A preparation method and application method of a highly dispersed copper-zinc catalyst for carbon dioxide reduction

A carbon dioxide, highly dispersed technology, applied in the direction of catalyst activation/preparation, carbon monoxide, physical/chemical process catalysts, etc., can solve the problems of poor thermal stability of catalysts, reduction of catalytic activity, deactivation, etc., to improve catalytic performance and catalytic performance Enhancement and anti-agglomeration effects

Active Publication Date: 2021-07-27
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A preparation method and application method of a highly dispersed copper-zinc catalyst for carbon dioxide reduction
  • A preparation method and application method of a highly dispersed copper-zinc catalyst for carbon dioxide reduction

Examples

Experimental program
Comparison scheme
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 proposes a method for preparing and using a highly dispersed copper-zinc catalyst for carbon dioxide reduction. The method first synthesizes copper oxide nanoparticle precursors with uniform particle size, and then prepares copper oxide composite nanomaterials coated with ZIF-8 MOFs through liquid phase synthesis, and obtains nitrogen-doped carbon skeleton-coated composite nanomaterials after temperature-programmed calcination. Highly dispersed copper zinc catalyst. The feature of the present invention is that the method adds copper oxide nanoparticles in the process of preparing MOFs material ZIF-8, so that the copper oxide nanoparticles are evenly loaded in MOFs in situ, and the highly dispersed carbon skeleton coating is obtained after high-temperature calcination. At the same time as zinc, the reduction and redispersion of copper are also realized, and there are also a large amount of pyridine nitrogen in the carbon skeleton. A new preparation technology for highly dispersed copper-zinc catalysts supported by pyridine nitrogen doped carbon skeletons has been developed, and the The catalyst is used in the hydrogenation reduction reaction of carbon dioxide to prepare carbon monoxide, and has excellent catalytic activity. The highly dispersed copper-zinc active sites and the presence of a large amount of pyridinic nitrogen can greatly promote the improvement of 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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/08C01B32/40
Inventor 李伟胡小松关庆鑫
Owner NANKAI UNIV
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