Catalyst for directly preparing low-carbon olefin from microspherical synthesis gas, as well as preparation method thereof

Abstract

The invention relates to a catalyst for directly preparing a low-carbon olefin from a microspherical synthesis gas, and is mainly used for solving the problems that the existing co-precipitation Fischer-Tropsch catalyst preparation technology comprises the following steps: firstly co-precipitating and then pulping and spray-forming, so that the slurry is substantially a non-homogenous body dispersed by adopting a physical method, the finial catalyst finished product is uneven and the hydrocarbon products on the catalyst are widely distributed. The problems are well solved by adopting the technical scheme that the preparation method comprises the following steps: firstly precipitating a part of components, then carrying out peptization on the obtained precipitates by using the salt solution of non-precipitated components to obtain chemically evenly dispersed sol, then spray-drying the sol, and then roasting at high temperature. The preparation method can be used for industrial production for a catalyst for synthesizing the low-carbon olefin from the synthesis gas. The catalyst is applicable to but not limited to such reactors as a fluidized bed and a slurry-state bed in which catalyst grains are required to be distributed according to the certain distribution rule.

Description

technical field [0001] The invention relates to a catalyst for directly preparing low-carbon olefins from microspherical synthesis gas and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the demand for petroleum resources and its products is increasing day by day. my country's energy is characterized by rich coal, little gas, and oil shortage. Lack of oil resources and insufficient domestic oil supply have become a severe reality for my country's energy development. With the development of the national economy, the contradiction between oil supply and demand will continue to expand, and get rid of the energy structure. The dependence on oil resources has become an urgent problem to be solved. This has just prompted people to actively and diligently develop other alternative energy sources, and the environmental pollution caused by the direct combustion of coal has also been paid more and more attention. The dev...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is the uneven distribution of the catalyst in the process of preparing the iron-based catalyst by the co-precipitation method existing in the existing Fischer-Tropsch technology, first co-precipitation, then beating, and then drying and forming, which finally leads to the problem of low selectivity of low-carbon olefins. A new microspherical catalyst and its preparation method are provided. The catalyst prepared by this method is evenly distributed microscopically, and the microstructure of the final catalyst can be controlled by controlling the conditions in the preparation process to improve the previous co-precipitation method. The problem of wide distribution of products on the catalyst for the synthesis of organic hydrocarbons from the obtained synthesis gas has the advantage of high selectivity of low-carbon olefins

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