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Interplay between Defect Structure and Catalytic Activity in the Mo(10-x) V(x) O(y) Mixed-Oxide System.
MedLine Citation:
PMID:  22147498     Owner:  NLM     Status:  Publisher    
The Mo(10-x) V(x) O(y) solid-solution systems (0≤x≤10) were studied by electron paramagnetic resonance spectroscopy. The results show the existence of paramagnetic vanadyl VO(2+) species, whose concentration becomes maximal for Mo(5) V(5) O(y) . A quantitative analysis of the [VO(2+) ] concentration as a function of the Mo/V ratio allows it to characterize the prevailing defect chemistry in the Mo(10-x) V(x) O(y) system. In this respect, the semi-conducting properties of Mo(10-x) V(x) O(y) are p-type in an interval of Mo(9) V(1) O(y) -Mo(5) V(5) O(y) and switch into n-type because of the conduction electrons in a composition range of Mo(5) V(5) O(y) -Mo(1) V(9) O(y) . Highest catalytic activity is obtained when vanadium acts as an acceptor center and oxygen vacancies ${\left( {\upsilon _{\rm{O}}^{ \bullet \bullet } } \right)}$ are formed for reasons of charge compensation. In addition to the surface, ${\upsilon _{\rm{O}}^{ \bullet \bullet } }$ and VO(2+) centers in the bulk have to be considered too for heterogeneous catalysis.
Peter Jakes; Nina Blickhan; Tim Jekewitz; Alfons Drochner; Herbert Vogel; Hartmut Fuess; Rüdiger-A Eichel
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-6
Journal Detail:
Title:  Chemphyschem : a European journal of chemical physics and physical chemistry     Volume:  -     ISSN:  1439-7641     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954211     Medline TA:  Chemphyschem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Institut für Physikalische Chemie, Universität Freiburg, Albertstr. 21, 79104 Freiburg (Germany).
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