A kind of preparation method and application of silver-doped copper nanosheet catalyst

A catalyst and copper nanotechnology, which is applied in the field of preparation of silver-doped copper nanosheet catalysts, can solve the problems of low catalytic yield, low catalyst selectivity, low Faraday efficiency, etc., and achieve clean and pollution-free products, low cost, The effect of reducing the reaction cost

Active Publication Date: 2022-08-09
JILIN UNIV
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Problems solved by technology

[0004] In order to overcome the problems of low catalytic yield, low Faradaic efficiency, and low selectivity of the catalyst due to the hydrogen evolution reaction of the competing reaction of the existing nitrogen reduction catalysts, the present invention provides a high-efficiency electrochemical process using electrodeposition. Preparation method and application of silver-doped copper nanosheet catalyst for nitrogen reduction synthesis of ammonia

Method used

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  • A kind of preparation method and application of silver-doped copper nanosheet catalyst
  • A kind of preparation method and application of silver-doped copper nanosheet catalyst
  • A kind of preparation method and application of silver-doped copper nanosheet catalyst

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Embodiment 1

[0034] Weigh 0.8~1.6g of CuSO respectively 4 ·5H 2 O and 20-50 mg of 3,5-diamino-1,2,4-triazole (DAT), respectively, were dissolved in 15-20 ml of deionized water; then the two reactant solutions were mixed and stirred uniformly, and then added to Add 0.5mM AgNO to the mixed solution 3 solution, after fully stirring, use 1M H 2 SO 4 The pH of the solution was adjusted to 2 to 3; then the mixed solution was placed in a three-electrode system, with carbon paper as the working electrode, Ag / AgCl electrode as the reference electrode, and graphite electrode as the counter electrode, and the electro-deposition of the catalyst was carried out by chronoamperometry. , set the deposition voltage to -2 to -4 mA, and set the deposition time to 0.5 to 2 min to obtain Ag-Cu / CP. DAT composite material.

Embodiment 2

[0044] Ag-Cu / CP prepared in Example 1 was used respectively DAT Composite material, Ag-Cu / CP prepared in Comparative Example 1 DAT The Ag-Cu / CP composite material prepared in Comparative Example 2 was used as a catalyst for electrochemical ammonia synthesis reaction.

[0045] The electrochemical ammonia synthesis reaction is carried out in an H-type electrolytic cell. The working electrode is the carbon paper loaded with catalyst and the Ag / AgCl electrode as the reference electrode is in the same room, and the platinum sheet electrode is used as the counter electrode in another room. The protons are separated by a proton exchange membrane. An equal amount of 0.1M Na was added to the two chambers 2 SO 4 As an electrolyte, high-purity argon and high-purity nitrogen were respectively introduced into the electrolyte for 30 min each before the electrochemical nitrogen reduction reaction to synthesize ammonia to remove the impurity gas in the electrolyte. Nitrogen reduction synt...

Embodiment 3

[0047] Weigh 0.45-0.9 g of NaOH, dissolve it in 5-10 mL of deionized water, add 10-20 mL of sodium hypochlorite to the solution after fully dissolving, stir well to obtain a color developing solution a; weigh 1-2 g of salicylic acid and 0.8~1.6g of NaOH, dissolve in 20~40mL deionized water, fully dissolve to obtain color developing solution b; Weigh 0.1~0.2g of nitroprusside and dissolve in 10~20mL deionized water, fully dissolve to obtain color development liquid c.

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Abstract

The present invention provides a preparation method and application of silver -doped copper nano tablet catalysts.This catalyst uses carbon paper as a carrier, and prepare silver doped copper nanosioplasm catalysts through electrochemical deposits; Among them, the ripple -shaped CU nanoson piece obtained by electricity has provided a higher active area to reflectPoints are conducive to the transfer of electronics; the synergistic role of the trace AG atoms doped into copper nano -tablets and its surrounding CU atoms play a major catalytic role, which is conducive to the adsorption of nitrogen;The addition of 2,4‑ trifle as a surfactant is conducive to the catalyst appearance obtained by controlling the deposition.The catalysts obtained by the present invention have good appearance, high ammonia production, good stability, and strong selectivity. Faraday efficiency can exceed 20 %, showing excellent catalytic properties.The preparation method is simple, the cost is low, and it has high repetitiveness. It provides a new way for high -efficiency electrochemical synthetic ammonia and has broad application prospects.

Description

Technical field: [0001] The invention relates to a preparation method of a silver-doped copper nanosheet catalyst and its application as a catalyst in the electrocatalytic nitrogen reduction reaction to synthesize ammonia. Background technique: [0002] Fossil energy is over-exploited and consumed, causing the world's energy shortage problem. At the same time, the environmental pollution and greenhouse effect caused by the burning of fossil energy prompts people to look for sustainable, clean and renewable energy. With an annual global production of more than 145 million tons, ammonia is an important part of the global economy. At the same time, ammonia economy is also a key link in my country's industrial production and national economic development. As an efficient and carbon-free energy carrier, ammonia plays an important role in the production of fertilizers, fuels, pharmaceuticals and other fields. In addition, ammonia has a hydrogen content of up to 17.6% and is eas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/27C25B1/50C25B11/054C25B11/065C25B11/095
CPCC25B1/27C25B1/50C25B11/054C25B11/065C25B11/095Y02P20/52
Inventor 曲燕宾王智力崔玉环赵明文子蒋青
Owner JILIN UNIV
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