High-dispersion heavy-hydrocarbon Fischer-Tropsch synthetic catalyst based on carbonization processing method and preparation method thereof

Abstract

The invention discloses a high-dispersion heavy-hydrocarbon Fischer-Tropsch synthetic catalyst based on a carbonization processing method and a preparation method thereof. The preparation method of the high-dispersion heavy-hydrocarbon Fischer-Tropsch synthetic catalyst comprises the following steps: loading a soluble salt of a metal additive on a formed carrier by using an impregnation method, drying and roasting to obtain a pre-processed carrier; loading a soluble cobalt salt and an organic matter on the pre-processed carrier by using the impregnation method, and drying to obtain the catalyst. According to the preparation method, a process of carbonization processing is introduced into a conventional evaluation step of reduction-Fischer-Tropsch synthesis of the catalyst, and the evaluation step is optimized as a step of reduction - synthesis gas processing - carbonization - H2 reprocessing, so the Co average grain size of the catalyst through the above actions is reduced. The secondary reduction is performed on the carbonized catalyst, the excess carbon deposition is eliminated, and thereby the Fischer-Tropsch reactivity of the catalyst is improved. Through the secondary reduction, the grain size is reduced, the activity point location is increased, and the reduction degree of the catalyst is further improved, so the performance of the catalyst is improved.

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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