Iron-based catalyst for direct coal liquefaction and preparation method thereof

Abstract

The invention discloses an iron-based catalyst for direct coal liquefaction and a preparation method thereof. The preparation method comprises: preparing an iron salt solution and an ammonia solution; making the iron salt solution and the ammonia solution enter a static mixer for a precipitation reaction to form a slurry mixture containing iron precipitation; making the slurry mixture containing iron precipitation enter an absorption oxidation reaction At the same time, the pulverized coal enters the absorption oxidation reactor, so that the mist and pulverized coal are mixed and absorbed by the pulverized coal; the pulverized coal that has absorbed the mist is subjected to the first hot air in the absorption oxidation reactor Quickly oxidize to undergo crystal phase transformation to generate iron oxide precursors; make the iron oxide precursors continue to undergo the pre-drying of the first hot air to form pre-dried catalysts; make the pre-dried catalysts enter the ball mill dryer, and undergo grinding and crushing at the same time Re-drying of the second hot air to form the catalyst. The method can obtain a more active coal direct liquefaction catalyst with lower cost, water consumption and energy consumption.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to an iron-based catalyst for direct coal liquefaction and a preparation method thereof. Background technique [0002] Coal direct liquefaction refers to a clean coal technology that converts coal into liquid products with the help of hydrogen-donating solvents and catalysts under high temperature and high pressure conditions. The main products of direct coal liquefaction are high-quality gasoline, jet fuel oil, diesel oil, aromatics and carbon chemical raw materials, and its by-products mainly include fuel gas, liquefied petroleum gas, sulfur and ammonia, etc., and the thermal efficiency of direct coal liquefaction is as high as 70%. Therefore, direct coal liquefaction to produce liquid fuel is an important way for clean and efficient conversion and utilization of coal. [0003] However, the direct coal liquefaction process is a complex physical and chemical process, and ther...

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Problems solved by technology

The catalysts prepared by these two methods all have high catalytic activity, but the water consumption of the catalysts prepared by these two methods is relatively high, and both involve the steps of filtration, which makes continuous production more difficult and equipment malfunctions The rate is high, and it is difficult to develop large-scale applications

[0008] Therefore, the preparation method of iron-based catalysts in the prior art mainly has the disadvantages of high water consumption, high energy consumption, and more waste water generation, and the preparation process is long and complicated, high in cost, difficult in continuous production, and not suitable for large-scale Develop application

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