Pore size and liquid impregnation of microporous aluminosilicate gels and glasses

被引:13
作者
Vendange, V
Colomban, P
Larche, F
机构
[1] ONERA OM,F-92322 CHATILLON,FRANCE
[2] LASIR CNRS,F-94320 THIAIS,FRANCE
[3] UNIV MONTPELLIER 2,GDPC CNRS,F-34095 MONTPELLIER 5,FRANCE
来源
MICROPOROUS MATERIALS | 1996年 / 5卷 / 06期
关键词
aluminosilicate; xerogel; sol-gel; impregnation;
D O I
10.1016/0927-6513(95)00074-7
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Optically clear monolithic (OCM) gels of microporous aluminosilicates have been prepared by slow hydrolysis-polycondensation of alkoxides. Subsequent heating induces transformations into OCM microporous glasses. The surface area (similar to 610 m(2)/g after drying at 300 degrees C) and the pore volume (similar to 0.35 cc/g at 300 degrees C) decrease monotonously with increasing annealing temperature. However, after heat treatment at 600 degrees C under air (glass state) the monoliths are still microporous. Modifications of the xerogel pore distribution by an impregnation process and metal aggregate formation with pyrolysis are studied by N-2 adsorption-desorption analysis and small-angle X-ray scattering (SAXS). The microporous structure becomes mesoporous. A model of microporous impregnation in the gel or glass state is proposed.
引用
收藏
页码:389 / 400
页数:12
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