Study of the effect of the base, the silica and the niobium sources on the [Nb]-MCM-41 synthesized at room temperature

被引：23

作者：

Gallo, Jean Marcel R. ^{[1
]}

Pastore, Heloise O. ^{[1
]}

Schuchardt, Ulf ^{[1
]}

机构：

[1] Univ Estadual Campinas, Inst Quim, BR-13084971 Campinas, SP, Brazil

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2008年 / 354卷 / 15-16期

基金：

巴西圣保罗研究基金会;

关键词：

transition metals; catalysis; ceramics; X-ray diffraction;

D O I：

10.1016/j.jnoncrysol.2007.10.010

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

[Nb]-MCM-41 was synthesized at room temperature by varying the base (tetramethylammonium hydroxide or ammonium hydroxide), the silica source (tetraethyl orthosilicate or tetramethyl orthosilicate), the niobium source (ammonium niobium oxalate, NH4[NbO-(C2O4)(2)(H2O)(2)]center dot 3H(2)O, or potassium niobate, K8Nb6O19) and the order of addition of the niobium source (before or after the silica source). These variations were determinant in the amount of niobium incorporated into the framework and in the structural order of the [Nb]-MCM-41 obtained. Only one method led to the formation of [Nb]-MCM-41 with the desired characteristics and active in the epoxidation of cis-cyclooctene with tert-butyl hydroperoxide leading to 19% conversion and 95% selectivity for cyclooctene oxide after 10 h. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1648 / 1653

页数：6

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