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Investigation of the Oxidizing Species in the V—Sb-Oxide Catalyst Prepared by the Sol-Gel Method

Y. H. Taufiq-Yap, I. Y.-P. Jong, M. Z. Hussein, and R. Samsuddin

Department of Chemistry, Universiti Putra Malaysia, 434 00 UPM Serdang, Selangor, Malaysia


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Abstract: The nature of the oxidizing species in V-Sb-oxide catalyst has been studied using transient kinetic techniques: temperature-programmed desorption and temperature-programmed reduction. Three strongly-bound molecular oxygen species having desorption peak maxima of 863 K, 940 K, and 1053 K were observed by temperature-programmed desorption. From both the high desorption activation energies and the total amounts of oxygen desorbed, it can be concluded that these oxygen species were originally from the lattice of V-Sb-oxide catalyst. Three peak maxima at 750 K, 786 K, and 911 K were observed in the rate of H2 consumption indicating the presence of three types of kinetically different oxygen states in the catalyst.

Full paper in Portable Document Format: 553a145.pdf


Chemical Papers 55 (3) 145–148 (2001)

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