This work examines the influence of the Ce/Fe ratio in Pt/CeO2-Fe2O3 catalysts on the peculiarities of metal–support interaction and catalytic properties in the total oxidation of toluene. The physical-chemical properties of the Pt/CeO2-Fe2O3 catalysts are studied using low-temperature N2 adsorption–desorption, XRD, TPR-H2, Raman, and TEM. The citrate method to synthesize the mixed CeO2-Fe2O3 supports makes it possible to obtain dispersed defective oxide particles that actively interact with the supported Pt species. An increase in the oxygen mobility of CeO2-Fe2O3 after the Pt deposition and the cooperation of active oxidative species with the active site of Pt is a key to the catalytic activity in the total oxidation of toluene. This effect is the highest for the Pt/3Ce2Fe catalyst, and the temperature of 50% toluene conversion over this catalyst is 167 °C.
Savel’eva et al. (Thu,) studied this question.