Nitrogen-doped layered carbon catalyst for catalyzing the oxidation of ethylbenzene and its preparation method

A technology of nitrogen doping and layered carbon, which is applied in the direction of catalyst activation/preparation, oxidative preparation of carbonyl compounds, physical/chemical process catalysts, etc. It can solve the problems of unfriendly post-processing, skeleton collapse environment, and low natural abundance. Achieve the effects of easy scale-up production and preparation, superior catalytic performance, and low raw material cost

Active Publication Date: 2021-05-14
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problems of low natural abundance, high cost, skeleton collapse, and environmentally unfriendly post-processing of these raw materials have become the main bottlenecks that limit their wide application.
Therefore, it is urgent to find a new and efficient way to prepare nitrogen-doped porous carbon catalytic materials with high specific surface area and developed pore structure to overcome the aggregation of metal nanoparticles in current heterogeneous catalytic systems under relatively harsh reaction conditions. / Drain and deactivation issues

Method used

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  • Nitrogen-doped layered carbon catalyst for catalyzing the oxidation of ethylbenzene and its preparation method
  • Nitrogen-doped layered carbon catalyst for catalyzing the oxidation of ethylbenzene and its preparation method
  • Nitrogen-doped layered carbon catalyst for catalyzing the oxidation of ethylbenzene and its preparation method

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Effect test

Embodiment 1

[0027] The preparation method of the nitrogen-doped layered carbon catalyst used to catalyze the oxidation of ethylbenzene in this embodiment comprises the following steps:

[0028] In step 1, 0.2 g of phthalocyanine and 0.2 g of dicyandiamide were physically ground and mixed uniformly.

[0029] Step 2, placing the mixture of phthalocyanine and dicyandiamine obtained in step 1 in the middle of the quartz boat, and then placing it in the constant temperature interval of the tube furnace;

[0030] Step 3, continuously feed nitrogen into the tube furnace to purge the mixture of phthalocyanine and dicyandiamide, the nitrogen flow rate is 50mL / min, and the temperature of the tube furnace body is raised to 600 at a rate of 2°C / min. ℃ and kept for 1 hour, and then cooled to room temperature to obtain a nitrogen-doped layered carbon catalyst.

[0031] The specific surface area of ​​the nitrogen-doped layered carbon catalyst used to catalyze the oxidation of ethylbenzene in this examp...

Embodiment 2

[0033] The preparation method of the nitrogen-doped layered carbon catalyst used to catalyze the oxidation of ethylbenzene in this embodiment comprises the following steps:

[0034] In step 1, 0.2 g of phthalocyanine and 1.0 g of dicyandiamide were physically ground and mixed uniformly.

[0035] Step 2, placing the mixture of phthalocyanine and dicyandiamide obtained in step 1 in the middle of the quartz boat, and then placing it in the constant temperature interval of the tube furnace;

[0036] Step 3, continuously feed nitrogen into the tube furnace to purge the mixture of phthalocyanine and dicyandiamide, the nitrogen flow rate is 100mL / min, and the temperature of the tube furnace body is raised to 700 at a heating rate of 3°C / min ℃ and kept for 2 hours, and then cooled to room temperature to obtain a nitrogen-doped layered carbon catalyst.

[0037] The specific surface area of ​​the nitrogen-doped layered carbon catalyst used to catalyze the oxidation of ethylbenzene in t...

Embodiment 3

[0039] The preparation method of the nitrogen-doped layered carbon catalyst used to catalyze the oxidation of ethylbenzene in this embodiment comprises the following steps:

[0040] In step 1, 0.2 g of phthalocyanine and 2.0 g of dicyandiamide were physically ground and mixed uniformly.

[0041] Step 2, placing the mixture of phthalocyanine and dicyandiamide obtained in step 1 in the middle of the quartz boat, and then placing it in the constant temperature interval of the tube furnace;

[0042] Step 3, continuously feed nitrogen into the tube furnace to purge the mixture of phthalocyanine and dicyandiamide, the nitrogen flow rate is 200mL / min, and the temperature of the tube furnace body is raised to 800 at a heating rate of 5°C / min ℃ and kept for 4 hours, and then cooled to room temperature to obtain a nitrogen-doped layered carbon catalyst.

[0043] The specific surface area of ​​the nitrogen-doped layered carbon catalyst used to catalyze the oxidation of ethylbenzene in t...

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Abstract

The invention relates to a nitrogen-doped layered carbon catalyst and a preparation method for catalyzing the oxidation of ethylbenzene, which are applied in technical fields such as chemical raw material synthesis of pesticides and medicine; noble metals are hydrogenated, oxidized, and coupled in a highly polar reaction medium. During the joint reaction, the strong interaction between the metal and the solvent will cause the active components to fall off, poison or deactivate from the surface of the carrier. To solve the above problems, a nitrogen-doped layered carbon catalyst and a preparation method for catalyzing the oxidation of ethylbenzene are provided. The method includes the following steps: placing a mixture of phthalocyanine and dicyandiamide in a tube furnace, raising the temperature of the furnace body to 600-1000° C. under an atmosphere of inert gas, and maintaining the constant temperature for 1-8 hours to obtain a high temperature. Nitrogen-doped layered carbon catalysts. The multi-level porous carbon catalyst prepared by the invention has rich defect sites, nitrogen content and developed pore structure, and the cost of raw materials used is low, the synthesis path is simple, and it is easy to scale up production and preparation.

Description

technical field [0001] The invention relates to a nitrogen-doped layered carbon catalyst for catalyzing the oxidation of ethylbenzene and a preparation method thereof, and is applied in technical fields such as the synthesis of pesticides and medicines from chemical raw materials. Background technique [0002] Selective oxidation of aryl alkanes is an important organic reaction to achieve chemical upgrading and is an important raw material for the production of high-value aryl ketone derivatives. So far, various noble metal and non-noble metal-based catalysts have been reported successively on peroxide or high-pressure O 2 catalytic oxidation of aryl alkanes. However, due to the inertness of the C-H bond and the unsatisfactory oxidation reaction, the catalytic oxidation of aryl alkanes still suffers from low conversion and poor selectivity. In addition, leaching and agglomeration of metal active centers are common phenomena in traditional metal-based catalysts. It has bro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08C07C45/28C07C49/78
CPCB01J27/24B01J35/1019B01J35/1061B01J37/082B01J37/084C07C45/28C07C49/78
Inventor 张锋伟李静静张献明
Owner SHANXI UNIV
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