Determination of the Hydroxyl Content in Gels and Porous "Glasses" from Alkoxide Hydrolysis by Combined TGA and BET Analysis

被引：12

作者：

Vendange, V. ^{[1
]}

Colomban, Ph. ^{[1
,2
]}

机构：

[1] ONERA OM BP 72, F-92322 Chatillon, France

[2] LASIR CNRS, F-94320 Thiais, France

来源：

JOURNAL OF POROUS MATERIALS | 1996年 / 3卷 / 03期

关键词：

sol-gel; water; hydroxyl; protons; sintering; aluminosilicates;

D O I：

10.1007/BF01134032

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The hydroxyl group and water contents of alumina, mullite and alumino(boro) silicate gels and porous glasses (xerogels) are discussed on the basis of thermogravimetric, gas adsorption and density measurements. Comparison is made for powder prepared by instant hydrolysis and optically clear monoliths by slow hydrolysis, heated in various atmospheres (air, vacuum, hydrogen). The hydroxyl content appears to depend on the Al/Si ratio: 6 OH-/nm(2) for alumina mesoporous glasses, 2 OH-/nm(2) for aluminosilicate mesoporous glasses and 3 OH-/nm(2) for microporous ones, typically.

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收藏

页码：193 / 200

页数：8

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