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X-ray photoelectron spectroscopy was performed to elucidate the catalytic activity of CH 4 oxidation on perovskite-type Ca(Mn 1Àx Ti x )O 3Àd synthesized at 1173 K in a flow of oxygen from a gel with citric acid and ethylene glycol. The Mn ion content decreases and the ratio of the Mn 31 ion in the Mn ion increases with increases in x. Ca(Mn 1Àx Ti x )O 3Àd has a high catalytic activity of CH 4 oxidation at x 5 0.4. These results indicate that the catalytic activity strongly depends on the Mn 31 ion content of the surface.

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