SURFACE PROPERTIES AND CATALYTIC PERFORMANCE OF Pt/LaSrCoO4 CATALYSTS IN THE OXIDATION OF HEXANE

Abstract

Perovskite-type La_{2 –x}Sr_xCoO₄ mixed oxides have been prepared by calcination at various temperatures of precipitates obtained from aqueous solutions in the presence of citric or ethylenediamintetraacetic (EDTA) acids, and have been studied by X-ray diffraction (XRD), surface area (BET) measurements, temperature programmed desorption (TPD), temperature programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS). These oxides are catalysts for hexane oxidation, with the greatest activity for LaSrCoO₄ calcined at 750 C. This has extensive oxygen vacancies and large internal surface area. Pt-modified LaSrCoO₄ catalysts are significantly more active than the Pt-free system. Both surface and bulk phases of the preovskitetype oxides contribute to hexane oxidation.

KEY WORDS: Perovskite-type A₂BO₄, Surface properties, Catalytic performance, Temperature programmed desorption (TPD), Temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS), Hexane oxidation


Bull. Chem. Soc. Ethiop. 2007, 21(2), 271-280.