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Catalysis Reviews
Science and Engineering
Volume 29, 1987 - Issue 2-3
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Original Articles

Heterogeneous Catalysis by Heteropoly Compounds of Molybdenum and Tungsten

Makoto Misono Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo, Hongo. Bunkyo.ku., Tokyo, Japan, 113
Pages 269-321 | Published online: 19 Dec 2006
 
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Abstract

Heteropolyanions are polymeric oxoanions which are formed by the condensation of more than two different oxoanions [Eq. (1)l. Polyanions consisting of one kind of oxoanion are called isopolyanions [Eq. (2)]. Acidic elements such as Mo, W, V, Nb, and Ta are present as oxoanions in aqueous solutions and polymerize to form polyanions at low pH. Free acids (or acid forms) of these species are called heteropoly and isopoly acids, respectively. Here, the term “heteropoly compounds” is used for heteropoly acids and their salts.

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