Zirconium-substituted isopolytungstates: Structural models for zirconia-supported tungsten catalysts

被引:59
作者
Carabineiro, H
Villanneau, R
Carrier, X
Herson, P
Lemos, F
Ribeiro, FR
Proust, A
Che, M
机构
[1] Univ Paris 06, Lab Chim Inorgan & Mat Mol, UMR 7071, CNRS, F-75252 Paris 05, France
[2] Univ Tecn Lisboa, Ctr Engn Biol & Quim, Inst Super Tecn, P-1049001 Lisbon, Portugal
[3] Univ Paris 06, Lab React Surface, UMR 7609, CNRS, F-75252 Paris 05, France
关键词
D O I
10.1021/ic051941l
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The synthesis and characterization of a series of mixed W-Zr polynuclear Lindqvist-type complexes, deriving from hexatungstate [W6O19](2-), are described in this work. This family of compounds is built from {W5O18Zr}(2-) moieties as shown by the X-ray structures of the monomeric [W5O18Zr(H2O)(3-n)(DMSO)(n)](2-) (n = 1 and 2) and dimeric [{W5O18Zr(mu-OH)}(2)](6-) anions. A comprehensive spectroscopic study (W-183 NMR, FTIR, Raman, EXAFS, and EPR) of these compounds is presented. The goal of incorporating Zr-IV cations into an oxotungstic core is to obtain spectroscopic models that could mimic the interactions that develop in supported catalysts between the active phase and the supporting oxide. This work tends to show that these molecular compounds can be regarded as soluble structural analogues of WOx/ZrO2 catalysts, which are interesting candidates for the skeletal isomerization of light n-alkanes.
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页码:1915 / 1923
页数:9
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