Nickel phosphide catalyst, method for preparing same and application of nickel phosphide catalyst

Abstract

The invention relates to a nickel phosphide catalyst, a method for preparing the same and application of the nickel phosphide catalyst. The method includes steps of dissolving nickel acetate and phosphorus sources in water to obtain suspension, adding concentrated nitric acid into the suspension to obtain clear solution, then adding MCM-41 mesoporous molecular sieves into the clear solution, soaking the MCM-41 mesoporous molecular sieves in the clear solution, drying the MCM-41 mesoporous molecular sieves and then calcining the MCM-41 mesoporous molecular sieves to obtain precursors; placing the precursors in a fixed-bed reactor, heating the fixed-bed reactor in hydrogen flow until the temperature of the fixed-bed reactor reaches 350-600 DEG C, preserving heat for 1.5-2.5 h, then cooling the fixed-bed reactor until the temperature of the fixed-bed reactor reaches the room temperature, and then carrying out passivating treatment to obtain the nickel phosphide catalyst. The nickel phosphide catalyst, the method and the application have the advantages that the nickel acetate is used as a nickel source, accordingly, inorganic salt difficult to volatilize can be prevented in synthetic reaction procedures, and procedures for preparing the nickel phosphide catalyst can be simplified to a great extent; organic nickel acid is used as the nickel source, effects of promoting reduction of nickel phosphide can be realized by organic acid radicals, and accordingly the problem of high reduction temperatures and energy consumption in existing procedures for preparing existing nickel phosphide catalysts can be effectively solved.

Description

technical field [0001] The invention relates to a nickel phosphide catalyst and its preparation method and application. Background technique [0002] In recent years, with the improvement of people's awareness of environmental protection, efficient oil desulfurization technology has attracted much attention. Fuel oil desulfurization technology has gradually shifted to the field of deep desulfurization and ultra-deep desulfurization, and the current commercial hydrodesulfurization (HDS) catalysts have been difficult to meet this requirement. Therefore, improving the original sulfide catalysts and finding new high-efficiency substitutes have become the focus of recent research by researchers. Ni 2 P is a material with high hydrodesulfurization activity discovered in recent years. Under the same test conditions, Ni 2 P / SiO 2 Catalyst activity ratio NiMo / Al 2 o 3 and CoMo / Al 2 o 3 Both are high, and the order of activity of similar phosphides is: Ni 2 P>WP>MoP>...

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Problems solved by technology

Therefore, after the synthesis reaction, it is necessary to remove the non-volatile inorganic salts generated during the reaction process. When using chlorine-containing reagents, it is necessary to remove the residual chlorine on the surface of the solid catalyst. Not only is the process complicated, but also the in-situ synthesis of the catalyst-hydrodesulfurization reaction cannot be realized.

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