Adsorbed species and reaction rates for NO-CO over Rh(111)
- Wayne State Univ., Detroit, MI (United States)
- Pacific Northwest National Lab., Richland, WA (United States); and others
The authors have studied the reaction of NO with CO over a Rh(111) catalyst by monitoring the infrared (IR) intensity of surface CO and NO at various partial pressures of NO (P{sub NO}), CO(P{sub (CO)}), and sample temperatures (T). Reaction rates for the products (CO{sub 2}, N{sub 2}O, and N{sub 2}) were previously measured at the same conditions in this apparatus. Surface coverages were observed both at P{sub NO}=8 Torr, where the reaction yields mostly N{sub 2}O and the selectivity is insensitive to either P{sub CO} (1 to 40 Torr) or T(<673 K), and at P{sub NO}=0.8 Torr, where the major product changes from N{sub 2}O below 635 K to N{sub 2} above 635 K. Changes in the surface coverages of NO and CO correlate well with the observed changes in N{sub 2}O selectivity. Below 635 K, where N{sub 2}O formation is favored, NO dominates the surface. Above 635 K, Where N{sub 2} formation is preferred, CO is the majority surface species. The data support a model in which product N{sub 2}O and N{sub 2} are formed as adsorbed N reacts with either adsorbed NO or N, repectively. 75 refs., 14 figs.
- OSTI ID:
- 486388
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 164; ISSN JCTLA5; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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