Synthesis, characterization and catalytic properties of sol-gel derived mixed oxides

被引：30

作者：

de Farias, RF ^{[1
]}

Arnold, U ^{[1
]}

Martínez, L ^{[1
]}

Schuchardt, U ^{[1
]}

Jannini, MJDM ^{[1
]}

Airoldi, C ^{[1
]}

机构：

[1] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP, Brazil

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2003年 / 64卷 / 12期

基金：

巴西圣保罗研究基金会;

关键词：

D O I：

10.1016/S0022-3697(03)00276-2

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Alumina and 1:1 mixed oxides of Al2O3-ZrO2, Al2O3-TiO2, SiO2-TiO2 and ZrO2-TiO2 were synthesized via a sol-gel process by the so-called neutral amine route, followed by calcination at 600 degreesC. The mixed oxides were characterized before calcination by X-ray diffraction, revealing ordered hexagonal (Al2O3, Al2O3-ZrO2, ZrO2-TiO2) and lamellar (SiO2-TiO2, Al2O3-TiO2) structures. After calcination, all samples exhibited amorphous structures. Surface areas and pore characteristics of all materials were determined by nitrogen adsorption isotherms. The calcined oxides are active catalysts in the epoxidation of cyclooctene with tert-butyl hydroperoxide as oxidant. Epoxide yields from 14 to 45% were found for reaction times of 24 h. The titanium oxide containing catalysts are the most active and selective ones. On the other hand, the poisoning of acidic centers yields a decreasing activity while increasing selectivity. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：2385 / 2389

页数：5

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