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Catalyst for synthesizing benzaldehyde by catalytic oxidation of toluene and preparation method thereof

A catalytic oxidation and catalyst technology, applied in catalyst activation/preparation, preparation of organic compounds, preparation of carbon-based compounds, etc., can solve the problems of limited application and inability to greatly increase the specific surface area, and achieve inhibition of agglomeration and efficient selective catalytic oxidation. performance, scaling the effect of efficient means

Active Publication Date: 2021-01-29
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there is no template method to prepare mesoporous g-C 3 N 4 The specific surface area cannot be greatly improved, which severely limits its application in the field of selective catalytic oxidation

Method used

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  • Catalyst for synthesizing benzaldehyde by catalytic oxidation of toluene and preparation method thereof
  • Catalyst for synthesizing benzaldehyde by catalytic oxidation of toluene and preparation method thereof
  • Catalyst for synthesizing benzaldehyde by catalytic oxidation of toluene and preparation method thereof

Examples

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Embodiment 1

[0036] A kind of embodiment of the preparation method of the catalyst of catalytic oxidation toluene synthesis benzaldehyde among the present invention, comprises the steps:

[0037] Step 1: Add 8.56g of urea and 6g of melamine into a beaker at room temperature, add 50ml of deionized water, stir the suspension for 0.5h, then transfer the suspension to a 100mL PTFE-lined stainless steel autoclave , and heated in an oven at 160°C for 12 hours. After rapid cooling to room temperature, the product was collected by vacuum filtration, washed with deionized water, and then dried at 80 °C for 10 h.

[0038] Step 2: Take the precursor treated in step 1 and place it in a corundum crucible with a cover, put it into a muffle furnace, raise the temperature from room temperature to 550°C at a heating rate of 3°C / min, and calcinate at 550°C for 4h , and then rapidly cooled to room temperature to obtain ultrathin N-doped nanosheet porous graphitic carbon nitride.

[0039] Step 3: The prepar...

example 2

[0044] A kind of embodiment of the preparation method of the catalyst of catalytic oxidation toluene synthesis benzaldehyde among the present invention, comprises the steps:

[0045] Step 1: Add 8.56g of urea and 6g of melamine into a beaker at room temperature, add 50ml of deionized water, stir the suspension for 0.5h, then transfer the suspension to a 100mL PTFE-lined stainless steel autoclave , and heated in an oven at 160°C for 12 hours. After rapid cooling to room temperature, ultrasonication was performed for 1 h with an ultrasonic power of 60W. The product was collected by vacuum filtration, washed with deionized water, and dried at 80 °C for 10 hours.

[0046] Step 2: Take the precursor processed in step 1 and place it in a corundum crucible with a cover, put it into a muffle furnace, raise the temperature from room temperature to 500°C at a heating rate of 2°C / min, and calcinate at 500°C for 3h , and then rapidly cooled to room temperature to obtain ultrathin N-dope...

Embodiment 3

[0052] A kind of embodiment of the preparation method of the catalyst of catalytic oxidation toluene synthesis benzaldehyde among the present invention, comprises the steps:

[0053] Step 1: Add 8.56g of urea and 6g of melamine into a beaker at room temperature, add 50ml of deionized water, stir the suspension for 0.5h, then transfer the suspension to a 100mL PTFE-lined stainless steel autoclave , and heated in an oven at 180°C for 24 hours. After rapid cooling to room temperature, ultrasonication was performed for 2 hours with an ultrasonic power of 80W. The product was collected by vacuum filtration, washed with deionized water, and dried at 80 °C for 10 hours.

[0054] Step 2: Take the precursor processed in Step 1 and place it in a corundum crucible with a cover, put it into a muffle furnace, raise the temperature from room temperature to 500°C at a heating rate of 5°C / min, and calcinate at 500°C for 4h , and then rapidly cooled to room temperature to obtain ultrathin N-...

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Abstract

The invention discloses a preparation method of a catalyst for catalytically oxidizing toluene to synthesize benzaldehyde, which includes the following steps: (1) Dissolving melamine and urea in water, and using hydrothermal method and ultrasonic cooling to obtain a precursor; (2) High-temperature forging The precursor is burned to obtain an ultra-thin N-doped nanosheet porous graphite phase carbon nitride material; (3) the graphite phase carbon nitride obtained in step (2) is loaded with a transition metal oxide by an impregnation method to obtain the described catalyst. The ultrathin N-doped nanosheet porous graphite phase carbon nitride-supported transition metal oxide catalyst prepared by the present invention, through ultrasonic-assisted hydrothermal treatment, on the one hand inhibits the agglomeration of the nanosheets and makes the nanosheets uniformly distributed, thereby significantly increasing the On the other hand, N doping creates more nitrogen vacancies, providing more reactive sites for selective catalytic oxidation.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for catalyzing the oxidation of toluene to synthesize benzaldehyde and a preparation method thereof. Background technique [0002] The selective functionalization of aromatic hydrocarbons is an important task in the industry, however, the cleavage and oxidation of C-H bonds requires high temperature, high pressure and efficient catalysts, which is still a great challenge. Toluene is an aromatic compound that can be oxidized into benzyl alcohol, benzaldehyde and benzyl benzoate, etc. Among them, benzaldehyde is the simplest and most important product, which is widely used in food, pharmaceutical, fragrance and pesticide industries. However, benzaldehyde is readily oxidized to benzoic acid. The traditional production route of benzaldehyde is the chlorination and hydrolysis of toluene. However, this process inevitably leaves chlorine ions, which are not easy to remove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/34C07C45/36C07C47/54
CPCC07C45/36B01J27/24B01J37/343B01J35/61C07C47/54
Inventor 刘自力刘颖滢左建良王琪莹
Owner GUANGZHOU UNIVERSITY
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