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Copper-based catalyst with nanowire network structure, preparation method and application thereof

A technology of copper-based catalyst and network structure, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of waste of hydrogen source, incomplete nitrate reaction, etc., and achieve high nitrate The effect of reduction, high utilization rate of formic acid, and simple preparation method

Active Publication Date: 2020-11-17
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, provide a copper-based catalyst with a nanowire network structure and its preparation method and application, and be used to solve the technology of incomplete nitrate reaction and waste of hydrogen source in the prior art question

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  • Copper-based catalyst with nanowire network structure, preparation method and application thereof
  • Copper-based catalyst with nanowire network structure, preparation method and application thereof
  • Copper-based catalyst with nanowire network structure, preparation method and application thereof

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preparation example Construction

[0031] The preparation method specifically comprises the following steps:

[0032] First, mix polyvinylpyrrolidone and polyalcohol uniformly in a two-necked flask, wherein the ratio of the mass of polyvinylpyrrolidone to the volume of polyalcohol is 131 mg: (10-15) mL, and the polyalcohol is ethylene glycol and 1,3- Any of butanediol. One outlet of the two-necked flask is connected to the reflux pipe, open the circulating water, then heat the mixture in the two-necked flask to 200-220°C, and keep the temperature at reflux for 20-30 minutes; when refluxing, the other outlet of the two-necked flask is plugged with a rubber stopper. Secondly, add the aqueous solution of copper sulfate and palladium nitrate to the two-necked flask, continue to maintain magnetic stirring and reflux under the condition of 200-220 ℃ for 2-4 hours to carry out the reduction reaction, in the aqueous solution of copper sulfate and palladium nitrate, copper sulfate and The molar ratio of palladium nitra...

Embodiment 1

[0036] 1) First, mix 131mg of polyvinylpyrrolidone and 10mL of ethylene glycol in a two-necked flask uniformly. One outlet of the two-necked flask is connected to the reflux tube, open the circulating water, then heat the mixture in the two-necked flask to 220°C, and keep the temperature at reflux for 30 minutes; the other outlet of the two-necked flask is plugged with a rubber stopper during reflux. Next, add 4mL aqueous solution containing 0.1mmol copper sulfate and 0.1mmol palladium nitrate to the two-necked flask, continue to maintain magnetic stirring and reflux at a temperature of 220°C for 4h, then naturally cool the reaction flask to room temperature, and then pour the product in the flask Put it into a centrifuge tube, add 40mL acetone to the centrifuge tube, ultrasonically homogenize, put it in a centrifuge and centrifuge. Centrifuge washing again with a mixture of acetone and water to obtain a copper-based nanowire network structure, and finally disperse the catalys...

Embodiment 2

[0040] 1) First, mix 131mg of polyvinylpyrrolidone and 10mL of ethylene glycol in a two-necked flask uniformly. One outlet of the two-necked flask is connected to the reflux pipe, open the circulating water, then heat the mixture in the two-necked flask to 200°C, and keep the temperature at reflux for 30 minutes; the other outlet of the two-necked flask is plugged with a rubber stopper during reflux. Next, add 4mL aqueous solution containing 0.1mmol copper sulfate and 0.1mmol palladium nitrate to the two-necked flask, continue to maintain magnetic stirring and reflux at 200°C for 4h, then naturally cool the reaction flask to room temperature, and then pour the product in the flask Put it into a centrifuge tube, add 40mL acetone to the centrifuge tube, ultrasonically homogenize, put it in a centrifuge and centrifuge. Centrifuge washing again with a mixture of acetone and water to obtain a copper-based nanowire network structure, and finally disperse the catalyst in a certain vo...

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Abstract

The invention discloses a copper-based catalyst with a nanowire network structure, a preparation method and application thereof. The method comprises the following steps: forming copper-palladium nanoparticles from a copper source and a palladium source by using an alcohol thermal method, and then self-assembling the copper-palladium nanoparticles into a copper-based nanowire network structure, wherein the obtained copper-based nanowire network structure has super dispersion performance in a water phase. According to the invention, the copper-based nanowire network structure prepared by the method is composed of a copper-palladium alloy; when the copper-based nanowire network structure is used as a catalyst for reducing nitrate or nitrite in a water body, formic acid is mildly catalyzed atroom temperature to produce hydrogen, and nitrate or nitrite is further selectively reduced into nitrogen, wherein the copper-based nanowire network structure is used as a bifunctional catalyst to catalyze two chemical reactions in series, so that compared with silver-palladium alloy nano catalytic nitrate, the copper-based nanowire network structure has the advantages that the utilization rate of hydrogen source formic acid is greatly increased, the cost of the catalyst is reduced, and the material is beneficial to further large-scale research on a water body nitrate removal technology.

Description

【Technical field】 [0001] The invention belongs to the technical field of water body pollutant removal, and in particular relates to a copper-based catalyst with a nanowire network structure and a preparation method and application thereof. 【Background technique】 [0002] The increasingly serious global energy crisis and environmental pollution have attracted the attention of governments around the world, especially water pollution, and it has become one of the major challenges hindering the sustainable development of human society. Among all kinds of water pollution sources, the problem of nitrate pollution has become increasingly prominent, causing serious harm to human health and ecosystems. Therefore, the removal of nitrate has been gradually put on the agenda, and has become the focus and difficulty of current environmental protection. It is necessary to improve and develop the existing nitrate removal technology. The water quality standard promulgated by the World Heal...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/06B01J37/16C02F1/70C22C9/00C02F101/16
CPCB01J23/8926B01J37/16C02F1/70C22C9/00C02F2101/163C02F2101/166B01J35/40B01J35/58
Inventor 刘虎陈双莉孙小琴
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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