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A kind of preparation method of core-shell structure catalyst for low-temperature catalytic oxidation of toluene

A low-temperature catalysis, core-shell structure technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of size increase, uneven dispersion, and activity decline and other problems, to achieve the effect of good low temperature, solving sintering growth, good catalytic activity and stability

Active Publication Date: 2021-12-21
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the supported Au NPs are not uniformly dispersed on the surface of the carrier, and are easy to agglomerate and re-grow and increase in size during use, resulting in a decrease in activity.

Method used

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  • A kind of preparation method of core-shell structure catalyst for low-temperature catalytic oxidation of toluene
  • A kind of preparation method of core-shell structure catalyst for low-temperature catalytic oxidation of toluene
  • A kind of preparation method of core-shell structure catalyst for low-temperature catalytic oxidation of toluene

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preparation example Construction

[0029] The present invention is a method for preparing the low-temperature catalytic oxidation of toluene core-shell structure of the catalyst, comprising the steps of:

[0030] First, the chloroauric acid solution at a concentration formulated in a water bath and heated to a predetermined temperature, adding an appropriate amount of reducing agent Au 4+ , A predetermined time after the reaction, the resulting reaction solution was centrifuged, washed, and dried available Au NPs.

[0031] Then, the Au NPs uniformly dispersed in an appropriate amount of a surfactant solution, adding a certain amount of copper nitrate solution was added to the above solution, after reduction of surface adsorption of Au NPs Stir with a strong reducing agent in situ Cu 2+ After a certain reaction time, the resulting solution was centrifuged, washed, and dried to give intermediate gold Au @ Cu 2 O.

[0032] Finally, the Au @ Cu 2 O was added tert-butanol and drying a mixed solution of sodium chloride, ...

Embodiment 1

[0035] After ① Firstly, the prepared 0.25mmol / L chloroauric acid solution was heated to 100 deg.] C water bath, followed by addition of 7.5ml0.1mol / L sodium citrate solution, with magnetic stirring 30min, the resulting reaction solution was centrifuged, washed, dried available gold nanoparticles (Au NPs).

[0036]2 The obtained Au NPS was evenly dispersed in a 1 g of polyvinylpyrrolidone solution, and 50 ml of 0.1 mol / L of a copper nitrate solution was added to the solution, and the mixture was mixed after uniformly reducing the Au NPS surface adsorption of Au NPS. 2 + After 30 min, the resulting solution can be centrifted, washed, and dry, and then the intermediate product Au @ cu 2 O.

[0037] 3 will be au @ cu 2 O dried to add 20 ml of tert-butanol and 1 ml of 1.71 mol / l sodium chloride mixed solution, to be Au @ cu 2 O Netherly dispersion and then add 0.15 mol / L hydrochloric acid acidified potassium permanganate solution (0.158 mol / L) in situ oxidation Au @ cu 2 O...

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Abstract

A method for preparing a core-shell structure catalyst for low-temperature catalytic oxidation of toluene, relating to a method for preparing a catalyst, preparing a solution with chloroauric acid and heating it in a water bath, adding a reducing agent to reduce Au 4+ , to obtain gold nanoparticles (Au NPs). The obtained Au NPs were uniformly dispersed in a surfactant, and copper nitrate solution was added to in situ reduce the Cu adsorbed on the surface of Au NPs with a strong reducing agent. 2+ , to get the intermediate product Au@Cu 2 O core-shell structure. Au@Cu 2 O is added to the mixed solution of tert-butanol and sodium chloride after drying, and acidified potassium permanganate solution is added to oxidize and etch Cu 2 O is Au@MnO 2 catalyst. Its low-temperature catalytic activity is excellent, and the temperature of the optimal catalyst to completely oxidize and remove toluene is about 230ºC. The preparation method of the invention is simple and efficient, suitable for industrial production, and has outstanding practical value. Catalysts can be used for efficient oxidation removal of volatile organic compounds (VOCs).

Description

Technical field [0001] The present invention relates to a method for preparing a catalyst, particularly to a method for preparing core-shell structure of a catalyst for the low temperature catalytic oxidation of toluene. Background technique [0002] In recent years, my country's rapid industrial and economic development, followed by increasingly serious environmental pollution, was undoubtedly one of the more prominent air pollution problems. Volatile organic compounds (VOCs) in itself only has a strong toxicity is also one of the important precursor of atmospheric haze, PM2.5 and ozone compound contamination, among the many VOCs, benzene VOCs because of its high toxicity and strong irritating, highly teratogenic and carcinogenic threat to human health is particularly prominent, is industrial production should be strictly control pollutant emissions. Therefore, efficient purification of BTEX VOCs removal techniques for improving air quality, has important theoretical and practic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68B01J35/02B01D53/86B01D53/72B01J35/00
CPCB01J23/688B01D53/8668B01D2257/7027B01J35/00B01J35/30Y02A50/20
Inventor 刘威王胜楠张学军
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY