Thermal Decomposition of Ammonium Paratungstate Tetrahydrate Traced by In Situ UV/Vis Diffuse Reflectance Spectroscopy

被引：7

作者：

Fait, Martin J. G. ^{[1
]}

Lunk, Hans-Joachim ^{[2
]}

机构：

[1] Leibniz Inst Katalyse, D-18059 Rostock, Germany

[2] Global Tungsten & Powders Corp, Towanda, PA 18848 USA

来源：

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY | 2012年 / 02期

关键词：

In situ spectroscopy; Thermochemistry; Structure elucidation; Tungsten; Polyoxometalates; TEMPERATURE DEPENDENCE; TUNGSTEN; OXIDES; CATALYSTS; VANADIUM; XRD;

D O I：

10.1002/ejic.201100838

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

In situ UV/Vis diffuse reflectance spectra of ammonium paratungstate tetrahydrate at increasing temperatures were recorded in oxidative as well as in reductive atmospheres. From the edge energy of the ligand-to-metal charge transfer transition of tungsten ions, the number of bridging W-O-W bonds, N, was determined. The increase of N with temperature indicates a stepwise enhancement of the condensation of WO6 octahedra to finally form WO3 in an oxidative atmosphere.

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收藏

页码：213 / 216

页数：4

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