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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 novel core-shell type Fischer-Tropsch synthesis catalyst and a synthesis method and application thereof. The catalyst is formed by coating organosilicone-modified iron-based Fischer-Tropsch synthesis catalyst with a molecular sieve, and is structurally characterized by forming the novel synthesis catalyst with a core-shell structure, Fe3C-SiO2 @ SAPO-34. The synthesis method comprises the steps of (1) modifying a iron-based Fischer-Tropsch synthesis catalyst by organosilicone; (2) preparing molecular sieve crystallization liquid; (3) preparing the novel core-shell type Fischer-Tropsch synthesis catalyst. By applying the catalyst into a Fischer-Tropsch reaction, synthesis gas molecules can penetrate through a molecular sieve shell layer to enter a core catalyst and interact with Fe-base active sites on surface of the core catalyst to generate a series of hydrocarbon products by means of the Fischer-Tropsch reaction, the diffusion of long chain hydrocarbons in Fischer-Tropsch synthetic products is limited under the domain limitation action of a shell layer molecular sieve porous channel, so as to obviously inhibit the generation of final products, the long chain hydrocarbons, 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
CPCB01J29/85B01J35/08C10G2/334
Inventor 王立邱桃张煜华李金林
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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