: Production of new material with novel specification and structure is the most important outcome of nanotechnology. These materials will increase efficiency of industrial processes. In so far the interest in their respects derives from the drastic change that electric, magnetic, catalytic and optical properties undergo when the size of a material is reduced from infinite to nanometric dimensions. With new policy in reducing environmental pollution, there are many ongoing researches in producing new catalyst to diminish contamination of fuel to environmental standards. The objective of this thesis was to reach to an optimum method to produce a catalyst with novel specification and high activity. Common methods in producing desulfurization catalyst are deposition of active phase on a support such as alumina or mesoporous materials by impregnation method. In this research two new methods was used to produce WS 2 supported MCM-41 catalyst. In the first method, synthesis of nanoparticles by reverse micelle method was followed by uv/vis spectroscopy. MCM-41 was synthesized with hydrothermal method. Effect of ultrasonic waves on reverse micelle and impregnation of nanoparticle into MCM-41 pores was studied. Elemental analysis of prepared catalyst showed presence of tungsten and sulfur in solid. In the other method, precursor of active phase was added to the gel of precursor of MCM-41. In order to compare the outcome of two methods, XRD, ASAP (BET, BJH), XRF and EDAX analysis were carried out. In order to survey the catalyst activity in the reaction conditions, a catalyst with 15 percent Ni-W supported on MCM-41 was prepared by second proposed method and was evaluated in hydrodesulphurization of Tehran oil refinery naphtha.The results showed that nickel-tungsten supported on MCM-41 synthesized by direct hydrothermal method led to removal of 98 percent of sulfur from naphtha. Keywords : nanoparticle, tungsten disulfide, microemulsion, MCM-41, hydrodesulfurization
