Preparation method of high-activity molybdenum sulfide hydrogenation catalyst

Abstract

The invention discloses a preparation method of a high-activity molybdenum disulfide (MoS2) hydrogenation catalyst. The method comprises the following steps: dissolving or dispersing a certain amountof molybdenum source and reductive sulfur source in a high-viscosity solution, and adding a reducing agent to obtain a solution or turbid liquid; regulating and controlling the types of the molybdenumsource, the sulfur source and a solvent; putting the prepared solution or turbid liquid into a closed stainless steel reaction kettle, and controlling the reaction temperature to be 120-220 DEG C andthe reaction time to be 3-72 hours; and after the reaction is finished, cooling, separating, washing and drying to obtain the high-activity MoS2 hydrogenation catalyst. The synthesis method disclosedby the invention has the advantages of low temperature, low pressure, no need of adding an additional reducing agent and the like, and the prepared MoS2 hydrogenation catalyst has the advantages thatthe interlayer spacing is enlarged, the accumulation degree is less than 3 layers, and the lamellar length is shorter than 10nm, so that the highest hydrogenation active site exposure rate is achieved. The high-activity exposed nano MoS2 hydrogenation catalyst synthesized by the method disclosed by the invention has extremely high catalytic hydrogenation activity in the field of catalytic hydrogenation of oil products.

Description

technical field [0001] The invention relates to a preparation method of a highly active molybdenum sulfide hydrogenation catalyst, which belongs to the field of controllable preparation of high-efficiency nanometer catalysts and catalytic hydrogenation. Background technique [0002] MoS 2 It is a two-dimensional layered compound with semiconductor properties. Two layers of S atoms sandwich a layer of Mo atoms to form a "sandwich" sandwich structure. Mo atoms and S atoms in the layer are covalently bonded. S-Mo-S The layers are combined by weak van der Waals forces. 2H-type MoS exists stably in nature 2 : Six sulfur atoms are arranged around each Mo atom to form a triangular prism coordination structure, and there are two S-Mo-S layers stacked in each unit cell. (Ding Q. et al., Chem, 2016, 1, 699-726) Due to its unique layered structure and excellent optical, electrical and mechanical properties, MoS 2 Materials are widely used in the fields of catalysis, lubrication, op...

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Problems solved by technology

Although the catalyst prepared by this method already has a smaller size and a lower packing degree, it does not maximize the exposure of the hydrogenation active sites of the catalyst.

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