Catalyst for co-producing low-carbon olefins from synthesis gas to gasoline and preparation method thereof

Abstract

The invention discloses a catalyst for the co-production of low-carbon olefins from syngas to gasoline and a preparation method thereof, wherein the preparation method of the catalyst comprises the following steps: (1) combining EDTA, EDTA2Na and Fe(NO 3 ) 3 9H 2 O is added to water to make a uniform Fe-EDTA-EDTA2Na complex solution without precipitation. In this complex solution, the content of Fe is that of the carrier γ-Al 2 o 3 10wt% by weight, the molar ratio of Fe, EDTA and EDTA2Na is 2:1:1; (2) the carrier γ-Al 2 o 3 Add it to the Fe‑EDTA‑EDTA2Na complex solution, mix well and dry overnight to obtain a solid; (3) Grind the solid into powder; (4) Roast the powder at 500‑600°C for 4h‑6h to obtain Fe‑ Na / γ‑Al 2 o 3 powder. The present invention is beneficial in that: the catalyst prepared by the method can not only improve the C 5 -C 11 hydrocarbon selectivity, and can enhance the C 2 -C 4 The alkenes ratio of hydrocarbons can also suppress the undesired product CH 4 It is suitable for the F-T synthesis of synthesis gas, and is one of the best catalysts for the co-production of low-carbon olefins from synthesis gas to gasoline.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for producing gasoline from synthesis gas for co-production of low-carbon olefins and a preparation method thereof, and belongs to the technical field of catalysts. Background technique [0002] my country's energy reserves are characterized by rich coal, poor oil, and little gas. This coal-based energy structure has led to increasingly prominent environmental problems. [0003] Synthesis gas (CO and H 2 mixed gas), which can not only produce clean fuels and high value-added chemicals through Fischer-Tropsch synthesis (Fischer-Tropsch process, referred to as F-T synthesis), but also effectively alleviate environmental problems in the process of coal resource utilization, so it has been Widespread concern. [0004] The use of synthesis gas to produce gasoline fraction hydrocarbons through F-T synthesis has important strategic significance for my country's...

AI Technical Summary

Problems solved by technology

Although many catalysts used in F-T synthesis have been developed, there are still many problems in these catalysts in F-T synthesis. The main problem is: the traditional F-T synthesis is limited by the Anderson-Schulz-Flory (ASF) distribution model Restrictions, low-carbon olefins and gasoline with high added value (C 5 -C 11 ) is less selective

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