Abstract: Nano-mesoporous TiO2-Al2O3 complex supports were prepared by kneading method. The influence of the calcination temperature of support on the catalytic performance of Co-Mo catalyst was studied. The prepared catalyst samples were characterized by means of N2 adsorption, X-ray diffraction and pyridine adsorption FT-IR. The results indicated that the complex supports calcined at various temperatures were all mesoporous materials with mainly Lewis acid sites. With the increase of support calcined temperature, the specific surface area and pore volume of the catalyst decreased and the average pore diameter increased. In the catalyst the TiO2 particles existed as nanoparticles and its particle size increased with the increase of calcination temperature. The presence of Al2O3 in the complex support could significantly increase the transformation temperature of TiO2 crystal. The prepared catalysts were evaluated in a 10mL fixed-bed reactor and the test results showed that the catalysts prepared with supports calcined at suitable temperature exhibited high hydrodesulfurization activity and selectivity.

Key words: calcination temperature, hydrodesulfurization, TiO2-Al2O3, support