Raman spectroscopic study of the Pt–CeO2 interaction in the Pt/Al2O3–CeO2 catalyst

Abstract

Raman spectra have been obtained from a series of Pt/Al₂O₃ catalysts containing from 0 to 20% CeO₂, and a Pt/CeO₂ catalyst, prepared by sol–gel processing. Spectra were recorded following calcination of the catalyst precursors at various temperatures up to 600 °C and compared with thermogravimetric data. The results clearly present evidence for a strong interaction between Pt and CeO₂. The surface mixed oxide species persists in an oxidising environment up to 600 °C and in a reducing environment up to 170 °C.