A gasoline selective hydrodesulfurization catalyst and its preparation and application

Abstract

The invention relates to a gasoline selective hydrodesulfurization catalyst and preparation and application thereof. According to the total mass of the catalyst being 100%, the catalyst is prepared from 3-15 wt% of VIII group metal, 45-58 wt% of Mo and 35-40 wt% of S. A preparation method of the catalyst comprises the following steps that 1, a defect-rich molybdenum disulfide nanosheet precursor with a non-stoichiometric ratio is prepared; 2, one kind of VIII group metal is added into the molybdenum disulfide nanosheet precursor through an ultrasonic assisting dipping method, the molar ratio of the VIII group metal to Mo is (0.1-0.5):1, the specific surface area of the molybdenum disulfide nanosheet precursor ranges from 40 m<2> / g to 90 m<2> / g, the pore volume ranges from 0.1 ml / g to 0.25 ml / g, and the molar ratio of sulfur to molybdenum is (1.92-2.10):1. Defect-rich molybdenum disulfide is prepared by controlling the stoichiometric ratio of molybdenum disulfide, and meanwhile more active loci are exposed. Compared with an existing catalyst, the catalyst is applied to a gasoline selective hydrodesulfurization reaction, the hydrogenation saturation factor of olefin is low, and the hydrodesulfurization rate of a sulfur-containing compound is high.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and relates to a gasoline selective hydrodesulfurization catalyst and its preparation and application, in particular to a selective hydrodesulfurization solid-phase catalyst and its preparation method and its use in gasoline selective hydrodesulfurization reaction in the application. Background technique [0002] The problem of urban air pollution caused by motor vehicle exhaust is becoming more and more serious. Among them, sulfur oxides (SOx) produced by the combustion of sulfur compounds in gasoline can not only irreversibly poison the three-way catalyst of the engine exhaust purification system, but also be discharged into the atmosphere. It will also cause acid rain in the air, and cause particulate matter in the atmosphere, causing a series of problems such as an increase in the value of PM 2.5. With the improvement of people's awareness of environmental protection, countries have for...

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Problems solved by technology

The hydrodesulfurization selectivity of the catalyst is relatively improved, but the disadvantage is that its complicated and harsh carbon deposition process increases the difficulty of industrial operation and limits its industrial application

Chinese patents CN1339985A, CN101544904A, CN101153228A, CN101733120A and CN103657672A also disclose a preparation method of a NiMoW tri-metal bulk catalyst and its application in ultra-deep desulfurization of diesel oil, although the prepared catalyst shows However, when it is used in the hydrodesulfurization of gasoline, because the hydrogenation activity of this type of catalyst is too high, it will cause the saturation of a large amount of olefins, which limits its application in the selective hydrodesulfurization of gasoline.

[0012] (1) While the traditional hydrodesulfurization catalyst removes sulfur compounds in gasoline, it causes hydrogenation saturation of a large number of olefins in gasoline, resulting in a sharp drop in gasoline octane number and a large amount of unnecessary hydrogen consumption;

[0013] (2) The improvement of the selectivity of traditional supported catalysts is limited by the carrier;

[0014] (3) Most of the existing bulk catalysts are aimed at diesel components, have high hydrogenation activity, and easily cause a large amount of saturation of olefins, so they cannot be directly applied to the selective hydrodesulfurization reaction of gasoline;

[0015] (4) Most of the existing methods for preparing molybdenum disulfide by hydrothermal or solvothermal use reducing agent, surfactant or inorganic salt, which increases the complexity of preparation;

[0016] (5) The existing selective hydrodesulfurization process uses pre-distillation to separate light and heavy components, resulting in a lot of energy waste

[0017] At present, there are not many catalysts with high selectivity and high desulfurization rate for selective hydrodesulfurization of gasoline

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