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Preparation method of NiO@SiO2@CoAl-LDH multistage core-shell catalyst

A core-shell catalyst and the obtained technology, which are applied in the fields of energy utilization and environment, can solve the problems of uncontrollable Ni particle size, insufficient reaction life, etc. high yield effect

Active Publication Date: 2021-03-09
上海簇睿低碳能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its reactivity is high, but its reaction life is not long enough, the Ni particle size is uncontrollable, and the synergistic effect of NiCo alloy requires a certain distance to maximize its effect

Method used

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  • Preparation method of NiO@SiO2@CoAl-LDH multistage core-shell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, dissolve 1.25g of nickel acetate tetrahydrate and 10g of polyvinylpyrrolidone in a propanol solution, and the volume ratio of alcohol to water is 1:1. After stirring until dissolved, transfer it to a polytetrafluoroethylene-lined hydrothermal kettle for hydrothermal reaction. The volume of the propanol solution is 1500mL, the hydrothermal reaction temperature is 120°C, and the hydrothermal reaction time is 16h. NiO nanoparticles were obtained after filtration and washing.

[0032] After ultrasonication of NiO nanoparticles for 60 min, they were uniformly dispersed in the solution, and ethanol, deionized water, ammonia water, and cetyltrimethylammonium bromide (CTAB) were sequentially added to it; ethanol, deionized water, and ammonia water were mixed The volumes of the solutions were 250mL, 250mL, and 10mL, respectively; the amount of cetyltrimethylammonium bromide added was 7.29g; stirring was continued at room temperature for 3h, so that the NiO nanoparticles w...

Embodiment 2

[0037] First, dissolve 1.25g of nickel acetate tetrahydrate and 5g of polyvinylpyrrolidone in methanol solution, and the volume ratio of alcohol to water is 1:0.3. After stirring until dissolved, transfer it to a polytetrafluoroethylene-lined hydrothermal kettle for hydrothermal reaction. The volume of the methanol solution is 2000mL, the hydrothermal reaction temperature is 100°C, and the hydrothermal reaction time is 8h. NiO nanoparticles were obtained after filtration and washing.

[0038] After ultrasonication of NiO nanoparticles for 60 min, they were uniformly dispersed in the solution, and ethanol, deionized water, ammonia water, and cetyltrimethylammonium bromide (CTAB) were added in sequence; ethanol, deionized water, and ammonia water were mixed The volumes of the solutions were 750mL, 750mL, and 15mL respectively; the amount of cetyltrimethylammonium bromide added was 3.65g; stirring was continued at room temperature for 3h, so that the NiO nanoparticles were evenly...

Embodiment 3

[0043] First, dissolve 1.25g nickel acetate tetrahydrate and 20g polyvinylpyrrolidone in ethanol solution, the volume ratio of alcohol to water is 1:0.5. After stirring until dissolved, transfer it to a polytetrafluoroethylene-lined hydrothermal kettle for hydrothermal reaction. The volume of the ethanol solution is 500mL, the hydrothermal reaction temperature is 140°C, and the hydrothermal reaction time is 8h. NiO nanoparticles were obtained after filtration and washing.

[0044] After ultrasonication of NiO nanoparticles for 60 min, they were uniformly dispersed in the solution, and ethanol, deionized water, ammonia water, and cetyltrimethylammonium bromide (CTAB) were added in sequence; ethanol, deionized water, and ammonia water were mixed The volumes of the solutions were 250mL, 250mL, and 20mL; the amount of cetyltrimethylammonium bromide added was 9.11g; stirring was continued at room temperature for 3h, so that the NiO nanoparticles were evenly dispersed in the solutio...

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Abstract

The invention discloses a preparation method of a NiO@SiO2@CoAl-LDH multistage core-shell catalyst, wherein the method is characterized by comprising the steps: dissolving a nickel source and polyvinylpyrrolidone in an alcoholic solution to react, to obtain NiO nanoparticles; adding the NiO nanoparticles into a mixed solution of ethanol, deionized water, ammonia water and hexadecyl trimethyl ammonium bromide, then adding tetraethoxysilane to obtain NiO@SiO2, dispersing the NiO@SiO2 into an alumina sol, and repeating for multiple times to obtain NiO@SiO2@AlOOH with different alumina sol coatingthicknesses; dissolving a cobalt source and NH4F in deionized water, adding NiO@SiO2@AlOOH, and reacting; and drying, roasting and reducing to obtain the NiO@SiO2@Co-Al2O3 multistage core-shell catalyst. The catalyst has a multistage core-shell structure, so that the carbon deposition resistance and sintering resistance of Ni can be improved to a greater extent, the stability of the catalyst is greatly improved, and the service life of the catalyst is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of energy utilization and environment, and relates to a NiO@SiO 2 Preparation method of @CoAl-LDH multi-level core-shell catalyst and its application in carbon dioxide reforming reaction of methane. Background technique [0002] To address greenhouse gases (CH 4 , CO 2 ) global warming caused by rising concentration, CH 4 and CO 2 The removal, treatment and chemical utilization of spores have become the focus of research. Dry reforming of methane and carbon dioxide (DRM) is not only capable of converting these two major greenhouse gases into industrially valuable syngas (V H2 / V CO ≈1), and the synthesis gas can be used for the synthesis of long-chain hydrocarbons or oxygenates. Ni-based catalysts are considered to be the most promising catalysts for industrialization due to their low economic cost and high activity. However, under severe reforming conditions, Ni-based catalysts are easily deactivate...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J37/10B01J37/08B01J37/18B82Y30/00B82Y40/00C01B3/40
CPCB01J23/755B01J37/10B01J37/082B01J37/18B82Y30/00B82Y40/00C01B3/40C01B2203/0238C01B2203/1241C01B2203/1058C01B2203/1052C01B2203/1041B01J35/397B01J35/393B01J35/23B01J35/33B01J35/40Y02P20/52
Inventor 孙予罕王慧张磊马春辉杜洋
Owner 上海簇睿低碳能源技术有限公司
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