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A high-throughput preparation method for prolonging the service life of multi-acid-based Fischer-Tropsch composite catalysts

A technology of composite catalyst and service life, which is applied in the direction of catalyst activation/preparation, preparation of liquid hydrocarbon mixture, catalyst protection, etc. It can solve the problems of low added value and achieve the effect of moderate pore size, simple preparation method and easy recycling

Active Publication Date: 2019-04-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acidic sites of zeolite can effectively crack heavy hydrocarbon products produced by Fischer-Tropsch synthesis, but its strong acidity can also cause excessive cracking to form low value-added products such as methane and ethane

Method used

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  • A high-throughput preparation method for prolonging the service life of multi-acid-based Fischer-Tropsch composite catalysts
  • A high-throughput preparation method for prolonging the service life of multi-acid-based Fischer-Tropsch composite catalysts

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preparation example Construction

[0027] The high-throughput preparation method of the present invention for extending the service life of the multi-acid-based Fischer-Tropsch composite catalyst includes the following steps:

[0028] In step 1, the polyacid with a mass fraction of 1-90% and a Fischer-Tropsch synthesis catalyst with a mass fraction of 10-99% are hydrothermally combined to form a polyacid-based Fischer-Tropsch synthesis catalyst. The polyacid catalyst is any one or a combination of any of Keggin type polyacid salt, Dawson type polyacid salt and Lindqvist type polyacid salt. The general formula of the Keggin type polyacid salt is: A m H n [XM 12 O 40 ] (A = Li, Na, K, Cs, Mg, Ga, Al, Ce; X = Si, Ge, P, As, B; M = W, Mo; The general formula of Dawson type polyacid salt is : A m H n [X 2 M 18 O 62 ] (A = Li, Na, K, Cs; X = P, As; M = W, Mo; m = 0-6; n = 0-6); The general formula of the Lindqvist type polyacid salt is: A m H n [X x M y O 19 ] (A = Li, Na, K, Cs; X&M = V, Nb, W, Mo, Ta; x + y = 6; m = 0...

Embodiment 1

[0042] In this embodiment, see figure 2 As shown in Table 1, a high-throughput preparation method for prolonging the service life of a polyacid-based Fischer-Tropsch synthesis catalyst includes the following steps:

[0043] Add 5 grams of polyacid catalyst H 3 PW 12 O 40 Pour into a beaker containing 10 grams of deionized water and stir magnetically for 30 minutes until completely dissolved. Put 5 grams of Fischer-Tropsch synthesis catalyst 10Co / Al 2 O 3 Put it into a beaker and stir mechanically until the solution containing the polyacid is impregnated into the pores of the Fischer-Tropsch synthesis catalyst carrier. Keep immersing for 6 hours, stirring every half an hour during this period to ensure full immersion. Then the catalyst in the beaker was transferred to a 25ml polytetrafluoroethylene lined autoclave, heated at 150°C for 72 hours, cooled naturally, cooled and dried, and calcined at 200°C for 4 hours to obtain a polyacid-based Fischer-Tropsch composite catalyst. Th...

Embodiment 2

[0046] Add 4 grams of polyacid catalyst H 4 SiW 12 O 40 Pour into a beaker containing 10 grams of deionized water, heat and stir for 5 minutes until completely dissolved. Add 6 grams of Fischer-Tropsch synthesis catalyst 5Ru / Al 2 O 3 Put it in a beaker and stir until the solution containing polyacid is immersed in the pores of the Fischer-Tropsch synthesis catalyst carrier. Keep immersing for 10 hours, stirring every hour during this period to ensure full immersion. Then the catalyst in the beaker was transferred to a 25ml polytetrafluoroethylene liner autoclave, heated at 180°C for 96 hours, cooled naturally, cooled and dried, and calcined at 300°C for 2 hours to obtain a composite catalyst. A solution of TEOS and 1M dilute hydrochloric acid was prepared at a molar ratio of 1:3, and the solution was put into a high flux hydrothermal reactor at a ratio of 1:2 with a polyacid-based Fischer-Tropsch synthesis catalyst, and heated to 150 under autogenous pressure. o C, keep for 24 ...

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Abstract

The invention discloses a high-throughput production method for prolonging the service life of a poly-acidic-group type Fischer-tropsch composite catalyst. The method comprises the following steps of forming a poly-acidic-group type Fischer-tropsch composite catalyst through the hydrothermal composite reaction of 1-90% wt% of polyacid and 10-99% wt% of a Fischer-tropsch composite catalyst; preparing a first solution by adopting tetraethoxysilane and diluted hydrochloric acid in the proportion of 1:1 to 1:20; adding the poly-acidic-group type Fischer-tropsch composite catalyst and the first solution in a high-throughput hydrothermal reaction still in the proportion of 1:1 to 1:10 to obtain a poly-acidic-group type Fischer-tropsch composite catalyst sample with a silicone protective layer; adding the poly-acidic-group type Fischer-tropsch composite catalyst sample in a muffle furnace; and adding the obtained poly-acidic-group type Fischer-tropsch composite catalyst into the reaction device of a Fischer-tropsch fixed bed to estimate the reaction performance. In this way, the service life of the poly-acidic-group type Fischer-tropsch composite catalyst is prolonged from 150 hours to over 1000 hours.

Description

Technical field [0001] The invention relates to the technical field of catalyst synthesis, in particular to a high-throughput preparation method for prolonging the service life of a polyacid-based Fischer-Tropsch composite catalyst. Background technique [0002] Polyoxometalates have a wide range of constituent elements, diverse structural changes, super acidity and good thermal stability, and are a new and efficient solid acid catalyst. In some countries, polyacid catalysts have been industrially applied in the catalytic processes of esterification, alkylation, and olefin hydration. Fischer-Tropsch (FTS) is the process of passing non-oil resources such as natural gas, coal, and biomass through synthesis gas (H 2 And CO) is an important industrial catalytic process for converting high-quality clean liquid fuels and high value-added chemicals. The main products of traditional Fischer-Tropsch synthesis are straight-chain alkanes, which are in line with the Anderson-Schulz-Flory (A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/16B01J27/188B01J37/10B01J33/00C10G2/00
CPCB01J23/30B01J27/188B01J33/00B01J37/10C10G2/33C10G2300/70
Inventor 李谦王春玲刘成殷禛昊周国治
Owner SHANGHAI UNIV
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