Preparation method and application of coal catalyst

Abstract

The invention discloses a preparation method of a coal catalyst. The method comprises the following steps: mixing aluminum orthoarsenate and an ammonium phosphate solution, and calcining a mixture toobtain phosphorus-modified aluminum arsenate, mixing the phosphorus-modified aluminum orthoarsenate and an erbium acid ammonium solution to obtain a catalyst precursor, and then calcining the catalystprecursor to obtain the catalyst. The invention also discloses a method for catalyzing the hydropyrolysis of low metamorphic coal by using the catalyst, in the present invention, the aluminum orthoarsenate is firstly modified to obtain an acid-enhanced carrier, the active component erbium is then supported on the carrier, and the obtained catalyst can promote a catalytic cracking process of the coal macromolecule, the dispersion of the active component of the catalyst on the carrier is also improved, which promotes the catalytic hydrogenation and pyrolysis process of coal, and improves the tar yield of catalytic hydrogenation pyrolysis of low metamorphic coal.

Description

technical field [0001] The invention belongs to the technical field of coal catalysis, and in particular relates to a preparation method and application of a coal catalyst. Background technique [0002] The medium and low temperature pyrolysis technology of low-metamorphic coal is a new technology for coal quality conversion. Clean liquid fuels, chemicals, gas fuels and semi-coke can be obtained through coal pyrolysis. Compared with coal indirect liquefaction and direct liquefaction technologies, medium and low temperature Pyrolysis technology has the advantages of high energy conversion rate, low carbon dioxide emission, coal separation and polygeneration, etc. Medium and low temperature pyrolysis technologies for low-metamorphic coal mainly include vertical internal heat pyrolysis technology, vertical external heat pyrolysis technology, and solid heat carrier or gas heat carrier pyrolysis technology. The existing industrial coal pyrolysis technology has problems such as l...

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Problems solved by technology

Zou Xianwu et al. investigated the effect of Co / ZSM-5 molecular sieve on the yield of coal pyrolysis gas-liquid-solid products in a spouted-carried bed reactor. The results showed that Co / ZSM-5 molecular sieve catalyst can effectively regulate coal thermal The distribution of pyrolysis products greatly increased the yield of phenols, aliphatic hydrocarbons and aromatic hydrocarbons in coal pyrolysis products; Jia Yongbin et al. conducted experiments on CaO catalyzed coal pyrolysis in a fixed-bed fast pyrolyzer, and the results It was found that CaO promoted the secondary degassing reaction and reduced the tar production, but the production of gas components such as carbon monoxide, methane and hydrogen increased; our company found that the catalytic hydropyrolysis process of coal is mainly composed of the catalytic cracking process of coal macromolecules and The composition of the catalytic hydrogenation process of primary cracking products, the synergistic effect of these two processes was not well considered in previous research and development, usually only the catalytic hydrogenation process was considered, and the catalytic cracking process of coal macromolecules was ignored, resulting in coal catalytic hydrogenation Low tar yield after pyrolysis