A study of superacidic MoO3/ZrO2 catalysts for methane oxidation

A series of zirconia-supported molybdenum oxide catalysts with different molybdenum loadings prepared using conditions reported to generate “superacidity” have been evaluated for their performance as catalysts for methane oxidation. A marked dependence of Mo content on activity has been observed, wi...

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Bibliographic Details
Published in:Catalysis letters 1999-01, Vol.57 (3), p.109-113
Main Authors: BROWN, A. S. C, HARGREAVES, J. S. J, TAYLOR, S. H
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Catalysts: preparations and properties
Chemistry
Crystallites
Dependence
Exact sciences and technology
General and physical chemistry
Methane
Molybdenum
Molybdenum oxides
Molybdenum trioxide
Oxidation
Raman spectroscopy
Reduction
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Zirconium dioxide
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Summary:A series of zirconia-supported molybdenum oxide catalysts with different molybdenum loadings prepared using conditions reported to generate “superacidity” have been evaluated for their performance as catalysts for methane oxidation. A marked dependence of Mo content on activity has been observed, with the most active material being that with intermediate molybdenum content. 5 wt% MoO3/ZrO2 compares favourably with ZrxCe1-xO2 for methane combustion. The presence of MoO3 is observed to stabilise the tetragonal polymorph of ZrO2 and, as Mo content is increased, dispersed MoO3 crystallites are formed as evidenced by Raman spectroscopy. Temperature-programmed reduction studies evidence differences in the reduction behaviour of the materials as a function of loading. The results indicate that molybdenum oxide supported on monoclinic zirconia gives rise to the most active catalyst. It is tentatively suggested that the formation of a MoO3 monolayer during reaction may be of importance.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1019047632335