Abstract
The surface composition of tin-antimony mixed oxide selective oxidation catalysts has been found to depend upon heat treatment, the surface becoming progressively enriched in antimony at elevated temperatures. Surface segregation of antimony has been investigated by X-ray photoelectron spectroscopy (XPS) and values obtained for the heats of segregation. The observations are discussed in the context of the nucleation and growth of antimony oxide and tin oxide phases in this system.
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