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Title: Effect of calcination temperature of TiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> mixed oxides on hydrodesulphurization performance of Au-Pd catalysts
Authors: Gu, Zhonghua
Luo, Laitao
Chen, Sufen
Keywords: Calcination effect
Mixed oxides
Au-Pd catalysts
Issue Date: Mar-2009
Publisher: CSIR
Abstract: A series of TiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> mixed oxides calcined at different temperatures was prepared by the sol-gel method. The influence of calcination temperature of TiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> on Au-Pd catalysts was investigated in the hydrodesulphurization of thiophene. The structural and surface properties of the samples were analyzed by nitrogen adsorption, X-ray diffraction, temperature-programmed desorption, temperature-programmed reduction and infrared spectroscopy techniques. The results showed that the prepared TiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> mixed oxides had mesoporous structure. The TiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> mixed oxide calcined at 773 K exhibited larger BET surface area, pore volume and more acid sites than the samples calcined among 873-1073 K. All the Au-Pd catalysts supported TiO<sub>2</sub>-Al<sub>2</sub>O<sub>3 </sub>calcined at different temperature had higher catalytic activity towards the hydrodesulphurization of thiophene, and the catalytic activity of Au-Pd/TiO<sub>2</sub>-Al<sub>2</sub>O<sub>3 </sub>(773 K) was better than that of other samples in hydrodesulphurization reaction. This was explained in terms of their structure: interaction between Au-Pd and TiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>, dispersion, apparent activation energy, the number of Au<sub>x</sub>Pd<sub>y</sub> alloy particles and acid sites.
Description: 175-180
ISSN: 0971 – 457X
Appears in Collections:IJCT Vol.16(2) [March 2009]

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