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Preparation and application of carbon modified silicon dioxide carrier loaded iron-based catalyst for Fischer-Tropsch synthesis

An iron-based catalyst, silica technology, applied in the direction of catalyst activation/preparation, hydrocarbon production from carbon oxides, carbon compound catalysts, etc., can solve the problems of low Fischer-Tropsch activity, difficulty in improving activity and olefin selectivity, and achieve The effect of low cost, low requirements for raw material composition, and wide application range

Active Publication Date: 2016-10-12
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low Fischer-Tropsch activity and difficulty in improving the activity and olefin selectivity of existing silica-supported iron-based catalysts, a preparation of a carbon-modified silica-supported iron-based catalyst with a secondary pore structure is provided and its application in Fischer-Tropsch reaction

Method used

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  • Preparation and application of carbon modified silicon dioxide carrier loaded iron-based catalyst for Fischer-Tropsch synthesis
  • Preparation and application of carbon modified silicon dioxide carrier loaded iron-based catalyst for Fischer-Tropsch synthesis
  • Preparation and application of carbon modified silicon dioxide carrier loaded iron-based catalyst for Fischer-Tropsch synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of carbon-modified silica support 5C-S10. Make 1.189g sucrose into an aqueous solution, impregnate an equal volume in 10g SiO 2(S-10) on the carrier, impregnated at room temperature for 10h, then dried by rotary evaporation, and finally in a nitrogen atmosphere at 450°C for 4000h -1 Calcined at the bottom for 4 hours to obtain carbon-modified silica carrier 5C-S10.

[0028] 2) Preparation of 15Fe / 5C-S10 catalyst. 10.821g Fe(NO 3 ) 3 9H 2 O was made into an aqueous solution, and an equal volume was impregnated on 8.5 g of the carrier obtained in step 1). After impregnated at room temperature for 2 hours, it was rotated to dryness at 80°C under negative pressure and dried at 120°C for 12 hours. Finally, in nitrogen atmosphere, 300°C, 5000h -1 Calcined for 5 hours, the catalyst 15Fe / 5C-S10 was prepared.

[0029] 3) Activity test. The activity of the prepared catalysts was evaluated in a fixed bed reactor. The catalyst is first reduced in situ, and ...

Embodiment 2

[0031] 1) Preparation of carbon-modified silica support 10C-S10. Make 2.378g sucrose into an aqueous solution, impregnate an equal volume in 10g SiO 2 (S-10) on the carrier, impregnated at room temperature for 10h, then dried by rotary evaporation, and finally in a nitrogen atmosphere at 450°C for 4000h -1 Calcined at the bottom for 4 hours to obtain carbon-modified silica carrier 10C-S10.

[0032] 2) Preparation of 15Fe / 10C-S10 catalyst. 10.821g Fe(NO 3 ) 3 9H 2 O was made into an aqueous solution, and an equal volume was impregnated on 8.5 g of the carrier obtained in step 1). After impregnated at room temperature for 2 hours, it was rotated to dryness at 80°C under negative pressure and dried at 120°C for 12 hours. Finally, in nitrogen atmosphere, 300°C, 5000h -1 Under roasting for 5h, the catalyst 15Fe / 10C-S10 was prepared.

[0033] 3) The activity test is the same as in Example 1, and the results are shown in Table 1.

Embodiment 3

[0035] 1) Preparation of carbon-modified silica support 15C-S10. Make 3.567g sucrose into an aqueous solution, impregnate equal volume in 10g SiO 2 (S-10) on the carrier, impregnated at room temperature for 10h, then dried by rotary evaporation, and finally in a nitrogen atmosphere at 450°C for 4000h -1 Calcined at the bottom for 4h to obtain carbon-modified silica carrier 15C-S10.

[0036] 2) Preparation of 15Fe / 15C-S10 catalyst. 10.821g Fe(NO 3 ) 3 9H 2 O was made into an aqueous solution, and an equal volume was impregnated on 8.5 g of the carrier obtained in step 1). After impregnated at room temperature for 2 hours, it was rotated to dryness at 80°C under negative pressure and dried at 120°C for 12 hours. Finally, in nitrogen atmosphere, 300°C, 5000h -1 Calcined for 5 hours, the catalyst 15Fe / 15C-S10 was prepared.

[0037] 3) The activity test is the same as in Example 1, and the results are shown in Table 1.

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Abstract

The invention discloses a preparation and an application of a carbon modified silicon dioxide carrier loaded iron-based catalyst for Fischer-Tropsch synthesis. The carbon modified silicon dioxide with second-level hole structure is taken as a carrier of the carrier provided by the invention and iron is taken as a main catalyst and auxiliaries are added; the second-level hole structure is composed of a primary silicon dioxide macro-porous structure and a carbon film layer modified small-porous structure; the second-level hole structure is beneficial to the promotion of the dispersion of active component iron, can prevent iron and silicon dioxide carrier from forming unreducible ferrosilite, can boost the carbonization and activation of iron and can effectively restrain the secondary hydrogenation of Fischer-Tropsch primary product so as to acquire high Fischer-Tropsch reaction activity and selectivity of olefin products. Besides, the catalyst provided by the invention has excellent mechanical strength and hydrothermal stability and is fit for the Fischer-Tropsch synthesis of slurry reactor and fluidized bed; the raw materials for preparing the catalyst are low in cost; the preparation method is simple; the repeatability is excellent; the catalyst is fit for industrial production application.

Description

technical field [0001] The invention belongs to the technical field of synthesis gas conversion, and relates to the preparation of a carbon-modified silicon dioxide supported iron-based catalyst and its application in Fischer-Tropsch reaction. Background technique [0002] Olefins, especially low-carbon olefins (ethylene, propylene, butene) are important chemical raw materials, and currently mainly come from naphtha cracking. Based on the characteristics of my country's resource composition, which is rich in coal, less in gas, and less in oil, the synthesis of olefins by non-petroleum routes has attracted more and more attention. The direct preparation of olefins from coal-based syngas has the advantages of short process, low energy consumption and coal consumption, and is one of the current research hotspots. [0003] Among the catalysts currently used for Fischer-Tropsch synthesis of olefins from syngas, iron-based and cobalt-based catalysts have been more fully studied. ...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J23/78B01J23/889B01J27/24B01J35/04B01J37/08C10G2/00C07C1/04C07C11/02
CPCC10G2/332C07C1/044C07C1/0445B01J23/745B01J23/78B01J23/8892B01J27/24B01J37/084C07C2523/78C07C2523/745C07C2523/889C07C2527/24C10G2300/70B01J35/56C07C11/02
Inventor 刘小浩姜枫胥月兵
Owner JIANGNAN UNIV
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