Cobalt-based Fischer-Tropsch synthesis catalyst and its preparation method and application

Abstract

The invention discloses a cobalt-base Fischer-Tropsch synthesis catalyst and a preparation method and application thereof. The catalyst comprises a mesoporous carbon carrier and an active component cobalt, wherein the active component cobalt is confined in the mesoporous carbon carrier. The catalyst has specific surface area of 220-400 m<2> / g and particle diameter of 50-150 um. The preparation method employs phenolic resin solution as an organic precursor, and then a sol-gel method is employed to embed the active component Co into the mesoporous carbon carrier. The catalyst prepared by the invention before usage only requires introduction of inert gas into at a certain temperature without hydrogen reduction, so as to obtain the catalyst containing cobalt. The catalyst of the invention has the advantages of high reduction degree, high dispersity, good stability, uniform size of active component, controllable carrier aperture and high selectivity on diesel, and can meet the requirements of a slurry bed reactor on the wear resistance of the catalyst.

Description

technical field [0001] The invention relates to the field of industrial catalytic Fischer-Tropsch synthesis, in particular to a cobalt-based Fischer-Tropsch synthesis catalyst and its preparation method and application. Background technique [0002] Fischer-Tropsch synthesis means that the main component made from coal or natural gas is H 2 The reaction process of synthesizing the synthesis gas with CO and CO under the catalysis of the catalyst to synthesize hydrocarbon liquid fuel is one of the important links to realize the indirect coal liquefaction technology. Fischer-Tropsch synthesis products have the advantages of no sulfur, no nitrogen, and low aromatic content, and have more development potential in today's increasingly serious environmental pollution. The development of catalysts with high activity, high product selectivity and high stability is one of the key technologies of Fischer-Tropsch synthesis. There are many kinds of catalysts used in Fischer-Tropsch syn...

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Problems solved by technology

[0004] In summary, the existing cobalt-based Fischer-Tropsch synthesis catalysts mainly have the following disadvantages: 1) The existing synthetic oil process route generally needs to go through heavy hydrocarbons, and then rehydrofining to obtain diesel oil, the process is lengthy and the energy consumption is high , the reaction product is distributed in ASF, which makes the selectivity of gasoline and diesel components in the product very low; 2) The higher the dispersion of the catalyst active phase, the catalytic activity will be improved accordingly, and the smaller the dispersion of cobalt oxide particles The higher, but the smaller the particles, the stronger the interaction with the carrier, and the less likely to be reduced. Therefore, it is difficult for existing cobalt-based Fischer-Tropsch synthesis catalysts to have both high reduction and high dispersion; 3) with the slurry bed The development of reactor synthetic oil technology has put forward higher requirements for the anti-wear performance of cobalt-based Fischer-Tropsch synthesis catalysts. The anti-wear performance of existing cobalt-based Fischer-Tropsch synthesis catalysts is not ideal enough, resulting in the loss of catalyst active components or Cracking will reduce the catalytic performance and service life, reduce the product quality and yield, and the worn catalyst will pollute the product, increasing the difficulty of refining downstream products

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