Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-6306
Main Title: The impact of steam on the electronic structure of the selective propane oxidation catalyst MoVTeNb oxide (orthorhombic M1 phase)
Author(s): Heine, Christian
Hävecker, Michael
Trunschke, Annette
Schlögl, Robert
Eichelbaum, Maik
Type: Article
Language Code: en
Abstract: The selective propane oxidation catalyst MoVTeNb oxide M1 was investigated by microwave conductivity, synchrotron X-ray photoelectron, soft X-ray absorption and resonant photoelectron spectroscopy under reaction conditions to identify the influence of steam on the electronic bulk and surface properties. Steam significantly increases both the conversion of propane and the selectivity to the target product acrylic acid. The increased catalytic performance comes along with a decreased conductivity, a modification of the surface chemical and electronic structure with an enrichment of covalently bonded V5+ species to the extent of Mo6+, a decreased work function and hence polarity of the surface and a modified valence band structure. The higher degree of covalency in metal oxide bonds affects the mobility of the free charge carriers, and hence explains the decrease of the conductivity with steam. Furthermore we could prove that a subsurface space charge region depleted in electrons and thus an upward bending of the electronic band structure are induced by the reaction mixture, which is however not dependent on the steam content.
URI: https://depositonce.tu-berlin.de//handle/11303/6967
http://dx.doi.org/10.14279/depositonce-6306
Issue Date: 2015
Date Available: 25-Oct-2017
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Creative Commons License: https://creativecommons.org/licenses/by/3.0/
Journal Title: Physical chemistry, chemical physics
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 17
Issue: 14
Publisher DOI: 10.1039/c5cp00289c
Page Start: 8983
Page End: 8993
EISSN: 1463-9084
ISSN: 1463-9076
Appears in Collections:Fakultät 2 Mathematik und Naturwissenschaften » Publications

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