Methane oxidative coupling over nonstoichiometric bismuth -tin pyrochlore catalysts
- Univ. of Toronto (Canada)
- Exxon Research and Engineering, Annandale, NJ (United States); and others
A series of expanded pyrochlore oxides Bi{sub 2}Sn{sub 2{minus}x}Bi{sub x}O{sub 7{minus}x/2} (O{le} x {le} 0.86) was synthesized and the influence of their composition on their performance as methane coupling catalysts was examined. A trend to higher selectivity and lower activity accompanies increases in x. However, analysis of the kinetic data by a simple procedure which separates the catalyst activity and selectivity shows that all the catalysts have similar intrinsic surface selectivities, independent of composition. The trend in observed selectivity is an indirect effect of variations in activity. The similarity in surface selectivity is attributed to the formation of a bismuth-oxide-rich surface layer in all materials upon heating to reaction temperatures. 47 refs., 10 figs., 1 tab.
- OSTI ID:
- 96280
- Journal Information:
- Journal of Catalysis, Vol. 153, Issue 2; Other Information: PBD: May 1995
- Country of Publication:
- United States
- Language:
- English
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