A kind of Fischer-Tropsch synthesis catalyst and preparation method thereof

Abstract

The invention provides a Fischer-Tropsch synthesis catalyst, which includes a carrier and an active component. The carrier is a nitrogen-doped hollow carbon nanocage. The active component is distributed on the surface of the carrier. The active component is a metal oxide. Nanoparticles, the metal oxide is iron oxide or cobalt oxide, the loading amount of the metal oxide is 5 to 51 wt.% based on the percentage of metal elements in the carrier, and the nitrogen-doped hollow carbon nanocage has Nitrogen content is 5~20at.%. The present invention uses nitrogen-doped hollow carbon nanocages with high nitrogen content as carriers. The nitrogen atoms in the carrier have an anchoring effect on metal oxides, which can improve the interaction between the carrier and active components, and the nitrogen atoms are alkaline. The surface alkalinity of the carrier is improved, and at the same time combined with the unique structure and active components of the carrier, a Fischer-Tropsch synthesis catalyst with high selectivity, good anti-sintering performance and high stability is obtained.

Description

Technical field [0001] The invention relates to the technical field of Fischer-Tropsch synthesis, in particular to a Fischer-Tropsch synthesis catalyst and a preparation method thereof. Background technique [0002] Fischer Tropsch Synthesis refers to the synthesis of synthesis gas (H 2 And CO) are converted to hydrocarbons in a heterogeneous catalytic reaction process, which can be used to produce light olefins (C ＝ 2 -C 4 ＝ ), gasoline, diesel, paraffin and other oxygenated organic products. Syngas has a wide range of raw materials, which can be obtained from coal, natural gas, shale gas and biomass raw materials. The indirect conversion of coal, natural gas, shale gas and biomass raw materials into fuels and chemical products through Fischer-Tropsch synthesis has strong development prospects, especially for the optimized utilization of fossil energy such as coal, natural gas, and shale gas. The adjustment of the energy structure has important strategic significance. [0003] C...

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Problems solved by technology

[0004] At present, the commonly used Fischer-Tropsch synthesis catalysts are mainly based on oxides (such as Al 2 o 3 , SiO 2 etc.) as the carrier iron-based catalyst, but due to the strong force between the carrier and the active component, the active component is difficult to reduce and is not easy to form catalytically active iron carbide, or the iron carbide is easily oxidized to inactive in the reaction process. Silicate and aluminate, etc. lead to unstable catalyst performance and easy deactivation

Recent studies have shown that new carbon materials (such as carbon nanotubes (CNTs), carbon nanofibers (CNFs), ordered mesoporous carbons, and graphenes) with high specific surface area, excellent chemical stability, and tunable pore structure etc.) Catalysts loaded with Fe exhibit higher C 2 ＝ -C 4 ＝ However, the stability of this type of catalyst is still poor. Due to the weak interaction between the carbon material support and the iron active component, this type of catalyst is easy to sinter, which leads to serious deactivation of the catalyst in a short time.

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