Cobalt-based Fischer-Tropsch synthesis catalyst with high heavy hydrocarbon selectivity as well as preparation method and application thereof

Abstract

The invention relates to the technical field of preparation of high-quality liquid fuel and chemicals by catalytic conversion of synthesis gas, and particularly discloses a cobalt-based Fischer-Tropsch synthesis catalyst with high heavy hydrocarbon (C<5+>) selectivity. In the catalyst, nano TiN is adopted as a carrier, cobaltosic oxide nanoparticles are loaded on the carrier; the particle size distribution range of the TiN particles is 18-48 nm, the particle size distribution range of the cobaltosic oxide particles is 6-14 nm, and the mass of the cobalt element in the catalyst accounts for 10%-15% of the mass of the catalyst. The cobalt-based Fischer-Tropsch synthesis catalyst provided by the invention is relatively wide in suitable reaction temperature range, and relatively low CH4 and CO2 selectivity and high heavy hydrocarbon selectivity can be maintained at a relatively high reaction temperature (240-300 DEG C).

Description

technical field [0001] The invention relates to the technical field of preparing high-quality liquid fuels and chemicals through catalytic conversion of syngas, in particular to a high-heavy hydrocarbon (C 5+ ) Selective cobalt-based Fischer-Tropsch synthesis catalyst and its preparation method and application. Background technique [0002] In recent years, the rapid consumption of petroleum resources has caused serious energy and environmental problems, and it is urgent to develop clean energy production technologies that can replace petroleum resources. Fischer-Tropsch synthesis (FTS) technology, which converts carbon-based raw materials such as coal, natural gas, biomass, and organic waste, into clean fuels and high value-added chemicals through syngas, has received extensive attention. The product selectivity of FTS reaction generally follows the ASF distribution, and the product composition is relatively complex. The selectivity is affected by factors such as catalyst ...

AI Technical Summary

Problems solved by technology

Carriers with different characteristics have different mass and heat transfer properties, and can form different interaction forces with Co metal, which makes the thermal stability of the supported cobalt catalysts vary greatly.

Using SiC carrier with high thermal conductivity to support cobalt catalyst is beneficial to avoid the generation of hot spots in the reaction process and improve the performance of the catalyst, but SiC carrier is expensive and has low specific surface area, which limits its practical application.

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