Facile synthesis of Pt–Ce0.63Zr0·37O2–Y catalysts and the application in catalytic oxidation of toluene

Abstract

In this work, a series of Pt–Ce0.63Zr0·37O2–Y catalysts were prepared by unique simple mechanical mixing method. The catalytic activity of these catalysts for toluene oxidation was investigated. The physicochemical properties of the catalysts were characterized by XRD, ICP-MS, SEM, TEM, XPS and N2 sorption. Pore size distribution was analyzed according nitrogen adsorption and desorption isotherms. The catalytic results showed that using NaY as support for Pt–Ce0.63Zr0·37O2–Y could enhance the conversion of toluene during the oxidation process in comparison with HY. Further mixing cerium zirconium solid solution with Pt–NaY can improve the oxidation catalytic property of these catalysts. The conversion of toluene over Pt–Ce0.63Zr0·37O2–NaY reached more than 90% at 200 °C. High catalytic stability was obtained for toluene oxidation over Pt–Ce0.63Zr0·37O2–NaY. Platinum, cerium and zirconium can be uniformly dispersed on Y zeolite with small particle size by simple mechanical synthesis. The effect of drying methods on catalytic activity and hydrothermal stability of catalysts were also investigated in this research.