STRUCTURAL AND ACIDIC PROPERTIES OF AEROGELS OF NIOBIA, NIOBIA SILICA, AND NIOBIA TITANIA

被引：31
作者：
MAURER, SM
NG, D
KO, EI
机构：
[1] Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh
来源：
CATALYSIS TODAY | 1993年 / 16卷 / 3-4期
关键词：
D O I：
10.1016/0920-5861(93)80071-8
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Aerogel synthesis is an effective way to stabilize niobia, either by itself or in combination with another oxide, from crystallization induced by thermal treatment. Aerogels of niobia, niobia/silica, and niobia/titania prepared from the respective metal alkoxides were X-ray amorphous after calcination at 773 K for two hours and had surface areas that were higher than samples prepared by precipitation. These materials were also acidic as determined by n-butylamine titration. Thermal treatment at higher temperatures led to the crystallization of niobia or compound formation and a concomitant loss in acidity.
引用
收藏
页码：319 / 331
页数：13
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