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Author Vesecky, S. M. ♦ Paul, J. ♦ Goodman, D. W.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ MATERIALS SCIENCE ♦ ENVIRONMENTAL SCIENCES ♦ NITROGEN OXIDES ♦ REDUCTION ♦ CATALYSIS ♦ METHANE ♦ CHEMICAL REACTIONS ♦ CHEMICAL REACTION KINETICS ♦ PRESSURE DEPENDENCE ♦ PALLADIUM ♦ OXYGEN ♦ OXIDATION ♦ TEMPERATURE RANGE 0400-1000 K
Abstract The catalytic reduction of NO with CH{sub 4} has been studied over Pd(110) in the temperature range 700-800K at a total pressure of 10 Torr. The rate of NO reduction is at a maximum at a high CH{sub 4}NO stoichiometry (8/1) and at a minimum at a low (1/4) CH{sub 4}/NO ratio. Correspondingly, the activation energy for NO reduction decreases with increasing CH{sub 4}/NO ratio, and the reaction orders are -1.0 in NO and +1.5 in CH{sub 4}. Unlike NO, the rate of N{sub 2}O reduction is at a maximum at low CH{sub 4} pressures, and the reaction orders are positive in N{sub 2}O and negative in CH{sub 4}. In the presence of oxygen, NO is oxidized to NO{sub 2}, which is in turn reduced back to NO by CH{sub 4}. The NO/NO{sub 2} oxidation/reduction cycle has the effect of delaying NO reduction to N{sub 2} (or N{sub 2}O) until all of the O{sub 2} is consumed. 15 refs., 8 figs.
ISSN 00223654
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-12
Publisher Place United States
Journal Journal of Physical Chemistry
Volume Number 100
Issue Number 37


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