CO and NO Adsorption on Alumina–Pd–Mo Catalysts: Effect of the Precursor Salts

The effect of the palladium precursor on the CO and NO adsorption capacity of Pd–MoO3/Al2O3 catalysts was studied. TPR and IR analysis showed that the palladium addition promoted the reduction of Mo6+ to Mo4+. The presence of a higher amount of molybdenum oxide partially reduced improved the NO diss...

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Bibliographic Details
Published in:Journal of catalysis 1999-12, Vol.188 (2), p.270-280
Main Authors: Noronha, F.B., Baldanza, M.A.S., Schmal, M.
Format: Article
Language:English
Subjects:
ADSORPTION
ADVANCED PROPULSION SYSTEMS
ALUMINIUM OXIDES
CARBON MONOXIDE
Catalysis
CATALYSTS
Catalysts: preparations and properties
CATALYTIC CONVERTERS
Chemistry
CO+NO reaction
ENVIRONMENTAL SCIENCES
Exact sciences and technology
General and physical chemistry
MOLYBDENUM
NITRIC OXIDE
PALLADIUM
Pd–Mo catalysts
PRECURSOR
reaction mechanisms
SORPTIVE PROPERTIES
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TPD of CO or NO
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Summary:The effect of the palladium precursor on the CO and NO adsorption capacity of Pd–MoO3/Al2O3 catalysts was studied. TPR and IR analysis showed that the palladium addition promoted the reduction of Mo6+ to Mo4+. The presence of a higher amount of molybdenum oxide partially reduced improved the NO dissociation to N2 and N2O on Pd–Mo/Al2O3 catalysts. This behavior was attributed to the formation of a lower fraction of inactive adsorbed nitrogen species on molybdenum oxide partially reduced. The catalytic behavior of the Pd–Mo/Al2O3 catalysts on the NO+CO reaction could be explained by a bifunctional mechanism. After adsorption and dissociation of NO on Mo4+, the oxygen dissociated is transferred to the Pd. The CO adsorbed on the Pd surface reacts to CO2.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1999.2644