The impact of steam on the electronic structure of the selective propane oxidation catalyst MoVTeNb oxide (orthorhombic M1 phase)

dc.contributor.authorHeine, Christian
dc.contributor.authorHävecker, Michael
dc.contributor.authorTrunschke, Annette
dc.contributor.authorSchlögl, Robert
dc.contributor.authorEichelbaum, Maik
dc.date.accessioned2017-10-25T06:27:51Z
dc.date.available2017-10-25T06:27:51Z
dc.date.issued2015
dc.description.abstractThe 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.en
dc.identifier.eissn1463-9084
dc.identifier.issn1463-9076
dc.identifier.pmid25746609
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/6967
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6306
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftende
dc.titleThe impact of steam on the electronic structure of the selective propane oxidation catalyst MoVTeNb oxide (orthorhombic M1 phase)en
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1039/c5cp00289c
dcterms.bibliographicCitation.issue14
dcterms.bibliographicCitation.journaltitlePhysical chemistry, chemical physicsen
dcterms.bibliographicCitation.originalpublishernameRoyal Society of Chemistryde
dcterms.bibliographicCitation.originalpublisherplaceCambridgede
dcterms.bibliographicCitation.pageend8993
dcterms.bibliographicCitation.pagestart8983
dcterms.bibliographicCitation.volume17
tub.accessrights.dnbfree
tub.affiliationFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.publisher.universityorinstitutionTechnische Universität Berlin

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