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Preparation method of core-shell-structured catalyst for low-temperature catalytic oxidation of toluene

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

Active Publication Date: 2019-10-11
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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  • Preparation method of core-shell-structured catalyst for low-temperature catalytic oxidation of toluene
  • Preparation method of core-shell-structured catalyst for low-temperature catalytic oxidation of toluene
  • Preparation method of core-shell-structured catalyst for low-temperature catalytic oxidation of toluene

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preparation example Construction

[0029] The present invention is used for the preparation method of the core-shell structure catalyst of low-temperature catalytic oxidation of toluene, comprises the following steps:

[0030] First, prepare a solution of chloroauric acid into a certain concentration and heat it in a water bath to a specific temperature, then add an appropriate amount of reducing agent to reduce Au 4+ After reacting for a certain period of time, the resulting solution was centrifuged, washed and dried to obtain Au NPs.

[0031] Then, Au NPs were uniformly dispersed in an appropriate amount of surfactant solution, a certain amount of copper nitrate solution was added to the above solution, and after stirring evenly, the Cu adsorbed on the surface of Au NPs was reduced in situ with a strong reducing agent. 2+ , after reacting for a certain period of time, the resulting solution is centrifuged, washed and dried to obtain the gold intermediate product Au@Cu 2 O.

[0032] Finally, the Au@Cu 2 O i...

Embodiment 1

[0035] ①First, heat the prepared 0.25mmol / L chloroauric acid solution in a water bath to 100°C, then add 7.5ml of 0.1mol / L sodium citrate solution, and stir magnetically for 30 minutes, then centrifuge, wash, and Gold nanoparticles (Au NPs) can be obtained by drying.

[0036]②Then, the obtained Au NPs were uniformly dispersed in 1 g of polyvinylpyrrolidone solution, 50 ml of 0.1 mol / L copper nitrate solution was added to the above solution, and after stirring evenly, the Cu adsorbed on the surface of Au NPs was reduced in situ with water and hydrazine solution. 2 + , after reacting for 30min, the resulting solution was centrifuged, washed and dried to obtain the intermediate product Au@Cu 2 O.

[0037] ③Au@Cu 2 O was added to the mixed solution of 20ml tert-butanol and 1ml 1.71mol / L sodium chloride after drying, and Au@Cu 2 After O is dispersed evenly, add 0.15 mol / L hydrochloric acid acidified potassium permanganate solution (0.158 mol / L) to oxidize Au@Cu in situ 2 O, th...

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Abstract

The invention discloses a preparation method of a core-shell-structured catalyst for low-temperature catalytic oxidation of toluene, and relates to a preparation method of a catalyst. The preparationmethod comprises the following steps: preparing chloroauric acid into a solution and carrying out water-bath heating on the solution, and adding a reducing agent to reduce Au4+ to obtain gold nanoparticles (Au NPs); uniformly dispersing obtained Au NPs in a surfactant, adding a copper nitrate solution, and reducing Cu2+ adsorbed on the surface of Au NPs in situ by using a strong reducing agent toobtain an intermediate product Au@Cu2O core-shell structure; and drying Au@Cu2O, adding dried Au@Cu2O into a mixed solution of tert-butyl alcohol and sodium chloride, adding an acidified potassium permanganate solution, and oxidizing and etching Cu2O to obtain the Au@MnO2 catalyst. The low-temperature catalytic activity is excellent, and the optimal temperature for completely oxidizing and removing the toluene by the catalyst is about 230 DEG C. The preparation method is simple and efficient, suitable for industrial production and outstanding in practical value. The catalyst can be used for high-efficiency oxidation removal of volatile organic compounds (VOCs).

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a catalyst with a core-shell structure for low-temperature catalytic oxidation of toluene. Background technique [0002] In recent years, my country's industry and economy have developed rapidly, and the ensuing environmental pollution has become increasingly serious, among which the most prominent problem is air pollution. Volatile organic compounds (VOCs) are not only highly toxic in themselves, but also one of the important precursors that cause combined pollution of atmospheric haze, PM2.5 and ozone. Among many VOCs, benzene-based VOCs are Irritant, highly teratogenic and carcinogenic are particularly prominent threats to human health, and are pollutants that need to be strictly controlled in industrial production. Therefore, the efficient purification and removal technology of benzene-based VOCs has important theoretical and practical significance ...

Claims

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Application Information

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Patent Type & Authority Applications(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