Transformation of layered polyoxometallate cluster salts into mesoporous materials

被引：14

作者：

Holland, BT ^{[1
]}

Isbester, PK ^{[1
]}

Munson, EJ ^{[1
]}

Stein, A ^{[1
]}

机构：

[1] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA

来源：

MATERIALS RESEARCH BULLETIN | 1999年 / 34卷 / 03期

基金：

美国国家科学基金会;

关键词：

inorganic compounds; nanostructures; chemical synthesis; sol-gel chemistry; diffusion;

D O I：

10.1016/S0025-5408(99)00031-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new approach to the formation of mesoporous materials has been developed, based on a two-step "salt-gel" synthesis, in which mesoporous aluminophosphates, galloaluminophosphates, and aluminosilicates have been created. The first step involves pre-organizing charged inorganic clusters (MO4Al12(OH)(24)(H2O)(12)(7+), M = Al Or Ga) into a layered mesoscopic material with oppositely charged organic surfactant molecules. In the second step, phosphate or silicate linker molecules are added, which diffuse through the cluster/surfactant salt, react with the clusters, and transform the layered precursor into a non-lamellar mesostructured material. Removal of the surfactant from the alumino- and galloaluminophosphates by anion-exchange and from the aluminosilicates by calcination results in mesoporous materials with BET surface areas up to 630, 455, and 431 m(2)/g, respectively. Direct condensation by calcination of polyoxoaluminate cluster salts without additional linkers produces nanometer-sized one-dimensional strings. (C) 1999 Elsevier Science Ltd.

引用

页码：471 / 482

页数：12

共 22 条

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