Batch-preparation and quick-separation method of iron-based coal-liquefaction nano catalyst

Abstract

The invention provides a batch-preparation and quick-separation method of an iron-based coal-liquefaction nano catalyst. The batch-preparation and quick-separation method includes utilizing 0.01-0.1mol L-1 of FeCl3 solution as a raw material, hydrolyzing the FeCl3 solution within the temperature ranging from 70 DEG C to 80 DEG C for 6-12 hours to obtain nano FeOOH colloidal solution; utilizing fulvic acid iron and sodium humate and the like as flocculant, simply separating nano particles by the aid of the flocculant and accordingly realizing batch preparation of the nano FeOOH. The batch-preparation and quick-separation method is low in cost, simple to operate, pollution-free and capable of preparing in batch. The catalyst prepared is small in particle diameter which is within nano range and uniform in particle diameter distribution, direct liquefaction activity of coal catalyzing is high, conversion rate ranging from 83-95% and oil yield rate ranging from 70-82 can be realized by direct liquefaction of Xinjiang Yili coal catalyzing, and conversion rate ranging from 85-97% and oil yield rate ranging from 65-85% can be realized by direct liquefaction of catalyzing of coal of General Temple of Xinjiang.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for direct liquefaction of coal, in particular to a method for preparing an ultrafine and highly active nano-iron-based direct liquefaction catalyst for coal in an aqueous phase system, and using humate to separate nanoparticles to achieve batch preparation, which belongs to inorganic materials field. Background technique [0002] Coal direct liquefaction is a technology that hydrogenates coal macromolecules under the action of certain temperature, pressure and catalyst to crack them into small molecule gaseous hydrocarbons with high H / C ratio. [0003] After nearly a century of development, scientists from various countries have developed a variety of direct liquefaction processes to achieve industrial production, mainly including the IGOR process in Germany, the NEDOL process in Japan, the HIT process in the United States, and the Shenhua coal direct liquefaction process in my country. As on...

AI Technical Summary

Problems solved by technology

The disadvantage of ordinary iron-based catalysts is that their catalytic activity is not high. Studies have shown that the smaller the particle size of the catalyst, the better the dispersion in the direct coal liquefaction system, and the higher its catalytic activity.

Although a variety of iron-based catalysts with small particle sizes have been prepared, and iron-based catalysts with high activity have been obtained, there are still some shortcomings, such as expensive preparation of raw materials (such as organometallic compounds, organic solvents), and difficult preparation methods. Scale-up (such as laser pyrolysis), complex production process, and high cost of waste treatment

[0004] At present, the ideal preparation method is to synthesize iron-based catalysts through aqueous precipitation, which has low raw material cost and simple production process, but it is difficult to obtain catalysts with smaller particle sizes by direct precipitation.

In addition, nanoscale catalyst products are difficult to separate from the catalyst preparation system, making it difficult to achieve batch production, and improper separation will cause particle agglomeration, greatly reducing its catalytic activity

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