Electrochemical promotion by Na of the platinum-catalyzed reaction between CO and NO
- Univ. of Cambridge (United Kingdom); and others
The Pt-catalyzed reduction of NO by CO exhibits strong electrochemical promotion (EP) by backspillover Na supplied from {beta}{sup {double_prime}} alumina under appropriate conditions of temperature, gas composition, and catalyst potential. At high CO partial pressures (P{sub CO}) the EP effect is attenuated by CO island formation and limited availability of chemisorbed NO. At low P{sub CO} regime, Na pumping strongly accelerates the reaction: rate gains of up to 1300% for N{sub 2} production, relative to the unpromoted rate are observed. This can be understood in terms of Na-induced dissociation of chemisorbed molecular NO, which is thought to be the reaction initiating step. The overall kinetic behavior and the dependence of N{sub 2}/N{sub 2}O selectivity on catalyst potential are in good accord with this hypothesis. Thus the EP system also provides direct information about the nature of the reaction mechanism under conditions of elevated pressure. 31 refs., 7 figs.
- OSTI ID:
- 471642
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 161; ISSN JCTLA5; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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