Highly dispersed coal/heavy oil hydrogenation co-refining catalyst prepared by carrier coal modification

Abstract

The invention discloses a highly dispersed coal / heavy oil hydrogenation co-refining catalyst prepared by carrier coal modification, belongs to the technical field of coal-heavy oil hydrogenation co-refining, and is a highly dispersed catalyst taking coal powder subjected to pore-forming pretreatment as a carrier and taking metal iron nickel as an active component. The preparation method of the catalyst comprises the following steps: carbonizing raw material coal powder; fully mixing and uniformly stirring the carbonized material and an activating agent, and maintaining the temperature at 750-850 DEG C for 60 minutes; washing to be neutral, and drying to obtain a porous material; uniformly stirring and mixing the porous material and the iron-nickel mixed salt solution; dropwise adding an alkaline solution to generate precipitate; introducing air for oxidation reaction; and carrying out reduced pressure suction filtration, washing, vacuum drying, grinding and screening to obtain the product. The coal powder is subjected to activation pretreatment, so that the specific surface area of the coal powder is increased, the dispersity of the active components on the surface of the coal powder is improved, the loading capacity of the active components is improved, and the dispersion process of the catalyst in the conventional coal-oil suspended bed hydrogenation co-processing is greatlysimplified.

Description

technical field [0001] The invention relates to the technical field of coal-heavy oil hydrogenation co-smelting, in particular to a carrier coal modification to prepare highly dispersed coal / heavy oil hydrogenation co-smelting catalyst. Background technique [0002] my country's national energy composition is mainly coal resources, but the direct combustion of a large amount of coal will bring a heavy burden to the environment. Oil and natural gas resources are relatively scarce, crude oil is heavy and inferior, and the demand for light oil is increasing. With economic development, my country's dependence on foreign crude oil is increasing year by year. Therefore, in coal-rich and oil-poor countries, kerosene co-refining technology It has attracted many researchers. The kerosene co-refining technology is a new type of direct coal liquefaction technology that uses petroleum heavy / inferior oil as solvent oil. It utilizes the synergy between coal powder and heavy oil to convert ...

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Problems solved by technology

[0004] At present, the dispersion methods are mainly divided into two types: one is the coal loading method introduced through coal blending, and the other is the oil-soluble method introduced through oil blending. Chuan Li et al. synthesized an oil-soluble iron-nickel catalyst and used it in The hydrogenation reaction performance of lignite Marui residual oil system was investigated, and it can be dispersed well when it is directly added to the reaction system. Among them, iron and nickel form a mixed crystal phase during the vulcanization process, so that the two metals have a synergistic effect. The dry base ash-free coal The conversion rate is as high as 97%, but the extensive use of oil-soluble ligands makes the synthesis cost high, and industrial application cannot be realized

Deng Wen'an et al. used lignite as a carrier to synthesize a coal-supported catalyst with Fe / Mo as an active component by impregnation method, and found that the addition of a second metal component can promote the improvement of coal conversion rate, and the particle size of the iron-based catalyst is less than 50nm , and the dispersion degree in the system is high, but the specific surface area of ​​the carrier coal is small, especially when the loading capacity is high, the active components are easy to gather and accumulate, and the dispersion degree needs to be improved

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