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Zinc Incorporated Hydroxyapatite Catalysts: Preparation and Characterization

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Ca-hydroxyapatite was freshly prepared by precipitation method and used as a support material for preparing zinc catalysts. The catalysts were prepared by two different techniques: incipient impregnation and ionic exchange. The freshly prepared zinc catalysts were characterized via X-ray diffraction pattern, Fourier transform infra-red spectroscopy, differential scanning calorimeter, and thermo-gravimetric analysis. The replacement of Ca2+ by Zn2+ for the catalyst prepared by the ionic exchange method and the formation of Zn oxide species after impregnation were confirmed by X-ray diffraction patterns. The evaluation of the catalytic activity of Zn-hydroxyapatite catalysts were investigated toward oxidative desulphurization reaction of gas oil. The results show that the sulfur removal reached 88.5 wt% over ionic exchanged zinc catalyst under mild conditions.
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Keywords: catalysts; hydroxyapatite; impregnation; ionic exchange; oxidative desulphurization; zinc

Document Type: Research Article

Affiliations: Egyptian Petroleum Research Institute, Nasr City, Hai Al-Zehour,Cairo, Egypt

Publication date: March 1, 2013

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