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Copper-loading catalyst capable of oxidizing the benzene to phenol using hydrogen peroxide as oxidant, preparation method and use thereof

A hydrogen peroxide and copper catalyst technology, which is applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, and the preparation of organic compounds, can solve the problems of deep oxidation of phenol and achieve high dispersion, simple operation, and high atom economy Effect

Inactive Publication Date: 2009-02-11
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the higher activity of phenol than benzene, phenol is prone to deep oxidation, and further reacts to produce by-products such as quinone, quinone, and tar.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Catalyzing hydrogen peroxide oxidation of benzene to phenol-supported copper catalyst, especially catalytic hydrogen peroxide direct oxidation of benzene to phenol-supported copper catalyst, the catalyst is based on SBA-16 mesoporous molecular sieve, loaded transition metal copper, copper content as the carrier 4-10% of the mass.

[0020] The preparation method of the catalyzed hydrogen peroxide oxidation of benzene to the phenol-supported copper catalyst, especially the preparation method of the catalyzed hydrogen peroxide direct oxidation of benzene to the phenol-supported copper catalyst, accurately weighs the copper source compound, dissolves it in water, and adds SBA- 16 mesoporous molecular sieves, then adjust the pH value of the solution to 6.0-9.0 with ammonia water, stir overnight at room temperature, filter, wash the precipitate with deionized water, dry at 100°C, and roast at 350-550°C for 2-6 hours to obtain Cu / SBA-16 catalyst.

[0021] The preparation meth...

Embodiment 2

[0024] Accurately weigh a certain amount of copper nitrate, dissolve it in water, add SBA-16 mesoporous molecular sieve, adjust the pH value of the solution to 7.5 with ammonia water, stir at room temperature overnight, filter, wash the precipitate with deionized water, dry at 100°C, and roast at 550°C 4 hours produced a catalyst with a copper content of 5%. Using this as a catalyst, the oxidation reaction of benzene takes 30% hydrogen peroxide as an oxidant in a reactor equipped with a constant temperature reflux and stirring device. The mass ratio of benzene to hydrogen peroxide is 1:3.5, and the solvent is Acetonitrile, the volume ratio of solvent to benzene is 50:3, the mass ratio of the amount of catalyst to the amount of benzene is 1:2.6, the reaction temperature is 70°C, the reaction time is 24 hours, cool, filter, collect the liquid, and measure the yield of phenol is 6.6%, and the selectivity of phenol is 99.5%.

Embodiment 3

[0026] Accurately weigh a certain amount of copper nitrate, dissolve it in water, add SBA-16 mesoporous molecular sieve, adjust the pH value of the solution to 7.0 with ammonia water, stir overnight at room temperature, filter, wash the precipitate with deionized water, dry at 100°C, and roast at 550°C 4 hours produced a catalyst with a copper content of 5%. Using this as a catalyst, the oxidation reaction of benzene takes 30% hydrogen peroxide as an oxidant in a reactor equipped with a constant temperature reflux and stirring device. The mass ratio of benzene to hydrogen peroxide is 1:3.5, and the solvent is Acetonitrile, the volume ratio of solvent to benzene is 50:3, the mass ratio of the amount of catalyst to the amount of benzene is 1:2.6, the reaction temperature is 70°C, the reaction time is 24 hours, cool, filter, collect the liquid, and measure the yield of phenol is 6.8%, and the selectivity of phenol is 99.6%.

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Abstract

The invention relates to a copper-carried catalyst used for catalyzing hydrogen peroxide or oxidizing benzene to phenol, the preparation and the application thereof. Phenol is an important chemical raw material and also a precursor for preparing Bisphenol A, carbonic ester, phenolic resin, polycaprolactam, detergents, fungicides, herbicides, dyes, adhesives, antioxidants and a plurality of other compounds. Industrially, the demand of the phenol is great, and the world demand exceeds 6.6 multiplied by 10<7> tons per year and increases at the speed of 7 percent to 10 percent annually. A plurality of synthetic routes of the phenol are developed to meet the increasing demand of the phenol. The catalyst takes SBA-16 meso-porous molecular sieve as a carrier and carries transition metal copper, the content of which is 4 percent to 10 percent of the weight of the carrier. The catalyst is applied in the chemical field, namely, oxidizing benzene to phenol directly.

Description

Technical field: [0001] The invention relates to a copper catalyst for direct oxidation of benzene to phenol by catalytic hydrogen peroxide, preparation and application of the catalyst. Background technique: [0002] Phenol is an important chemical raw material. It is the precursor of bisphenol A, carbonate, phenolic resin, nylon-6, detergent, fungicide, herbicide, dye, adhesive, antioxidant and many other compounds. The demand for phenol is very large, and the world demand has exceeded 6.6×10 7 tons / year, and grow at a rate of 7%-10% every year. In order to meet the increasing demand for phenol, many synthetic routes of phenol have been developed. [0003] In recent years, new progress has been made in the research on the synthetic route of phenol. According to the reaction process, the synthesis methods of phenol can be generally divided into two categories: multi-step synthesis method and one-step synthesis method. The multi-step synthesis methods mainly include cumen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/72C07C39/04C07C37/58
CPCY02P20/52
Inventor 朱宇君董永利袁福龙付宏刚
Owner HEILONGJIANG UNIV
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