Interplay between defect structure and catalytic activity in the Mo(10-x)V(x)O(y) mixed-oxide system.

Interplay between defect structure and catalytic activity in the Mo(10-x)V(x)O(y) mixed-oxide system.
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Mo(10-x)V(x)O(y)混合氧化物体系中缺陷结构与催化活性之间的相互作用

DOI:
10.1002/cphc.201100393
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发表时间:
2011
期刊:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
Rüdiger-A. Eichel
Rüdiger-A. Eichel
中科院分区:
--
文献类型:
--
作者:
Peter Jakes;Nina Blickhan;Tim Jekewitz;Alfons Drochner;Herbert Vogel;Hartmut Fuess;Rüdiger-A. Eichel

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用电子顺磁共振谱研究了Mo 10 − xAl 2 Oy(0≤ x≤ 10)固溶体体系。结果表明,在Mo_5V_5 O_y中存在顺磁性的钒氧钒物种,其浓度最大。VO 2+浓度作为Mo/V比的函数的定量分析使其能够表征Mo 10 − xMnOy系统中的主要缺陷化学。在这方面,Mo 10 − xOy的半导体性质在Mo 9V 1 Oy-Mo 5V5 Oy的区间中为p型,并且由于在Mo 5V5 Oy-Mo 1V 9 Oy的组成范围中的传导电子而切换为n型。当钒作为受体中心并且由于电荷补偿的原因而形成氧空位时,获得最高的催化活性。对于多相催化,除了表面外,体相中的VO_2 ~+和VO_2 ~+中心也必须考虑。
The Mo10− xVxOy solid‐solution systems (0≤ x≤ 10) were studied by electron paramagnetic resonance spectroscopy. The results show the existence of paramagnetic vanadyl VO2+ species, whose concentration becomes maximal for Mo5V5Oy. A quantitative analysis of the VO2+ concentration as a function of the Mo/V ratio allows it to characterize the prevailing defect chemistry in the Mo10− xVxOy system. In this respect, the semi‐conducting properties of Mo10− xVxOy are p‐type in an interval of Mo9V1Oy–Mo5V5Oy and switch into n‐type because of the conduction electrons in a composition range of Mo5V5Oy–Mo1V9Oy. Highest catalytic activity is obtained when vanadium acts as an acceptor center and oxygen vacancies \left(υ_O^∙∙\right) are formed for reasons of charge compensation. In addition to the surface, υ_O^∙∙ and VO2+ centers in the bulk have to be considered too for heterogeneous catalysis.
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