Catalyst for catalytically oxidizing methylbenzene to compound benzaldehyde and preparation method thereof

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

Active Publication Date: 2019-01-11
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 catalytically oxidizing methylbenzene to compound benzaldehyde and preparation method thereof
  • Catalyst for catalytically oxidizing methylbenzene to compound benzaldehyde and preparation method thereof
  • Catalyst for catalytically oxidizing methylbenzene to compound benzaldehyde and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] An embodiment of the preparation method of the catalyst for the catalytic oxidation of toluene to benzaldehyde in the present invention includes the following steps:

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

[0038] Step 2: Take the precursor treated in Step 1 and place it in a corundum crucible with a lid, put it in a muffle furnace, heat it up from room temperature to 550°C at a heating rate of 3°C / min, and calcinate at 550°C for 4h , And then quickly cooled to room temperature to obtain ultra-thin N-doped nanosheets and porous graphite phase carbon nitride.

[0039] Step 3: The prepared ultra-thin...

example 2

[0044] An embodiment of the preparation method of the catalyst for the catalytic oxidation of toluene to benzaldehyde in the present invention includes the following steps:

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

[0046] Step 2: Take the precursor treated in Step 1 and place it in a corundum crucible with a lid, put it in a muffle furnace, heat it up from room temperature to 500°C at a heating rate of 2°C / min, and calcinate at 500°C for 3h , And then quickly cooled to room temperature to obtain ultra-thin N-doped nanosheets an...

Embodiment 3

[0052] An embodiment of the preparation method of the catalyst for the catalytic oxidation of toluene to benzaldehyde in the present invention includes the following steps:

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

[0054] Step 2: Take the precursor treated in Step 1 and place it in a corundum crucible with a lid, put it in a muffle furnace, heat it up from room temperature to 500°C at a heating rate of 5°C / min, and calcinate at 500°C for 4h , And then quickly cooled to room temperature to obtain ultra-thin N-doped nanosheets and porous graphit...

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Abstract

The invention discloses a preparation method for a catalyst for catalytically oxidizing methylbenzene to compound benzaldehyde. The preparation method comprises the following steps: (1) dissolving melamine and urea in water and adopting a hydrothermal method and ultrasonic cooling for treating, thereby acquiring a precursor; (2) calcining the precursor under high temperature, thereby acquiring anultrathin N-doped nanosheet porous graphite phase carbon nitride material; (3) adopting a dipping method for loading a transition element oxide on the graphite phase carbon nitride material acquired in the step (2), thereby acquiring the catalyst. The transition element oxide loaded ultrathin N-doped nanosheet porous graphite phase carbon nitride catalyst prepared according to the invention is subjected to ultrasound-assisted hydro-thermal treatment, so that the agglomeration of nanosheet is restrained, the nanosheet distribution is uniform and the specific area is obviously increased, and meanwhile, more nitrogen vacant sites are generated by N doping, so that more reaction active sites are supplied for selective catalytic oxidation.

Description

Technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for catalytically oxidizing toluene to synthesize benzaldehyde and a preparation method thereof. Background technique [0002] The selective functionalization of aromatic hydrocarbons is an important task for the industry. However, the cleavage and oxidation of C-H bonds requires high temperature, high pressure and efficient catalysts, which is still a huge challenge. Toluene is an aromatic compound that can be oxidized into benzyl alcohol, benzaldehyde and benzyl benzoate. Among them, benzaldehyde is the simplest and most important product, which is widely used in the food, pharmaceutical, perfume and pesticide industries. However, benzaldehyde is easily oxidized to benzoic acid. The traditional production route of benzaldehyde is toluene chlorination hydrolysis. However, this process inevitably contains residual chloride ions, which is difficult to remove, and produce...

Claims

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Application Information

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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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