Adsorptive and catalytic properties of alumina-supported Pd-Mo catalysts
The adsorption properties of ethanol, CO, and NO on Pd, Mo, and Pd-20Mo/Al{sub 2}O{sub 3} catalysts were studied using TPD and IR techniques as well as the reactions of NO + CO and ethanol + NO. The presence of Pd favored decomposition and dehydrogenation of ethanol, while Mo presented activity for oxidative dehydrogenation. The Pd-Mo catalyst showed better formation of N{sub 2} on TPD of NO, probably due to the NO adsorption on partially reduced molybdenum oxide. DRIFT results for the NO + CO reaction on the Pd-20Mo catalyst exhibited bands which correspond to nitrate or nitrous complexes and hydroxyl groups besides NCO species. MoO{sub 3} addition to a Pd/Al{sub 2}O{sub 3} catalyst favored the formation of acetaldehyde at lower temperatures. A redox mechanism was proposed to explain the molybdenum promotional effect on Pd in the CO + NO reaction, evidencing Mo as promoter when the reducible oxide reacts with NO. However, molybdenum oxide does not promote the ethanol + NO reaction and this may be due to different reaction mechanisms.
- Research Organization:
- Univ. Federal do Rio de Janeiro (BR)
- OSTI ID:
- 20076094
- Journal Information:
- Journal of Catalysis, Vol. 192, Issue 1; Other Information: PBD: 15 May 2000; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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