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Main Title: Structure and properties of molybdenum oxide nitrides as model systems for selective oxidation catalysts
Author(s): Kühn, Sven
Schmidt-Zhang, Peter
Hahn, Alexander H. P.
Huber, Manoup
Lech, Martin
Ressler, Thorsten
Type: Article
Language Code: en
Abstract: 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.
Issue Date: 15-Jul-2011
Date Available: 3-Feb-2016
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): molybdenum oxide nitrides
selective oxidation
catalytic behavior
selektive Oxidation
katalytisches Verhalten
Sponsor/Funder: DFG, EXC 314, Unifying Concepts in Catalysis
Journal Title: Chemistry central journal
Publisher: BioMed Central
Publisher Place: London
Volume: 5
Article Number: 42
Publisher DOI: 10.1186/1752-153X-5-42
EISSN: 1752-153X
Appears in Collections:Inst. Chemie » Publications

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