A highly dispersed heavy hydrocarbon Fischer-Tropsch synthesis catalyst based on a carbonization treatment method and its preparation method

Abstract

The invention discloses a highly dispersed heavy hydrocarbon Fischer-Tropsch synthesis catalyst based on a carbonization treatment method and a preparation method thereof. The preparation method of the highly dispersed heavy hydrocarbon Fischer-Tropsch synthesis catalyst comprises the following steps: using an impregnation method to load a soluble salt of a metal additive on a shaped carrier, and obtain a pretreated carrier through drying and roasting; And the organic matter is loaded on the pretreatment carrier, and it is obtained after drying. The present invention introduces the process of "carbonization" treatment in the evaluation step "reduction-Fischer-Tropsch synthesis" of conventional catalysts, and optimizes it to "reduction-synthesis gas treatment-carbonization-H 2 After the above-mentioned catalyst, the average grain size of Co decreases; the carbonized catalyst undergoes a second reduction to remove excess carbon deposits, thereby improving the Fischer-Tropsch reaction activity of the catalyst; after the second reduction, not only the crystal The particle size is reduced, the active sites are increased, and the reduction degree of the catalyst will be further improved, which leads to the improvement of the catalyst performance.

Description

technical field [0001] The invention relates to a highly dispersed heavy hydrocarbon Fischer-Tropsch synthesis catalyst based on a carbonization treatment method and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] The Fischer-Tropsch synthesis (FTS) process is a chemical process that converts synthesis gas into hydrocarbons, and is one of the most important ways to efficiently convert and utilize non-petroleum carbon-containing resources (natural gas, coal, residual oil, and biomass, etc.). Syngas generates a series of hydrocarbons with different carbon numbers under the action of catalysts (C 1 ~C 200 ), mainly straight-chain alkanes, and some low-carbon olefins and alcohols are obtained at the same time. The initial product is further processed (such as separation, hydrocracking or hydroisomerization, etc.) to obtain certain specifications of gasoline, diesel and other oil fuels, as well as chemicals s...

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Problems solved by technology

[0005] The above-mentioned modification methods have made significant progress in improving the activity of cobalt-based Fischer-Tropsch synthesis catalysts, product selectivity, long-term operation stability and reactor adaptability, but still have not taken into account the performance of the above aspects at the same time. There is still a strong chemical interaction between the carrier and the active center cobalt, forming a compound that is difficult to reduce, and the dispersion is poor, which reduces the activity and selectivity of the catalyst, making CH 4 The content in the reaction product increases, C 5 + Reduced selectivity

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