NO reduction with acetaldehyde on alumina-supported Pd–Mo catalysts

The reduction of NO with acetaldehyde on alumina-supported Pd, Mo, and Pd–Mo catalysts was studied. Two Mo loadings were used (8 and 20%), and the Pd–8% Mo/Al 2O 3 catalyst was the most active for NO conversion. Temperature-programmed desorption and infrared measurements of adsorbed acetaldehyde ind...

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Bibliographic Details
Published inJournal of catalysis Vol. 242; no. 1; pp. 48 - 57
Main Authors de Mello, L.F., Noronha, F.B., Schmal, M.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Inc 15.08.2006
Elsevier
Elsevier BV
Subjects
Acetaldehyde
Catalysis
Chemistry
Exact sciences and technology
General and physical chemistry
Molybdenum
Palladium
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TPD and reactions
NO
Palladium
TPD and reactions
Molybdenum
Acetaldehyde
Mixed catalyst
Transition metal
Aldehyde
Supported catalyst
Chemical reduction
Heterogeneous catalysis
Nitric oxide
Alumina
Platinoid
Catalyst support
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Summary:The reduction of NO with acetaldehyde on alumina-supported Pd, Mo, and Pd–Mo catalysts was studied. Two Mo loadings were used (8 and 20%), and the Pd–8% Mo/Al 2O 3 catalyst was the most active for NO conversion. Temperature-programmed desorption and infrared measurements of adsorbed acetaldehyde indicated that acetate species are probably an important reaction intermediate. The presence of Pd in close contact with Mo favors formation of the acetate species, which could explain the higher activity for the Pd8Mo sample. The 20% Mo loading produced bulk MoO 3, which covered part of the Pd sites, and thus the activity for this catalyst was lower.
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2006.05.013