期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 84, 期 1-3, 页码 357-365出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2005.06.010
关键词
adsorption; carbon dioxide; organically functionalized SBA-15; water vapor; aminosilane
Amino silane-modified SBA-15 was prepared by grafting various ammosilanes on mesoporous silica SBA-15, and its adsorption characteristics towards carbon dioxide were examined. The amount of carbon dioxide adsorbed was almost the same for both in the presence and in the absence of water vapor. It was found that the efficiency of adsorption, defined as the number of adsorbed carbon dioxide molecules per nitrogen atom of aminosilanemodified SBA-15, increased with increasing the surface density of amine. Infrared spectroscopy revealed that carbon dioxide was adsorbed on aminosilane-modified SBA-15 through the formation of alkylammonium carbamate in the presence and in the absence of water vapor. It was suggested that amine pairs, on which carbon dioxide was adsorbed through formation of alkylammonium carbamate, increased with increasing surface density of amine. In addition, influence of amine structure on the adsorption capacity has also been discussed. (c) 2005 Elsevier Inc. Ail rights reserved.
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