Fischer-Tropsch synthesis catalyst and preparation method and application thereof

Abstract

The invention relates to a micro-spherical iron-based catalyst which contains transition metal additive, has high performance and is applicable to the Fischer-Tropsch synthesis of a slurry reactor, and a preparation method and the application thereof; and the weight composition of the catalyst is as follows: Fe: transition metal additive M: structural additive (SiO2 or / and Al2O3):K=100:1 to 50:1 to 50:0.5 to 10. The preparation method of the catalyst comprises the following steps: adding the structural additive into Fe / M mixed nitrate solution, co-precipitating with ammonia to prepare slurry; filtering and washing the slurry to obtain a filter cake; and adding the required amount of K additive and water into the filter cake, beating, spraying, drying and calcining to obtain the Fischer-Tropsch synthesis iron-based catalyst of the micro-spherical slurry reactor. The catalyst prepared by the method has good anti-wear performance, the distribution scope of the grain size of the catalyst is narrow, the synthesis gas conversion capability is high, the product selectivity is good and the time-space yield is high, and the Fischer-Tropsch synthesis reaction of the slurry reactor can be carried out within a wider scope of temperature simultaneously.

Description

technical field [0001] The present invention relates to a Fischer-Tropsch synthesis catalyst capable of performing slurry bed Fischer-Tropsch synthesis (Fischer-Tropsch synthesis, referred to as F-T synthesis) with high performance in a wide temperature range, a preparation method thereof and the preparation method of the catalyst in a slurry bed Fischer-Tropsch synthesis. applications in synthesis. Background technique [0002] Fischer-Tropsch synthesis is the synthesis gas (CO+H 2 ) into hydrocarbon products and other chemicals. Typical catalysts for syngas conversion involve Group VIII transition metals such as iron, cobalt, ruthenium and nickel. Among the catalysts of the above systems, ruthenium-based catalysts are expensive, and the methanation reaction of nickel-based catalysts is too serious. Only iron and cobalt-based catalysts have industrial development and application value. Among them, cobalt-based catalysts are suitable for H due to their weak water-gas shif...

AI Technical Summary

Problems solved by technology

However, no structural additives are added to the catalyst, and the catalyst has poor anti-wear ability, so it is not feasible for practical application, and the index data such as catalyst strength, space-time yield and production capacity cannot be provided.

U.S. Patent US4340503 provides a Fe-Mn fixed bed catalyst supported by molecular sieves, but the methane selectivity of the catalyst is high and the activity is low

[0005] Chinese patent CN1817451A provides a precipitation-type Fe / Cu / Cr / K / Na catalyst suitable for high-temperature fluidized bed Fischer-Tropsch synthesis operation, but the activity of the catalyst is low, at 350 ° C, 1400-1450ml / ml Catalyst / h, 2.5MPa conditions, with H 2 The synthesis gas with a / CO ratio of 3.0 is used as the raw material gas for evaluation, but the conversion rate of the synthesis gas is low (<50%), the product selectivity is poor, and the methane selectivity is greater than 10%

[0006] At present, there is no patent report on a high-performance catalyst with high activity, reasonable product distribution, and strong wear resistance that is particularly suitable for advanced slurry-bed Fischer-Tropsch synthesis. At the same time, the existing slurry-bed catalysts can only be used at relatively low temperatures. Operation (220-240°C), the operating temperature cannot be increased, which is not conducive to improving the overall energy conversion efficiency of the Fischer-Tropsch synthesis process

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