Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts

Molybdenum oxide nitride (denoted as Mo(O,N)3) was obtained by ammonolysis of α-MoO3 with gaseous ammonia. Electronic and geometric structure, reducibility, and conductivity of Mo(O,N)3 were investigated by XRD, XAS, UV-Vis spectroscopy, and impedance measurements. Catalytic performance in selective...

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Main Authors:	Kühn, Sven, Schmidt-Zhang, Peter, Hahn, Alexander HP, Huber, Manoup, Lerch, Martin, Ressler, Thorsten
Format:	Online
Language:	English
Published:	BioMed Central 2011
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3154853/

id	pubmed-3154853
recordtype	oai_dc
spelling	pubmed-31548532011-08-12 Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts Kühn, Sven Schmidt-Zhang, Peter Hahn, Alexander HP Huber, Manoup Lerch, Martin Ressler, Thorsten Research Article Molybdenum oxide nitride (denoted as Mo(O,N)3) was obtained by ammonolysis of α-MoO3 with gaseous ammonia. Electronic and geometric structure, reducibility, and conductivity of Mo(O,N)3 were investigated by XRD, XAS, UV-Vis spectroscopy, and impedance measurements. Catalytic performance in selective propene oxidation was determined by online mass spectrometry und gas chromatography. Upon incorporation of nitrogen, Mo(O,N)3 maintained the characteristic layer structure of α-MoO3. XRD analysis showed an increased structural disorder in the layers while nitrogen is removed from the lattice of Mo(O,N)3 at temperatures above ~600 K. Compared to regular α-MoO3, Mo(O,N)3 exhibited a higher electronic and ionic conductivity and an onset of reduction in propene at lower temperatures. Surprisingly, α-MoO3 and Mo(O,N)3 exhibited no detectable differences in onset temperatures of propene oxidation and catalytic selectivity or activity. Apparently, the increased reducibility, oxygen mobility, and conductivity of Mo(O,N)3 compared to α-MoO3 had no effect on the catalytic behavior of the two catalysts. The results presented confirm the suitability of molybdenum oxide nitrides as model systems for studying bulk contributions to selective oxidation. BioMed Central 2011-07-15 /pmc/articles/PMC3154853/ /pubmed/21762499 http://dx.doi.org/10.1186/1752-153X-5-42 Text en Copyright ©2010 Kühn et al
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Kühn, Sven Schmidt-Zhang, Peter Hahn, Alexander HP Huber, Manoup Lerch, Martin Ressler, Thorsten
spellingShingle	Kühn, Sven Schmidt-Zhang, Peter Hahn, Alexander HP Huber, Manoup Lerch, Martin Ressler, Thorsten Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts
author_facet	Kühn, Sven Schmidt-Zhang, Peter Hahn, Alexander HP Huber, Manoup Lerch, Martin Ressler, Thorsten
author_sort	Kühn, Sven
title	Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts
title_short	Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts
title_full	Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts
title_fullStr	Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts
title_full_unstemmed	Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts
title_sort	structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts
description	Molybdenum oxide nitride (denoted as Mo(O,N)3) was obtained by ammonolysis of α-MoO3 with gaseous ammonia. Electronic and geometric structure, reducibility, and conductivity of Mo(O,N)3 were investigated by XRD, XAS, UV-Vis spectroscopy, and impedance measurements. Catalytic performance in selective propene oxidation was determined by online mass spectrometry und gas chromatography. Upon incorporation of nitrogen, Mo(O,N)3 maintained the characteristic layer structure of α-MoO3. XRD analysis showed an increased structural disorder in the layers while nitrogen is removed from the lattice of Mo(O,N)3 at temperatures above ~600 K. Compared to regular α-MoO3, Mo(O,N)3 exhibited a higher electronic and ionic conductivity and an onset of reduction in propene at lower temperatures. Surprisingly, α-MoO3 and Mo(O,N)3 exhibited no detectable differences in onset temperatures of propene oxidation and catalytic selectivity or activity. Apparently, the increased reducibility, oxygen mobility, and conductivity of Mo(O,N)3 compared to α-MoO3 had no effect on the catalytic behavior of the two catalysts. The results presented confirm the suitability of molybdenum oxide nitrides as model systems for studying bulk contributions to selective oxidation.
publisher	BioMed Central
publishDate	2011
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3154853/
_version_	1611470524413640704

Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts

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