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.

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页码：319 / 331

页数：13

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