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A kind of zif-8 film-coated pd/zno core-shell catalyst and preparation method thereof

A core-shell catalyst, ZIF-8 technology, applied in the direction of physical/chemical process catalyst, catalyst protection, organic compound/hydride/coordination complex catalyst, etc., to achieve wide application prospects and solve the effect of easy loss

Active Publication Date: 2017-02-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to propose a metal-organic framework ZIF-8 film-coated supported noble metal core-shell catalyst and its preparation method in view of the disadvantages of the current preparation of heterogeneous catalysts

Method used

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  • A kind of zif-8 film-coated pd/zno core-shell catalyst and preparation method thereof
  • A kind of zif-8 film-coated pd/zno core-shell catalyst and preparation method thereof
  • A kind of zif-8 film-coated pd/zno core-shell catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Preparation of PVP-stabilized Pd nanoparticles

[0024] Prepare 2mM H 2 PdCl 4 Aqueous solution 15ml, with 0.0667g PVP, 21ml H 2 O mixed, adding 1M HCl aqueous solution to adjust the mixture pH = 9, heated to boiling, immediately added 14ml of ethanol, refluxed for 3h, to obtain Pd nanoparticles stabilized by PVP;

[0025] (2) Preparation of ZnO carrier

[0026] Mix 1.098g of zinc acetate dihydrate with 50ml of diethylene glycol (DEG), and reflux at 160°C for 2 hours to obtain a spherical ZnO carrier with a particle size of 300-500nm;

[0027] (3) The PVP stabilized Pd nanoparticles obtained in step (1) are mixed with the spherical ZnO carrier obtained in step (2) at room temperature for 15h to obtain the ethanol solution of the Pd / ZnO catalyst;

[0028] (4) The ethanol solution of the Pd / ZnO catalyst obtained in step (3) is mixed with the 2-methylimidazole solution, wherein the concentration of 2-methylimidazole is 0.5M, and the molar amount of 2-methylimidazol...

Embodiment 2

[0031] (1) Preparation of PVP-stabilized Pd nanoparticles

[0032] Prepare 2mM H 2 PdCl 4 Aqueous solution 15ml, with 0.0667g PVP, 21ml H 2 O mixed, adding 1M HCl aqueous solution to adjust the mixture pH = 9, heated to boiling, immediately added 14ml of ethanol, refluxed for 3h, to obtain Pd nanoparticles stabilized by PVP;

[0033] (2) Preparation of ZnO carrier

[0034] Mix 1.098g of zinc acetate dihydrate with 50ml of diethylene glycol (DEG), and reflux at 160°C for 2 hours to obtain a spherical ZnO carrier with a particle size of 300-500nm;

[0035] (3) The PVP stabilized Pd nanoparticles obtained in step (1) are mixed with the spherical ZnO carrier obtained in step (2) at room temperature for 15h to obtain the ethanol solution of the Pd / ZnO catalyst;

[0036] (4) The ethanol solution of the Pd / ZnO catalyst obtained in step (3) was vacuum-dried overnight at 80° C., and placed in a desiccator for testing.

Embodiment 3

[0038] Take 0.1g of catalyst and put it in the reaction device, then add 15ml of ethyl acetate and 0.3ml of n-hexene, use hydrogen to purge the reaction device for 3 times, and react at 35°C for 24h. After the reaction, the catalyst and feed liquid were centrifuged, and the results were detected by gas chromatography (chromatographic column: HP-5; FID).

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Abstract

One kind of ZIF-8 film-coated Pd / ZnO core-shell catalysts, the present invention is in the field of new materials. Pd / ZnO ZnO as the carrier core is spherical, particle diameter of the spherical support is 300-500 nm ZnO, ZnO spherical support is formed by the accumulation of ZnO nanoparticles from 20-40nm; PVP at Pd nanoparticles stabilized active center; package cover Pd / ZIF-8 is the core thickness of the ZnO film 100-150nm. Spherical ZnO carrier and PVP stabilized Pd nanoparticles were mixed and stirred, was added a solution of 2-methylimidazole and action ZnO, Pd / outer surface of the ZnO film obtained ZIF-8. Having a molecular sieving function ZIF-8 film supported noble metal catalysts gives high selectivity to the reactants and products; also help solve the heterogeneous catalyst active component easily lost in the reaction, poisoning, resulting in the problem of reduced activity.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a ZIF-8 film-coated Pd / ZnO core-shell catalyst and a preparation method thereof. Background technique [0002] Metal organic frameworks (MOFs) are porous crystalline materials that are self-assembled by metal ions or metal clusters and organic ligands through covalent or ion-covalent interactions. It has outstanding advantages such as high specific surface area, porosity, and adjustable skeleton structure, and has great application potential in gas storage and separation, heterogeneous catalysis, molecular recognition, and sensing. Coating functional nanoparticles with MOFs film can effectively solve the problems of particle agglomeration, loss, poisoning, etc., and at the same time combine the functions of nanoparticles themselves with the characteristics of MOFs to obtain a new type of multifunctional core-shell material. . [0003] Zeolitic imidazolate frameworks (ZI...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26B01J33/00B01J35/02C07C5/03C07C9/15C07C13/18B01J35/00
Inventor 张雄福林露张通刘海鸥邱介山
Owner DALIAN UNIV OF TECH