期刊
CHEMSUSCHEM
卷 10, 期 11, 页码 2518-2526出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201700398
关键词
adsorption; amines; carbon dioxide fixation; mesoporous materials; structure-activity relationship
资金
- Korea CCS R&D Center (KCRC) - Korea government (Ministry of Science, ICT & Future Planning) [NRF-2014M1A8A1049256]
- National Research Foundation of Korea [2014M1A8A1049256] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Poly(ethyleneimine) (PEI)/silica has been widely studied as a solid adsorbent for post-combustion CO2 capture. In this work, a highly macroporous silica (MacS), synthesized by secondary sintering of fumed silica, is compared with various mesoporous silicas with different pore structures as a support for PEI. The silicas with large pore diameter and volume enabled high CO2 adsorption kinetics and capacity, because pore occlusion by the supported PEI was minimized. The steam stability of the silica structures increased with the silica wall thickness owing to suppressed framework ripening. The silicas with low steam stability showed rapid leaching of PEI, which indicated that the PEI squeezed out of the collapsed silica pores leached more readily. Consequently, MacS that had an extra-large pore volume (1.80 cm(3)g(-1)) and pore diameter (56.0 nm), and a thick wall (> 10 nm), showed the most promising CO2 adsorption kinetics and capacity as well as steam stability.
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