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Nano-copper catalyst, preparation method thereof and application to synthesis of acetic acid or ammonia

A catalyst, nano-copper technology, applied in nano-copper catalyst and its preparation, application field in synthesizing acetic acid or ammonia, can solve the problems of low ammonia production rate and current efficiency, limited application, etc., achieve clear structure, efficiency and selectivity High and regular appearance

Active Publication Date: 2019-08-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some research progress has been made in the synthesis of ammonia by electroreduction of nitrogen, but the ammonia production rate and current efficiency are extremely low, usually 0.1-30 μg mg -1 cat h -1 and 0.1 to 10%, limiting its potential application

Method used

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  • Nano-copper catalyst, preparation method thereof and application to synthesis of acetic acid or ammonia
  • Nano-copper catalyst, preparation method thereof and application to synthesis of acetic acid or ammonia
  • Nano-copper catalyst, preparation method thereof and application to synthesis of acetic acid or ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of nano-copper catalyst, this catalyst comprises carbon paper substrate and the copper nano sheet that is loaded on carbon paper, and the loading capacity of copper nano sheet on carbon paper is 1.0mg / cm 2 about. The catalyst is prepared by the following method:

[0027] (1) Synthesis of copper nanosheets: Dissolve copper nitrate, ascorbic acid, hexamethylenetetramine and cetyltrimethylammonium bromide in deionized water at a molar ratio of 1:0.1:0.5:0.5, and stir to form Homogeneous solution, the solution is placed in an oil bath at 100°C for 2 hours, and after cooling, a mixture of ethanol and water is added for washing and centrifugation, and the precipitate is taken and dried to obtain an active agent, which is copper nanosheets;

[0028] (2) Clean copper nanosheets: prepare cleaning agent with ethanol and deionized water, and the volume ratio of ethanol and deionized water in the prepared cleaning agent is 1:9; 4 Hz frequency ultrasonic cleaning for 8min, ...

Embodiment 2

[0032] A nano-copper catalyst comprising a carbon cloth substrate and copper nanocubes loaded on the carbon cloth, the loading of the copper nanocubes on the carbon paper is 3.0 mg / cm 2 about. The catalyst is prepared by the following method:

[0033] (1) Clean copper nano cube: prepare cleaning agent with ethanol and deionized water, the volume ratio of ethanol and deionized water in the prepared cleaning agent is 1:1; Then the copper nano cube that will make is immersed in the cleaning agent, Take 8×10 4 Hz frequency ultrasonic cleaning for 5min, then dry for later use;

[0034] (2) Preparation of slurry: Add Nafion conductive binder with a concentration of 10% to the cleaned active agent, the mass ratio of Nafion to active agent is 1:1, then add appropriate amount of ethanol, fully stir and disperse After obtaining the slurry;

[0035] (3) Catalyst preparation: the slurry was uniformly coated on the surface of carbon paper and dried with nitrogen flow to obtain a cataly...

Embodiment 3

[0037] A kind of nano-copper catalyst, this catalyst comprises carbon paper substrate and the copper nanowire that is loaded on carbon paper, and the loading capacity of copper nanowire on carbon paper is 0.5mg / cm 2 about. The catalyst is prepared by the following method:

[0038] (2) Clean copper nanowires: prepare cleaning agent with ethanol and deionized water, the volume ratio of ethanol and deionized water in the prepared cleaning agent is 4:1; Then the copper nanowires prepared are immersed in the cleaning agent, to 4×10 4 Hz frequency ultrasonic cleaning for 10min, then dry for later use;

[0039] (3) Preparation of slurry: Add Nafion conductive binder with a concentration of 10% to the cleaned active agent, the mass ratio of Nafion to active agent is 1:4, then add appropriate amount of ethanol, fully stir and disperse After obtaining the slurry;

[0040] (4) Catalyst preparation: the slurry was uniformly coated on the surface of carbon paper and dried with nitrogen...

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Abstract

The invention discloses a nano-copper catalyst, a preparation method thereof and an application to synthesis of acetic acid or ammonia. The catalyst comprises a substrate and an active agent supportedon the substrate, wherein the active agent is a copper nanosheet with a [111] crystal plane exposed in a high proportion, a copper nano-polyhedron or a copper nanowire, and the supporting capacity ofthe active agent on the substrate is 0.1-3.0 mg / cm<2>. The active agent exists in air stably and has performance of selectively catalyzing carbon monoxide and carbon dioxide into acetic acid (acetate), and the yield is as high as 48%, that is, the active agent has industrial value; the copper nanomaterial with the [111] crystal plane exposed has performance of efficiently catalyzing various nitrates into ammonia, and both yield and selectivity can reach almost 100%. With the adoption of the catalyst, the problems of high energy consumption and high pollution of ammonia synthesis with a traditional Haber process and low efficiency of ammonia synthesis based on traditional electrochemical nitrogen reduction can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a nano-copper catalyst, a preparation method thereof and an application in synthesizing acetic acid or ammonia. Background technique [0002] Under the premise of the current limited reserves of fossil energy, the world is working hard to find new energy, and the most promising hydrogen energy system uses hydrogen as the energy carrier. However, the hydrogen energy system cannot provide chemical products other than energy for human society like the petroleum energy system. Scientists are committed to synthesizing high-value multi-carbon compounds from the abundantly available small molecules in the environment (such as hydrogen, oxygen, water, carbon monoxide, carbon dioxide) to meet the needs of daily chemical products. However, this synthetic route has problems such as low reaction rate, high difficulty in producing high-value products, and high industrial produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72C07C51/00C07C53/08C25B1/00C25B11/06C25B3/25
CPCB01J23/72C07C51/00C25B1/00C25B11/075B01J35/33C07C53/08C25B1/27C25B11/052C25B11/065C25B11/067C25B11/081Y02P20/52C25B3/25C25B11/051
Inventor 康毅进付先彪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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