| Interplay between Defect Structure and Catalytic Activity in the Mo(10-x) V(x) O(y) Mixed-Oxide System. | |
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MedLine Citation:
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PMID: 22147498 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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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. |
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Authors:
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Peter Jakes; Nina Blickhan; Tim Jekewitz; Alfons Drochner; Herbert Vogel; Hartmut Fuess; Rüdiger-A Eichel |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-6 |
Journal Detail:
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Title: Chemphyschem : a European journal of chemical physics and physical chemistry Volume: - ISSN: 1439-7641 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100954211 Medline TA: Chemphyschem Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
Affiliation:
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Institut für Physikalische Chemie, Universität Freiburg, Albertstr. 21, 79104 Freiburg (Germany). |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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