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Preparation method of highly-dispersed copper-zinc catalyst for carbon dioxide reduction and use method thereof

A carbon dioxide, high dispersion technology, applied in catalyst activation/preparation, carbon monoxide, physical/chemical process catalysts, etc., can solve the problems of reduced catalytic activity, catalyst differential thermal stability, deactivation, etc., to achieve high activity and improve catalytic performance. , the effect of promoting adsorption

Active Publication Date: 2019-05-14
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally believed that the higher the content of metal nanoparticles, the smaller and more dispersed the particles, the higher the catalytic activity. For the RWGS reaction, according to formula (1), the higher the temperature, the more favorable the reaction is. However, high temperature It will cause the sintering of copper nanoparticles, resulting in the reduction or even deactivation of the catalytic activity, and the poor thermal stability of the catalyst severely limits its application.

Method used

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  • Preparation method of highly-dispersed copper-zinc catalyst for carbon dioxide reduction and use method thereof
  • Preparation method of highly-dispersed copper-zinc catalyst for carbon dioxide reduction and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Prepare an ethylene glycol solution with a mass fraction of 10% copper nitrate, weigh 100 g of the solution, add 2 g of water, stir at room temperature for 1 hour, then add 2 g of acetic acid, and continue stirring for 1 hour at room temperature to obtain mixed solution A;

[0040] (2) Transfer the mixed solution A to a hydrothermal reaction kettle, and react at a constant temperature at 180 °C for 6 hours, then take out the reaction kettle, cool to room temperature, and obtain sample B;

[0041] (3) Prepare a zinc nitrate methanol solution with a mass fraction of 5%, weigh 200 g of the solution, add 50 g of sample B to it, and stir at room temperature for 30 minutes to obtain sample C;

[0042] (4) Prepare 2-methylimidazole methanol solution with a mass fraction of 5%, mix 600 g with sample C, stir at room temperature for 6 hours, centrifuge and wash, dry at 80 °C for 4 hours, and then Dry at 120°C for 4 hours to obtain sample D;

[0043] (5) Under the flowing ni...

Embodiment 2

[0045] (1) Prepare a glycerin solution of copper nitrate with a mass fraction of 10%, weigh 150 g of the solution, add 4 g of water, stir at room temperature for 1 hour, then add 4 g of acetic acid, and continue stirring for 1 hour at room temperature to obtain a mixed solution A;

[0046] (2) Transfer the mixed solution A to a hydrothermal reactor and react at a constant temperature of 160 °C for 12 hours, then take out the reactor and cool it to room temperature to obtain sample B;

[0047] (3) Prepare a zinc chloride methanol solution with a mass fraction of 5%, weigh 200 g of the solution, add 80 g of sample B to it, and stir at room temperature for 30 minutes to obtain sample C;

[0048] (4) Prepare 2-methylimidazole methanol solution with a mass fraction of 5%, mix 800 g with sample C, stir at room temperature for 12 hours, centrifuge and wash, dry at 80 °C for 4 hours, and then Dry at 120°C for 4 hours to obtain sample D;

[0049] (5) Under the flowing nitrogen gas at...

Embodiment 3

[0051] (1) Prepare an isopropanol solution of copper nitrate with a mass fraction of 10%, weigh 100 g of the solution, add 2 g of water, stir at room temperature for 1 hour, then add 2 g of acetic acid, and continue stirring for 1 hour at room temperature to obtain mixed solution A;

[0052] (2) Transfer the mixed solution A to a hydrothermal reaction kettle, and react at a constant temperature of 180 °C for 12 hours, then take out the reaction kettle, cool to room temperature, and obtain sample B;

[0053] (3) Prepare a zinc acetate methanol solution with a mass fraction of 5%, weigh 200 g of the solution, add 50 g of sample B to it, and stir at room temperature for 30 minutes to obtain sample C;

[0054] (4) Prepare 2-methylimidazole methanol solution with a mass fraction of 5%, mix 400 g with sample C, stir at room temperature for 6 hours, centrifuge and wash, dry at 80 °C for 4 hours, and then Dry at 120°C for 4 hours to obtain sample D;

[0055] (5) Under the flowing ni...

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Abstract

The invention provides a preparation method of a highly-dispersed copper-zinc catalyst for carbon dioxide reduction and a use method thereof. The preparation method comprises the steps of firstly, synthesizing a copper oxide nano-particle precursor with uniform particle sizes; then preparing a ZIF (Zeolitic Imidazolate Framework)-8 MOFs (Metal Organic Frameworks)-coated copper oxide composite nanomaterial through liquid phase synthesis; and calcining the nano material through temperature programming to obtain the nitrogen-doped carbon framework-coated highly-dispersed copper-zinc catalyst. The preparation method is characterized in that the copper oxide nano-particles are added in the process of preparing the ZIF-8 of the MOFs material, so that the copper oxide nano-particles are uniformly loaded in the MOFs in situ, the copper reduction and redispersion are implemented while the carbon framework-coated highly-dispersed zinc is obtained after high temperature calcination; a large amount of pyridine nitrogen is also present in the carbon framework; a novel preparation technology of a pyridine nitrogen-doped and carbon framework-supported highly-dispersed copper-zinc catalyst is developed; the catalyst is applied to the carbon monoxide hydrogenation reduction reaction to produce carbon monoxide, and has excellent catalytic activity; the highly-dispersed copper-zinc active sitesand the presence of a large amount of pyridine nitrogen have great promotion actions on improvement of the catalytic activity.

Description

technical field [0001] The invention provides a method for preparing a highly dispersed copper-zinc catalyst for carbon dioxide reduction and a method for using it, belonging to the technical field of material synthesis. The catalyst uses copper oxide and zinc ions as precursors, and then prepares ZIF-8 MOFs-coated copper oxide composite nanomaterials through liquid-phase synthesis in situ loading. After temperature-programmed calcination, nitrogen-doped carbon skeleton-coated high Dispersed copper zinc catalyst. The catalyst is used to catalyze the reduction reaction of carbon dioxide and has good catalytic activity. Background technique [0002] The burning of fossil fuels leads to a large amount of carbon dioxide emissions, causing the greenhouse effect, thereby accelerating global warming. Therefore, the capture, storage and utilization of carbon dioxide is particularly urgent. Among them, the chemical conversion of carbon dioxide has become one of the most promising ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08C01B32/40
Inventor 李伟胡小松关庆鑫
Owner NANKAI UNIV
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