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DOI: 10.1039/A901578G (Paper) Reference Section for: Phys. Chem. Chem. Phys., 1999, 1, 3039-3045

Reactivity and characterization of adsorbed oxygen on SrTi1-xMgxO3-δ catalysts for oxidative coupling of methane

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Keiichi Tomishige, Xiao-hong Li and Kaoru Fujimoto

Abstract

The reactivity of oxygen species adsorbed on SrTi1-xMgxO3-δ catalysts with methane was investigated. Temperature programmed desorption of oxygen, temperature programmed surface reaction of methane, and electron spin resonance were used for the characterization of oxygen species. It is suggested that the adsorption site is formed by the substitution of Ti4+ in Sr–Ti perovskite-type oxides with added Mg2+. It was found that this oxygen species was able to convert methane to ethane at a temperature as low as 550 K. Without CO2 on the surface, C2 hydrocarbons were formed with high selectivity in the CH4+O2 reaction. On the other hand, CO and CO2 were formed on the catalyst with CO2 pre-adsorption.

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