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Preparation method of Ni@SiO2 core-shell structure catalyst and application of Ni@SiO2 core-shell catalyst in methane and carbon dioxide reforming reaction

A technology of structural catalyst and core-shell structure, applied in the fields of energy utilization and environment, can solve problems such as catalyst deactivation, and achieve the effects of good activity, simple and easy operation, and reduced catalyst cost.

Inactive Publication Date: 2019-01-18
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the previous research on precious metal catalysts such as Ru, Pt, Pd, Ir, etc., the source is more extensive, the price is lower, and it is more suitable for mass production required by industry. However, carbon deposits are inevitably formed during the reaction process, and in severe cases, carbon deposits are blocked. Catalyst pores, covering surface metal active sites, leading to catalyst deactivation

Method used

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  • Preparation method of Ni@SiO2 core-shell structure catalyst and application of Ni@SiO2 core-shell catalyst in methane and carbon dioxide reforming reaction
  • Preparation method of Ni@SiO2 core-shell structure catalyst and application of Ni@SiO2 core-shell catalyst in methane and carbon dioxide reforming reaction
  • Preparation method of Ni@SiO2 core-shell structure catalyst and application of Ni@SiO2 core-shell catalyst in methane and carbon dioxide reforming reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Mix 0.005 mol of polyoxyethylene (n=20) cetyl ether with 15 ml of cyclohexane, and stir evenly in a water bath at 40° C. to form a white emulsion.

[0027] b. Add dropwise 0.5 milliliters of nickel nitrate solution with a concentration of 1 mole per liter into the white emulsion, stir evenly, and the emulsion is light green.

[0028] c. Raise the temperature of the water bath to 50 degrees, and slowly add 0.6 ml of hydrazine hydrate with a concentration of 80 percent to the solution. Seal and stir for 20 minutes. Forms a light purple emulsion.

[0029] b. Keeping the temperature constant, 2.1 ml of tetraethyl orthosilicate was slowly added dropwise to the solution, and the mixture was sealed and stirred for 40 minutes.

[0030] d. Dissolve 0.001 mole of L-lysine in 139 ml of water, take 26.2 ml of L-lysine solution and put it in a 60-degree water bath, and slowly add the solution obtained in step b to the entire solution drop by drop. Control the dropping time to ...

Embodiment 2

[0035] a. Mix 0.005 mol of polyoxyethylene (n=20) cetyl ether with 15 ml of cyclohexane, and stir evenly in a 40-degree water bath to form a white emulsion.

[0036] b. Add dropwise 0.5 mL of nickel nitrate solution with a concentration of 1 mole per liter into the white emulsion, stir evenly, and the emulsion becomes light green.

[0037] c. Raise the temperature of the water bath to 50 degrees, and slowly add 0.6 ml of hydrazine hydrate with a concentration of 80 percent to the solution. Seal and stir for 20 minutes. Forms a light purple emulsion.

[0038] d. Keeping the temperature constant, 2.1 ml of tetraethyl orthosilicate was slowly added dropwise to the solution, and the mixture was sealed and stirred for 40 minutes.

[0039] e. Dissolve 0.001 mole of L-lysine in 139 ml of water, take 26.2 ml of L-lysine solution and put it in a 60-degree water bath, and slowly add the solution obtained in step b to the entire solution drop by drop. Control the dropping time for 30 ...

Embodiment 3

[0044] a. Mix 0.005 mol of polyoxyethylene (n=20) cetyl ether with 15 ml of cyclohexane, and stir evenly in a 40-degree water bath to form a white emulsion.

[0045]b. Add dropwise 0.5 milliliters of nickel nitrate solution with a concentration of 1 mole per liter into the white emulsion, stir evenly, and the emulsion is light green.

[0046] c. Raise the temperature of the water bath to 50 degrees, and slowly add 0.6 ml of hydrazine hydrate with a concentration of 80 percent to the solution. Seal and stir for 20 minutes. Forms a light purple emulsion.

[0047] d. Keeping the temperature constant, slowly add 2.1 ml of tetraethyl orthosilicate dropwise to the solution, and stir for 40 minutes under seal.

[0048] e. Dissolve 0.001 mole of L-lysine in 139 ml of water, take 26.2 ml of L-lysine solution and put it in a 60-degree water bath, and slowly add the solution obtained in step b to the entire solution drop by drop. Control the dropping time for 30 minutes, stir evenly, ...

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Abstract

The invention belongs to fields of energy utilization and environmental technology, and particularly provides a preparation method of Ni@SiO2 core-shell structure catalysts and application of Ni@SiO2core-shell structure catalysts in a methane and carbon dioxide reforming reaction. The catalyst is a core-shell structure catalyst with nickel nano-particles as cores and silicon dioxide spheres as shells. The mass percentage of nickel is 3-6 wt%, the size of nickel particles is 1-4 nm, the mass percentage of silica is 97-94 wt%, and the diameter dimension of silicon dioxide spheres is 25-35 nm. The catalyst has better performance in the dry reforming reaction of methane and carbon dioxide. The methane conversion rate can reach 88% at 750 DEG C, the carbon dioxide conversion rate can reach 93%, and the catalytic activity can be kept stable for 2,500 minutes or more. With non-precious metal nickel as an active center, the catalyst greatly reduces catalyst cost, and is easy to operate, and has a good development prospect in industrial production.

Description

technical field [0001] The invention belongs to the technical field of energy utilization and environment, and relates to a preparation method of a Ni@SiO2 core-shell structure catalyst and its application in methane carbon dioxide reforming reaction. technical background [0002] Methane is the main component of natural gas and shale gas. Compared with fossil energy such as coal and oil, methane has a wider range of sources, larger global reserves, and cleaner and more environmentally friendly combustion. As natural gas resources such as seabed combustible ice have been discovered in large quantities, this kind of resource has attracted people's attention and attention. Vigorously developing and utilizing this kind of resource has become the best choice for countries all over the world to improve the environment and maintain sustainable development. However, the thermodynamic stability of methane makes its activation and conversion still difficult. The conversion and utiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J35/08C01B3/40
CPCC01B3/40B01J23/755C01B2203/0238B01J35/398B01J35/393B01J35/23B01J35/51Y02P20/52
Inventor 王发根张林佳韩柏林
Owner JIANGSU UNIV
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