Porosity and surface acidity of SiO2-Al2O3 xerogels

被引：23

作者：

Bandosz, TJ ^{[1
]}

Lin, C

Ritter, JA

机构：

[1] CUNY City Coll, Dept Chem, New York, NY 10031 USA

[2] Univ S Carolina, Swearingen Engn Ctr, Dept Chem Engn, Columbia, SC 29208 USA

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 1998年 / 198卷 / 02期

关键词：

silica; alumina; xerogels; surface acidity; pore structure;

D O I：

10.1006/jcis.1997.5297

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The structural and chemical properties of silica-alumina xerogels obtained using the sol-gel process were investigated. As methods of characterization, sorption of nitrogen, thermal analysis, and potentiometric titration were chosen. The results obtained showed a high contribution of micropores in the structure of the silica-alumina xerogels, which decreased with increasing content of aluminum. An investigation of the acidic-basic properties of the surfaces showed the presence of centers which have not been detected in commercial catalysts obtained in a more traditional way. These centers may be the result of synergy between our components and/or different coordinations between the cations. (C) 1998 Academic Press.

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页码：347 / 353

页数：7

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