving ability, the pore mouth size of all silica CHA (Si-CHA) particles was reduced via the chemical vapor deposition (CVD) of a silica precursor (tetraethyl orthosilicate). Accordingly, an increase of the CVD treatment duration decreased the penetration rate of CO2 into the CVD-treated Si-CHA particles. Furthermore, the CVD process was applied to siliceous CHA membranes in order to improve their CO2/N-2 separation performance. Compared to the intact CHA membranes, the CO2/N-2 maximum separation factor (max SF) for CVD-treated CHA membranes was increased by similar to 2 fold under dry conditions. More desirably, the CO2/N-2 max SF was increased by similar to 3 fold under wet conditions at similar to 50 degrees C, a representative temperature of the flue gas stream. In fact, the presence of H2O in the feed disfavored the permeation of N-2 more than that of CO2 through CVD-modified CHA membranes and thus, contributed to the increased CO2/N-2 separation factor.
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