SURFACE COMPOSITIONS AND ACTIVITIES OF CATALYSTS STUDIED WITH X-RAY PHOTOELECTRON SPECTROSCOPY: sec-BUTANOL CONVERSIONS ON SnO2–MoO3 BINARY OXIDE CATALYSTS
The surface compositions of SnO2–MoO3 catalysts were determined using XPS and compared with the activities for sec-butanol. Surface enrichment of MoO3 occurred in the composition range of Mo/Mo+Sn < ca. 0.6, while SnO2 was enriched in the other catalysts. The activities were understood better in terms of the surface composition of the catalyst.