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A kind of core-shell type Fischer-Tropsch synthesis catalyst and its synthesis method and application

A technology of Fischer-Tropsch synthesis and synthesis method, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of difficult to obtain low-carbon olefins with high selectivity, and achieve the goal of suppressing long-chain hydrocarbons Effects that generate, enhance selectivity, and operate easily

Active Publication Date: 2019-11-01
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, traditional Fischer-Tropsch synthesis industrial catalysts are difficult to obtain low-carbon olefins with high selectivity

Method used

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  • A kind of core-shell type Fischer-Tropsch synthesis catalyst and its synthesis method and application
  • A kind of core-shell type Fischer-Tropsch synthesis catalyst and its synthesis method and application
  • A kind of core-shell type Fischer-Tropsch synthesis catalyst and its synthesis method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Silicone modification:

[0044] Disperse 0.1g tetramethoxysilane with 0.5mL ethanol to obtain a tetramethoxysilane dispersion, add 0.4g iron-based Fischer-Tropsch synthesis catalyst and tetramethoxysilane dispersion to a round bottom flask, mix well, and Place the round bottom flask in a rotary evaporator and rotate at a constant speed, and keep it at 40°C for 0.5h, then raise the temperature by 5°C every 0.5h, keep it at 70°C for 1h, then put the round bottom flask in an oven at 200°C for 10h , to obtain a modified iron-based Fischer-Tropsch synthesis catalyst.

[0045] 2. Preparation of SAPO-34 molecular sieve crystallization liquid:

[0046] Dissolve 2.0g of solid phosphoric acid in 7.8mL of distilled water, then add 1.3g of pseudo-boehmite (Al2 o 3 content of 80wt%), stirred for 2h, then added 2.9g25wt% tetraethylammonium hydroxide aqueous solution, 1.7g morpholine and 1.2g30wt% silica sol, and continued to stir for 5h to obtain SAPO-34 molecular sieve crystall...

Embodiment 2

[0058] 1. Silicone modification:

[0059] Disperse 0.1g tetramethoxysilane with 0.5mL ethanol to obtain a tetramethoxysilane dispersion, add 0.4g iron-based Fischer-Tropsch synthesis catalyst and tetramethoxysilane dispersion into a round bottom flask, mix well, and Place the bottom flask in a rotary evaporator and rotate at a constant speed, and keep it at 40°C for 0.5h, then raise the temperature by 5°C every 0.5h, keep it at 70°C for 1h, then put the round bottom flask in an oven at 200°C for 10h, A modified iron-based Fischer-Tropsch synthesis catalyst is obtained.

[0060] 2. Preparation of multi-stage porous SAPO-34 molecular sieve crystallization solution:

[0061] Dissolve 2.0g of solid phosphoric acid in 7.8mL of distilled water, then add 1.3g of pseudo-boehmite (Al 2 o 3 content is 80wt%), stirred for 2h, then added 2.9g25wt% tetraethylammonium hydroxide aqueous solution, 1.7g morpholine and 1.2g30wt% silica sol, continued to stir for 5h, then added 0.04g sodium f...

Embodiment 3

[0071] 1. Silicone modification:

[0072] Disperse 0.1g tetramethoxysilane with 0.5mL ethanol to obtain a tetramethoxysilane dispersion, add 0.4g iron-based Fischer-Tropsch synthesis catalyst and tetramethoxysilane dispersion to a round bottom flask, mix well, and Place the round bottom flask in a rotary evaporator and rotate at a constant speed, and keep it at 40°C for 0.5h, then raise the temperature by 5°C every 0.5h, keep it at 70°C for 1h, then put the round bottom flask in an oven at 200°C for 10h , to obtain a modified iron-based Fischer-Tropsch synthesis catalyst.

[0073] 2. AIPO 4 Preparation of -5 molecular sieve crystallization liquid:

[0074] Dissolve 2.0g of solid phosphoric acid in 7.8mL of distilled water, then add 1.3g of pseudo-boehmite (Al 2 o 3 The content is 80wt%), stirred for 2h, then added 2.9g25wt% tetraethylammonium hydroxide aqueous solution, 1.7g morpholine, and continued to stir for 5h to obtain AIPO 4 -5 molecular sieve crystallization liqui...

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Abstract

The invention discloses a new core-shell type Fischer-Tropsch synthesis catalyst and its synthesis method and application. The catalyst is a molecular sieve wrapped in a silicone-modified iron-based Fischer-Tropsch synthesis catalyst. Its structural feature is that it forms a core-shell type structure. New Catalyst Fe 3 C‑SiO 2 @SAPO‑34. The specific synthesis methods are: 1) silicone-modified iron-based Fischer-Tropsch synthesis catalyst; 2) preparation of molecular sieve crystallization liquid; 3) preparation of new core-shell Fischer-Tropsch synthesis catalyst. The catalyst is used in the Fischer-Tropsch synthesis reaction. The synthesis gas molecules can pass through the molecular sieve shell and enter the core catalyst and interact with the Fe-based active sites on its surface. After the Fischer-Tropsch synthesis reaction, a series of hydrocarbon products are generated. In the limits of the shell molecular sieve channels, Under the action of the domain, the diffusion of long-chain hydrocarbons in the Fischer-Tropsch synthesis product is restricted, significantly inhibiting the generation of long-chain hydrocarbons in the final product, thereby effectively improving the selectivity of low-carbon olefins.

Description

technical field [0001] The invention belongs to the technical field of Fischer-Tropsch synthesis catalysts, and in particular relates to a core-shell Fischer-Tropsch synthesis catalyst and its synthesis method and application. Background technique [0002] Fischer-Tropsch synthesis (FTS for short) is the synthesis gas (H 2 / CO) into hydrocarbons (mainly long-chain alkanes and alkenes) and oxygenates (alcohols, aldehydes, ketones, acids, etc.) were first discovered in 1923 by German scientists Franz Fischer and Hans Tropsch. Low-carbon olefins represented by ethylene and propylene are important basic raw materials for the modern petrochemical industry. However, the economics and competitiveness of traditional petroleum routes to produce low-carbon olefins and other chemical products have always been challenged. The direct production of low-carbon olefins from syngas is one of the best ways and development directions for high-value conversion and utilization of non-petroleum ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85C10G2/00
CPCC10G2/334B01J29/85B01J35/51
Inventor 王立邱桃张煜华李金林
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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