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Title: Adsorptive and catalytic properties of alumina-supported Pd-Mo catalysts

Abstract

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.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Univ. Federal do Rio de Janeiro (BR)
OSTI Identifier:
20076094
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 192; Journal Issue: 1; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0021-9517
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 54 ENVIRONMENTAL SCIENCES; CATALYSTS; PALLADIUM; MOLYBDENUM; SORPTIVE PROPERTIES; CATALYTIC EFFECTS; ETHANOL; CARBON MONOXIDE; NITRIC OXIDE; ADSORPTION; DECOMPOSITION; DEHYDROGENATION; OXIDATION; FUEL ADDITIVES; EXHAUST GASES; CATALYTIC CONVERTERS

Citation Formats

Baldanza, M.A.S., Mello, L.F. de, Vannice, A., Noronha, F.B., and Schmal, M. Adsorptive and catalytic properties of alumina-supported Pd-Mo catalysts. United States: N. p., 2000. Web. doi:10.1006/jcat.2000.2839.
Baldanza, M.A.S., Mello, L.F. de, Vannice, A., Noronha, F.B., & Schmal, M. Adsorptive and catalytic properties of alumina-supported Pd-Mo catalysts. United States. doi:10.1006/jcat.2000.2839.
Baldanza, M.A.S., Mello, L.F. de, Vannice, A., Noronha, F.B., and Schmal, M. Mon . "Adsorptive and catalytic properties of alumina-supported Pd-Mo catalysts". United States. doi:10.1006/jcat.2000.2839.
@article{osti_20076094,
title = {Adsorptive and catalytic properties of alumina-supported Pd-Mo catalysts},
author = {Baldanza, M.A.S. and Mello, L.F. de and Vannice, A. and Noronha, F.B. and Schmal, M.},
abstractNote = {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.},
doi = {10.1006/jcat.2000.2839},
journal = {Journal of Catalysis},
issn = {0021-9517},
number = 1,
volume = 192,
place = {United States},
year = {2000},
month = {5}
}