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Core-shell structure catalyst and preparation method and application thereof

A technology of core-shell structure and catalyst, which is applied in the field of core-shell structure catalyst and its preparation, and can solve the problem of large particle size

Active Publication Date: 2018-12-04
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the core-shell catalysts used in the prior art for the preparation of dimethyl ether are tens of hundreds of microns in size, and there is a problem of large particle size

Method used

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  • Core-shell structure catalyst and preparation method and application thereof
  • Core-shell structure catalyst and preparation method and application thereof
  • Core-shell structure catalyst and preparation method and application thereof

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preparation example Construction

[0031] The invention provides a method for preparing a core-shell structure catalyst, comprising the following steps:

[0032] (1) mixing soluble zinc salt, soluble chromium salt and ethylene glycol to obtain a mixed solution;

[0033] (2) the mixed solution that described step (1) obtains is carried out solvothermal reaction, obtains ZnCr 2 o 4 Nanoparticle precursors;

[0034] (3) the ZnCr that described step (2) obtains 2 o 4 The nanoparticle precursor is calcined to obtain ZnCr 2 o 4 Nanoparticles;

[0035] (4) ZnCr that described step (3) obtains 2 o 4 Nanoparticles were mixed with glucose aqueous solution and subjected to hydrothermal reaction to obtain ZnCr 2 o 4 @Cparticles;

[0036] (5) soluble aluminum salt solution is added dropwise to the ZnCr that described step (4) obtains 2 o 4 @C particle ammonia solution, static aging to get ZnCr 2 o 4 @C@Al(OH) 3 particle;

[0037] (6) the ZnCr that described step (5) obtains 2 o 4 @C@Al(OH) 3 The particle...

Embodiment 1

[0072] Weigh 10g of zinc acetate and chromium acetate (the molar ratio of zinc acetate and chromium acetate is 1:2), add them into 80mL of ethylene glycol, heat and stir at 50°C for 30min, and obtain a mixed solution;

[0073] Transfer the mixed solution to a 100mL high-pressure reactor, and then put it in an oven at 160°C for 20 hours for solvothermal reaction, particle aggregation, Oswald aging, centrifuge to collect the precipitate, and wash with deionized water and ethanol two to three times respectively. get ZnCr 2 o 4 Prebody;

[0074] ZnCr 2 o 4 The precursor is dried in the air at 50°C for 10h, and roasted at 300°C for 5h to obtain ZnCr 2 o 4 Nanoparticles, the heating rate to the calcination temperature is 2°C / min, ZnCr 2 o 4 The particle size of the nanoparticles is 100nm;

[0075] Prepare 80mL of 0.2mol / L glucose aqueous solution and add ZnCr 2 o 4 Nanoparticles 0.1g, ultrasonically dispersed for 30min, then transferred to a 100mL autoclave at 180°C for 10...

Embodiment 2

[0086] Weigh 1g of zinc acetate and chromium acetate (the molar ratio of zinc acetate and chromium acetate is 1:2), add them into 80mL of ethylene glycol, heat and stir at 80°C for 30min to obtain a mixed solution;

[0087] Transfer the mixed solution to a 100mL high-pressure reactor, and then put it in an oven at 180°C for 10 hours for solvothermal reaction, particle aggregation, Oswald aging, centrifuge to collect the precipitate, and wash with deionized water and ethanol two to three times respectively. get ZnCr 2 o 4 Prebody;

[0088] ZnCr 2 o 4 The precursor is dried in air at 100°C for 12h, and roasted at 600°C for 10h to obtain ZnCr 2 o 4 Nanoparticles, the heating rate to the calcination temperature is 3°C / min, ZnCr 2 o 4 The particle size of the nanoparticles is 100nm;

[0089] Configure 80mL of 0.8mol / L glucose aqueous solution and add ZnCr 2 o 4 Nanoparticles 0.5g were ultrasonically dispersed for 30min, then transferred to a 100mL autoclave at 160°C for 1...

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Abstract

The invention provides a preparation method of a core-shell structure catalyst, and belongs to the technical field of inorganic catalysts. The core-shell structure catalyst prepared by the invention has a particle diameter of 800-900 nm, ZnCr2O4 is taken as a core and gamma-Al2O3 is taken as a shell, ZnCr2O4 has synergistic effect with gamma-Al2O3, in the preparation of dimethyl ether, ZnCr2O4 isused to catalyze the carbon monoxide and hydrogen for synthesis of methanol, gamma-Al2O3 is dehydrated to synthesize dimethyl ether, carbon monoxide and hydrogen are reacted through one step to form dimethyl ether, the cost is saved, the operation is easy, the conversion rate of the product is greatly improved, and the total yield is high.

Description

technical field [0001] The invention relates to the technical field of inorganic catalysts, in particular to a catalyst with a core-shell structure and its preparation method and application. Background technique [0002] DME has excellent combustion performance and is known as a green fuel in the 21st century. DME can be prepared by a traditional two-step method, that is, synthetic gas is synthesized into methanol on a copper-zinc-based catalyst, and then methanol is dehydrated on an acidic catalyst to produce DME. If methanol synthesis and methanol dehydration reaction are coupled, that is, one-step method to prepare dimethyl ether, the conversion rate will be greatly improved, which is more economically beneficial. [0003] Most of the core-shell structure catalysts used in the prior art for the preparation of dimethyl ether are tens of hundreds of microns in size, and there is a problem of large particle size. Contents of the invention [0004] In view of this, the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01J35/02C07C43/04C07C41/09C07C31/04C07C29/153
CPCC07C29/153C07C41/09B01J23/26B01J35/50B01J35/40C07C31/04C07C43/043Y02P20/52
Inventor 冯绍杰申红亮黄伟査惟伟
Owner ANHUI UNIVERSITY OF ARCHITECTURE