Surface Composition of SnO2–ZrO2 Binary Oxide Catalyst and Its Selectivity for C3H6–NO Reaction

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Abstract
The relation between the composition of outermost surface layer on SnO2–ZrO2 binary oxide catalyst and catalytic selectivity in the C3H6–NO reaction has been investigated by XPS technique. The composition of outermost surface layer was estimated from a comparison of the intensity ratios of X-ray induced Auger peak or XPS peak of Sn to XPS peak of Zr. A superficial enrichment of Zr was observed in these catalysts calcined at 600 °C in the air, while surface enrichment of Sn took place during the course of evacuation at 450 °C. The catalytic selectivity for formation of acrylonitrile showed a maximum with the catalyst containing Sn and Zr in the same concentration at the outermost surface layer of catalyst.