Variation of the vanadium oxidation state within a VPO catalyst layer in a membrane reactor: XPS mapping and modelling

被引：9
|
作者：
Suchorski, Y.
Munder, B.
Becker, S.
Rihko-Struckmann, L.
Sundmacher, K.
Weiss, H.
机构：
[1] Univ Magdeburg, Inst Chem, D-39106 Magdeburg, Germany
[2] Max Planck Inst Dynam Komplexer Tech Syst, D-39106 Magdeburg, Germany
来源：
APPLIED SURFACE SCIENCE | 2007年 / 253卷 / 13期
关键词：
VPO catalysts; electrochemical membrane reactor; XPS; modelling;
D O I：
10.1016/j.apsusc.2006.12.082
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Recently, the feasibility of butane oxidation in an electrochemical membrane reactor (EMR) using a vanadium phosphorus oxide (VPO) catalyst layer on a tubular anodic electrode has been reported. This novel application of EMR gives rise to questions about the vanadium oxidation state (V-ox) under working conditions and about its spatial distribution in the catalyst layer. It has now been determined by means of position-resolved XPS measurements. In addition, model calculations on the spatial V-ox. distribution have been performed for the first time. The simulations reveal a non-uniform 3D distribution of V-ox due to the relative rate of reduction and re-oxidation processes in the catalyst layer, in good agreement with the experimental XPS data. (c) 2007 Elsevier B.V. All rights reserved.
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收藏
页码：5904 / 5909
页数：6
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