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Sulfur concentrations of gasoline and gas oil are now regulated to less than 10 ppm. However, stricter regulations are likely in the near future, so HDS catalysts must be further developed to reduce the cost of fuel production, and to provide ultra-deep desulfurized naphtha or kerosene for hydrogen production for use in fuel cells. In fact, the sulfur content of fuel oil for ships in the Baltic Sea and North Sea is already limited to 1.0 %. Similar regulations will soon be introduced in many other maritime areas, so hydrodesulfurization of gas oil, diesel oil and fuel oil for ships will become more and more important. Therefore, further development of hydrodesulfurization catalysts has continued, especially to identify more active and selective catalyst components1),2). Conventional HDS catalysts consist of MoS2 planes containing Ni or Co atoms (‘NiMoS’ or ‘CoMoS’ phase) supported on a carrier, usually γ-alumina. The performance of these CoMoand NiMo-based catalysts can be improved by adding further elements such as fluorine3), phosphorus4) or boron4),5). The use of other active phases such as WS2, CrSx, noble metals9)~15), as well as other carriers such as TiO2 or mixed oxides16)~21) or carbon22) and zeolites23) has also been investigated. The sol-gel method enables the preparation of porous materials with fine structure and polycrystalline materials with uniform composition from more than one component at low temperature. Active components Mo and Co in HDS catalysts supported on Al2O3 are usually prepared by an impregnation method. Using the solgel method, these active species can be added to an intermediate gel during preparation of the support, so very active catalysts with highly dispersed metals may be obtained. Mo/Al2O3 HDS catalysts have been prepared by the sol-gel method24), but examples for HDS application are rare. The present study investigated the HDS properties of Al2O3-supported Co_Mo catalysts prepared by the solgel method, for comparison with catalysts prepared by conventional impregnation methods. 103 Journal of the Japan Petroleum Institute, 58, (2), 103-109 (2015)

Preparation of Alumina-supported Cobalt–molybdenum Catalysts by Sol-gel Method and Hydrodesulfurization Activities