Catalytic consequences of composition in polyoxometalate clusters with keggin structure

被引：103

作者：

Macht, Josef

Janik, Michael J.

Neurock, Matthew

Iglesia, Enrique ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA

[2] Penn State Univ, Dept Chem Engn, University Pk, PA 16802 USA

[3] Univ Virginia, Dept Chem Engn, Charlottesville, VA 22904 USA

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2007年 / 46卷 / 41期

关键词：

acid catalysis; alcohols; cluster compounds; dehydration; polyoxometalates;

D O I：

10.1002/anie.200701292

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

(Graph Presented) Rate constants for acid-catalyzed butanol dehydration on Keggin-type polyoxometalate clusters H8-nXn+W 12O40 (X=P, Si, Al, Co) increase as the oxidation state of the central atom increases and the number of cluster protons concurrently decreases (see diagram). These trends reflect the lower deprotonation enthalpies of clusters with high valent central atoms and their stability as the anionic conjugate base in ionic transition states involved in dehydration catalysis. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.

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收藏

页码：7864 / 7868

页数：5

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