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Bulletin of the Chemical Society of Ethiopia

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

Hua Zhong, Xi-Rui Zeng

Abstract


Perovskite-type La2 –xSrxCoO4 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.



http://dx.doi.org/10.4314/bcse.v21i2.21207
AJOL African Journals Online