期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 215, 期 -, 页码 76-83出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2015.05.037
关键词
Carbon dioxide capture; Density functional theory calculation; Mesoporous silica; Surface modification; Tetraethylenepentamine
类别
资金
- Ministry of Economy, Trade and Industry (METI), Japan
Amine-impregnated mesoporous silica materials were prepared using surface-modified silica supports for CO2 capture, and the effects of the surface chemical structure of the support on the CO2 adsorption performance of surface-modified silica-supported amines were investigated systematically. The thermal stability and CO2 adsorption characteristics of amine-impregnated materials were determined experimentally. The surface modification of mesoporous silicas by particular functional groups leads to increases in thermal stability of loaded amine and CO2 adsorption capacity. In particular, the CO2 adsorption performance in the presence of water vapor was remarkably enhanced by surface modification of the silica support. Computational analyses indicated that increases in the thermal stability of loaded amine and CO2 adsorption capacity were due to the hydrophilicity and electron donativity (nucleophilicity) of introduced functional groups. Compared to non-modified support, CO2 adsorption capacities for surface-modified silica supported amines were increased up to 118% in the absence of water vapor and 182% in the presence of water vapor. It is suggested that the surface structure of supports for amine-impregnated mesoporous silica materials plays an important role in CO2 adsorption performance. (C) 2015 Elsevier Inc. All rights reserved.
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