Preparation method for CuO/ZnO catalyst

A catalyst and aqueous solution technology, which is applied in the field of preparation of catalysts and CuO/ZnO catalysts, can solve the problems of uncontrollable ZnO exposed crystal planes, etc., and achieve the effects of large-scale production, good catalytic performance and low price

Inactive Publication Date: 2015-12-02
SHANGHAI INST OF TECH
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Problems solved by technology

[0004] Aiming at the technical problems in the prior art, the present invention provides a method for preparing a CuO / ZnO catalyst. The method for preparing the CuO / ZnO catalyst solves the problem that the preparation method in the prior art cannot control the exposed crystals of ZnO. face technical issues

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  • Preparation method for CuO/ZnO catalyst
  • Preparation method for CuO/ZnO catalyst
  • Preparation method for CuO/ZnO catalyst

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Effect test

Embodiment 1

[0025] A method for preparing CuO / ZnO catalyst is to first prepare ZnO crystals with preferential crystal planes by hydrothermal method, and then use mechanical grinding method to load CuO. The preparation process specifically includes the following steps:

[0026] (1) Weigh 5.00 g of zinc acetate and add it to 20 mL of deionized water to obtain an aqueous solution of zinc acetate with a concentration of 0.57 mol / L;

[0027] Weigh 3.19g of hexamethylenetetramine and add it to 20mL of deionized water to obtain a 0.57mol / L hexamethylenetetramine aqueous solution;

[0028] (2) Mix the hexamethylenetetramine aqueous solution and the zinc acetate aqueous solution in equal volumes and stir evenly to obtain a mixed solution. Transfer the mixed solution to a reaction kettle, keep it at 95°C for 12h, slowly cool to room temperature, and wash the white precipitate by centrifugation with distilled water and absolute ethanol for several times. The resulting white precipitate is dried at 60°C fo...

Embodiment 2

[0031] A method for preparing CuO / ZnO catalyst is to first prepare ZnO crystals with preferential crystal planes by hydrothermal method, and then use mechanical grinding method to load CuO. The preparation process specifically includes the following steps:

[0032] (1) Weigh 5.00 g of zinc acetate and add it to 20 mL of deionized water to obtain an aqueous solution of zinc acetate with a concentration of 0.57 mol / L;

[0033] Weigh 3.19g of hexamethylenetetramine and add it to 20mL of deionized water to obtain a 0.57mol / L hexamethylenetetramine aqueous solution;

[0034] (2) Mix the hexamethylenetetramine aqueous solution and the zinc acetate aqueous solution in equal volumes and stir evenly to obtain a mixed solution. Transfer the mixed solution to the reaction kettle, keep it at 95°C for 16h, slowly cool to room temperature, and wash the white precipitate by centrifugation with distilled water and absolute ethanol for several times. The resulting white precipitate is dried at 60°C ...

Embodiment 3

[0037] A method for preparing CuO / ZnO catalyst is to first prepare ZnO crystals with preferential crystal faces by using a hydrothermal method, and then use a mechanical grinding method to load CuO. The preparation process specifically includes the following steps:

[0038] (1) Weigh 5.00g zinc acetate and add it to 20mL deionized water to obtain a zinc acetate aqueous solution with a concentration of 0.57mol / L;

[0039] Weigh 3.19g of hexamethylenetetramine and add it to 20mL of deionized water to obtain a 0.57mol / L hexamethylenetetramine aqueous solution;

[0040] (2) Mix the hexamethylenetetramine aqueous solution and the zinc acetate aqueous solution in equal volumes and stir evenly to obtain a mixed solution. Transfer the mixed solution to the reaction kettle, keep it at 95°C for 24h, slowly cool to room temperature, and wash the white precipitate by centrifugation with distilled water and absolute ethanol for several times. The obtained white precipitate is dried at 60°C for 1...

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Abstract

The invention relates to a preparation method for a CuO/ZnO catalyst. The preparation method comprises: firstly preparing a zinc acetate aqueous solution and a hexamethylenetetramine aqueous solution with the concentration of 0.4-0.7 mol/L; mixing the hexamethylenetetramine aqueous solution with the zinc acetate aqueous solution isometrically and uniformly stirring the mixture to obtain a mixed solution; transferring the mixed solution to a reaction kettle; maintaining a constant temperature of 90-100 DEG C for 12-24 hours; naturally cooling the mixed solution to room temperature; sequentially washing white precipitate by distilled water and anhydrous ethanol; drying the white precipitate; and then roasting the white precipitate to obtain ZnO crystals; and loading CuO on ZnO by adopting a mechanical grinding method to obtain the CuO/ZnO catalyst. The preparation method firstly adopts a hydrothermal method to synthesize crystal face preferential ZnO crystals and then loads CuO on ZnO by adopting the mechanical grinding method to obtain the CuO/ZnO catalyst. The catalyst provided by the invention for CO2 hydrogenation to methanol shows a relatively good catalytic performance.

Description

Technical field [0001] The invention belongs to the field of chemical engineering, and relates to a catalyst, specifically a method for preparing a CuO / ZnO catalyst. Background technique [0002] ZnO is a semiconductor material with a hexagonal wurtzite crystal structure and a band gap width of 3.37 eV at room temperature. It is widely used in the field of photocatalysis. The literature (Guo Li, Wang Danjun, etc., Study on the surface catalytic activity characteristics of ZnO nanocrystals [J], Journal of Synthetic Crystals, 2011, 40(4): 1017-1021.) reported that the exposed crystal surface of ZnO crystals has photocatalytic activity Great influence. ZnO is an important carrier and auxiliary agent in copper-based catalysts. ZnO-supported copper-based catalysts can be used for CO 2 Hydrogenation to methanol reaction. [0003] At present, there are many reports on the preparation of CuO / ZnO catalysts, but most of them are limited to the preparation of co-precipitation methods, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80C07C31/04C07C1/12
CPCY02P20/52
Inventor 王艳辉郭晓明毛东森王嵩卢冠忠
Owner SHANGHAI INST OF TECH
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