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Surface sulfur-modified porous copper-based composite catalyst as well as preparation method and application thereof

A composite catalyst and porous copper technology, which can be used in the preparation/separation of ammonia, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems of low catalytic activity of porous metal catalysts

Active Publication Date: 2020-10-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of low catalytic activity of existing porous metal catalysts, the object of the present invention is to provide a surface sulfur-modified porous copper-based composite catalyst and its preparation method and application, and to control the sulfide degree of porous copper through polysulfide solution , sulfur is adsorbed on the surface of porous copper to modify it, and the sulfur atoms on the surface can not only enhance the N by adjusting the electronic properties 2 Adsorption, and can directly participate in the catalytic process by accepting and donating H atoms, thereby significantly improving its catalytic performance

Method used

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  • Surface sulfur-modified porous copper-based composite catalyst as well as preparation method and application thereof
  • Surface sulfur-modified porous copper-based composite catalyst as well as preparation method and application thereof
  • Surface sulfur-modified porous copper-based composite catalyst as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0037] Preparation of porous copper:

[0038] (1) First configure a sulfuric acid solution with a concentration of 0.5mol / L, take 200mL of the solution and add it to a 500mL beaker, and add 5.0g of Cu while stirring 40 Zn 60 Powder, stirred at room temperature for 2h;

[0039] (2) The obtained product was washed with deionized water until the supernatant was neutral, and the solid was collected by centrifugation at 5000 rpm for 10 min, and vacuum-dried at 60° C. for 1 h to obtain porous copper powder.

Embodiment 1

[0041] Preparation of 3%-S / Cu catalyst:

[0042] (1) Take 0.7mL of prepared polysulfide solution and 100mg of porous copper powder, mix them in 20mL of aqueous solution, and stir at room temperature for 1h;

[0043] (2) The obtained product was washed 3 times with deionized water, centrifuged at 5000rpm for 10min to collect the solid, and vacuum-dried at 60°C for 1h to obtain the obtained product, which was recorded as 3%-S / Cu.

[0044] Photocatalytic synthesis of ammonia:

[0045] (1) Add 10 mg of 3%-S / Cu catalyst and 20 mL of deionized water into a 100-mL photoreactor;

[0046] (2) At room temperature, blow nitrogen into the suspension at a flow rate of about 30mL min-1 for 30 minutes, then vigorously stir the suspension while irradiating it with a light source;

[0047] (3) record the productive rate of synthetic ammonia after the reaction, the ammonia productive rate under its different light sources is shown in Table 2:

[0048] Table 2 Ammonia yields of 3%-S / Cu cataly...

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Abstract

The invention discloses a surface sulfur-modified porous copper-based composite catalyst as well as a preparation method and application thereof. The surface sulfur-modified porous copper-based composite catalyst is prepared by mixing and reacting a polysulfide solution and porous copper powder, wherein the sulfur is adsorbed on the surface of porous copper, and the molar ratio of S to Cu is 3:100. According to the method, the vulcanization degree of the porous copper is controlled through the polysulfide solution, sulfur is adsorbed to the surface of the porous copper to modify the porous copper, sulfur atoms on the surface can enhance N2 adsorption by adjusting the electronic property, H atoms can be accepted and contributed to directly participate in the catalytic process, and then thecatalytic performance of the porous copper is remarkably improved. The preparation process of the composite catalyst is simple, and the catalyst is high in activity, stable in property and capable ofbeing repeatedly used when used for photocatalytic synthesis of ammonia.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic ammonia synthesis, and relates to a surface sulfur-modified porous copper-based composite catalyst, a preparation method thereof and an application in photocatalytic ammonia synthesis. Background technique [0002] Ammonia (NH 3 ) is an important chemical substance, and the global annual ammonia production exceeds 150 million tons, which promotes population growth and the development of modern society. Ammonia is produced industrially by converting N 2 and H 2 Converted to NH at high temperature and pressure 3 , the process consumes a lot of energy and emits millions of tons of CO 2 into the atmosphere, causing serious pollution to the earth's environment. Therefore N 2 Converts to NH under mild conditions 3 The response of methionine has attracted great attention because it can meet the current energy and environmental demands. Similar to biological nitrogenases under mild conditio...

Claims

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Application Information

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IPC IPC(8): B01J27/04C01C1/04
CPCB01J27/04C01C1/0411B01J35/39Y02P20/52
Inventor 王梁炳辛月原海波刘曼君
Owner CENT SOUTH UNIV