Method for preparing cobalt-based Fischer-Tropsch synthetic catalyst

Abstract

The invention discloses a method for preparing a cobalt-based Fischer-Tropsch synthetic catalyst, which comprises a preparing process of the cobalt-based Fischer-Tropsch synthetic catalyst and a process of hydrothermal treatment. In the preparing process of the cobalt-based Fischer-Tropsch synthetic catalyst, an active component, i.e. cobalt and an addition agent are loaded to a catalyst carrier by adopting an immersion method; and the process of hydrothermal treatment comprises the step of carrying out the hydrothermal treatment for 0.5-2h by using water vapor at the temperature of 150-600 DEG C. According to the cobalt-based Fischer-Tropsch synthetic catalyst prepared through the method disclosed by the invention, the initial activity of the catalyst is lowered, so that the initial stage of reaction is easy to control; and meanwhile, the activity of the catalyst in a stable stage is improved, and thus, the long-term use of the catalyst is facilitated.

Description

technical field [0001] The invention relates to a preparation method of a cobalt-based Fischer-Tropsch synthesis catalyst. Background technique [0002] The conversion of synthesis gas, ie carbon monoxide and hydrogen, into high value products is well known and has been used in industry for many years. Typical processes include: methanol synthesis, higher alcohol synthesis, hydroformylation and Fischer-Tropsch (Fischer-Tropsch) synthesis. Fischer-Tropsch synthesis refers to the reaction in which synthesis gas is catalyzed on a catalyst to synthesize hydrocarbon liquid fuels. With the increasing depletion of petroleum resources, the preparation of liquid fuels by Fischer-Tropsch synthesis has attracted more and more attention from all over the world. Catalyst is one of the key technologies of Fischer-Tropsch synthesis reaction. In the research of Fischer-Tropsch catalysts in the past 80 years, it has been found that Fe, Co and Ru are effective active components of Fischer-...

AI Technical Summary

Problems solved by technology

[0004] For Fischer-Tropsch synthesis supported cobalt-based catalysts, although the activity of the catalyst can be improved by different methods, it is unavoidable that there is a process of rapid catalyst deactivation in the early stage of the reaction, and then reaches a stable period of activity, often the higher the activity The faster the initial activation and deactivation rate is, it is unfavorable for the catalyst to maintain a higher catalytic activity in the stable activity period.

The reaction pressure of the Fischer-Tropsch synthesis process is in the range of 0.5-4MPa, and the increase in pressure is beneficial to the Fischer-Tropsch synthesis, so the reaction pressure used is mostly above 2.0MPa, and the pressure of the system is mostly maintained by the partial pressure of the synthesis gas. Too high initial activity and initial rapid deactivation are very unfavorable to industrial operations, and too high initial conversion of syngas leads to a large amount of product water, which is difficult to be taken away quickly, causing system moisture The increase in pressure accelerates the deactivation of the catalyst

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