Dual mesoporous cobalt-based catalyst as well as preparation method and application thereof

A cobalt-based catalyst, double mesoporous technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as poor connectivity and achieve the effect of avoiding diffusion limitations

Active Publication Date: 2011-05-18
中科潞安能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pores obtained by this method are not formed by self-assembly, and the connectivity between the channels is poor, which still has a certain restrictive effect on the transmission of materials.

Method used

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  • Dual mesoporous cobalt-based catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] At 25°C, dissolve 19.6g CTAB in 350ml deionized water, stir for 30min, add 3.22ml TMB, and then add 23.96g Na 2 SiO 3 9H 2 O, continue to stir until the solution is clear, quickly add 35ml of ethyl acetate under stirring, ultrasonic for 60s, stop stirring, let stand for 8h, then age at 60°C for 36h. Finally, after baking at 60° C. for 24 hours, the temperature was raised to 500° C. for 6 hours at 1° C. / min to obtain a double mesoporous carrier.

[0022] 3 g of the support was dissolved in 7.4 ml of a solution containing 2.557 g of cobalt nitrate for equal volume impregnation. Put the undried catalyst sample into the inner layer of a double-layer autoclave connected to the top after impregnating with equal volume for 20 hours, then put 10wt% ammonia solution in the outer layer of the autoclave, seal it and place it in an oven at 60°C for reaction 0.5h, naturally cooled to room temperature, then baked in an oven at 80°C for 12h, and finally baked in a muffle furnace at...

Embodiment 2

[0026] At 30°C, 19.6g CTAB was dissolved in 350ml deionized water, after stirring for 30min, 12.91ml TMB was added, and then 23.96g Na 2 SiO 3 9H 2 O, continue to stir until the solution is clear, quickly add 35ml of ethyl acetate under stirring, ultrasonic for 30s, stop stirring, let stand for 3h, then age at 60°C for 72h. Finally, after baking at 60° C. for 30 h, it was baked at 650° C. for 10 h at 1° C. / min to obtain a double mesoporous carrier.

[0027] 3 g of the support was dissolved in 11 ml of a solution containing 4.719 g of cobalt nitrate for equal volume impregnation. Put the undried catalyst sample into the inner layer of a double-layer autoclave connected to the top after impregnating with equal volume for 20 hours, then put 15wt% ammonia solution in the outer layer of the autoclave, seal it and place it in an oven at 60°C for reaction 1h, naturally cooled to room temperature, then baked in an oven at 60°C for 48h, and finally baked in a muffle furnace at 500°C...

Embodiment 3

[0031] At 40°C, 19.6g CTAB was dissolved in 350ml deionized water, after stirring for 40min, 18.21ml TMB was added, and then 23.96g Na 2 SiO 3 9H 2 O, continue to stir until the solution is clear, add 35ml of ethyl acetate quickly under stirring, ultrasonic for 40s, stop stirring, let stand for 8h, and then age at 90°C for 48h. Finally, after baking at 60° C. for 30 h, it was baked at 500° C. for 8 h at 1° C. / min to obtain a double mesoporous carrier.

[0032] 3 g of the support was dissolved in 6.8 ml of a solution containing 1.754 g of cobalt nitrate for equal volume impregnation. Put the undried catalyst sample into the inner layer of a double-layer autoclave connected to the top after impregnating equal volume for 25 hours, then put 20wt% ammonia solution in the outer layer of the autoclave, seal it and place it in an oven at 80°C for reaction 1h, naturally cooled to room temperature, then baked in an oven at 60°C for 24h, and finally baked in a muffle furnace at 500°C ...

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Abstract

The invention disclosed a dual mesoporous cobalt-based catalyst comprising 5-44 percent of metallic cobalt and 56-95 percent of dual mesoporous silicon dioxide, wherein the first pore diameter of the dual mesoporous catalyst is 2.3-2.6nm which accounts for 20-35 percent of the catalyst pore structure; and the second pore diameter of the dual mesoporous catalyst is 10-50nm which accounts for 40-60 percent of the catalyst pore structure. The catalyst can be prepared by adopting a volumetric immersion method. The dual mesoporous cobalt-based catalyst has abundant mesoporous structures; and the catalyst has different double pore canal structures, thus the diffusional limitation and other problems of reactants and products can be avoided. The ratio of pore diameters of 2.3-2.6nm of small pore to 10-50nm of large pore in a carrier can be adjusted by changing the ratio of a pore-expanding agent TMB (Tetramethylbenzidine) and a surfactant CTAB (Cetyltrimethyl Ammonium Bromide) and the ageing temperature, thus the dual mesoporous cobalt-based catalyst has the advantage of facilitating the selective synthesis of long chain hydrocarbons with different carbon numbers.

Description

technical field [0001] The invention relates to a catalyst, its preparation method and application, in particular to a preparation method of a cobalt catalyst supported by a double mesoporous material and its application in Fischer-Tropsch synthesis. technical background [0002] Fischer-Tropsch synthesis refers to the process of synthesizing hydrocarbons from syngas in the presence of catalysts. Cobalt-based catalysts have high activity, C 5 +The advantage of high selectivity is a catalyst commonly used in Fischer-Tropsch synthesis. Although Fischer-Tropsch synthesis has been studied for more than ten years, due to the shortage of fuel and environmental pollution in recent years, Fischer-Tropsch synthesis as a gas-to-oil technology has received attention again. Compared with the extraction of gasoline and diesel from crude oil, the Fischer-Tropsch synthesis process is considered to be a friendly process for the preparation of middle distillates and lubricants from syngas,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J21/08B01J35/10B01J37/02C07C9/14C07C1/06
Inventor 孙予罕任润厚李德宝郭金刚刘斌孙志强薛江卫贾丽涛
Owner 中科潞安能源技术有限公司
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