Layered composite hydrodesulphurization catalyst and preparation method

Abstract

The invention relates to a layered composite hydrodesulphurization catalyst and a preparation method. With nickel-molybdenum-tungsten composite sulfide as a catalytic active component and organicallymodified layered clay as a carrier, nickel-molybdenum-tungsten composite sulfide nanoparticles are prepared by adsorption, coordination, impregnation, drying, extrusion, roasting and vulcanization, the nickel-molybdenum-tungsten composite sulfide nanoparticles are uniformly dispersed into the layered structure of the clay, forming the layered composite hydrodesulphurization catalyst, wherein the molar ratio of nickel to molybdenum to tungsten is (4.5 to 5.5) to (0.15 to 1.2) to 1, and the total mass content of the nickel, molybdenum and tungsten elements in the layered composite hydrodesulphurization catalyst is 28 to 45 percent. The desulphurization efficiency of the novel, efficient and stable hydrodesulphurization catalyst is up to 99 percent or above, and the layered composite hydrodesulphurization catalyst is particularly applicable to the removal of sulfur in petroleum products.

Description

technical field [0001] The invention relates to a hydrodesulfurization catalyst, in particular to a layered composite hydrodesulfurization catalyst and a preparation method thereof, which belong to the field of catalytic materials and air pollution control, and are especially suitable for deep desulfurization of petroleum products. Background technique [0002] The Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine issued the "Light-duty Vehicle Pollutant Emission Limits and Measurement Methods (China's Sixth Stage)" (referred to as the National Sixth Standard for Light-duty Vehicles), and announced the latest emission requirements and implementation time. In order to provide a certain buffer period for the upgrading of the automobile industry, the country has formulated two phase requirements of China VI A and China VI B (China VI A is equivalent to the transition stage between China V and China VI, and China...

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Problems solved by technology

Zhang Lei, Fu Wenqian, YuQuanyong, Tang Tiandi, Zhao Yicheng, Zhao Huawang, Li Yongdan, Journal of Catalysis, 2016, 338, 210-221 reported the synthesis of a layered zeolite molecular sieve (MOR) as a carrier, and phosphating the active component Nickel nanoparticles are uniformly dispersed in the sheet molecular sieve structure, showing good hydrodesulfurization activity and stability; CN103769121A discloses a preparation method of a hydroprocessing catalyst, which performs high-temperature hydrothermal modification on clay under acidic conditions treatment, and then use aluminum-containing acidic solution and alkaline solution to reprocess the modified clay to prepare a catalyst carrier, and finally introduce active components through impregnation or kneading to prepare a hydrodesulfurization catalyst. The catalytic desulfurization efficiency is not high

The hydrodesulfurization catalysts prepared by the above different methods either require high-cost layered zeolite molecular sieve supports, or the modification process of the supports is complicated and cumbersome, and the desulfurization efficiency of the catalysts is not high

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