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High-performance palladium-carbon catalyst and preparation method thereof

A palladium-carbon catalyst, high-performance technology, applied in the preparation of amino compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problem of low dispersity of the palladium-carbon catalyst, and achieve the promotion of modification, improved dispersibility, and prevention of the effect of reunion

Active Publication Date: 2021-04-20
浙江工业大学上虞研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art, the present invention provides a high-performance palladium-carbon catalyst, which solves the problem of low dispersion of the palladium-carbon catalyst, utilizes the modification of porous activated carbon to form amino traction on the surface, and contributes to the palladium ion Solidification prevents the agglomeration of palladium ions, thereby improving the dispersion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A high-performance palladium-carbon catalyst, which uses a porous activated carbon structure and palladium particles as the catalytic activity to form a porous palladium-carbon catalyst.

[0021] The preparation method of described high performance palladium carbon catalyst, comprises the steps:

[0022] Step 1, add activated carbon to 1L of distilled water and stir evenly to form a suspension, then add methyl cellulose and sodium chloride to ultrasonic at low temperature to completely disperse, stir at constant temperature and stand to form a gel, the concentration of the activated carbon in water is 80g / L, the stirring speed of stirring is 2000r / min; The add-on of described methylcellulose is 30% of the mass of activated carbon, the add-on of sodium chloride is 60% of the mass of activated carbon, and the temperature of low-temperature ultrasonic is 6 ℃ , the ultrasonic frequency is 80kHz, the temperature of constant temperature stirring is 100°C, and the stirring spe...

Embodiment 2

[0029] A high-performance palladium-carbon catalyst, which uses a porous activated carbon structure and palladium particles as the catalytic activity to form a porous palladium-carbon catalyst.

[0030] The preparation method of described high performance palladium carbon catalyst, comprises the steps:

[0031] Step 1, add activated carbon to 1L of distilled water and stir evenly to form a suspension, then add methyl cellulose and sodium chloride to ultrasonic at low temperature to completely disperse, stir at constant temperature and stand to form a gel, the concentration of the activated carbon in water is 30g / L, the stirring speed of stirring is 1000r / min; The addition of described methyl cellulose is 20% of the quality of activated carbon, the addition of sodium chloride is 40% of the quality of activated carbon, and the temperature of low-temperature ultrasonic is 2 ℃ , the ultrasonic frequency is 60kHz, the temperature of constant temperature stirring is 80°C, and the st...

Embodiment 3

[0038] A high-performance palladium-carbon catalyst, which uses a porous activated carbon structure and palladium particles as the catalytic activity to form a porous palladium-carbon catalyst.

[0039] The preparation method of described high performance palladium carbon catalyst, comprises the steps:

[0040] Step 1, add activated carbon to 1L of distilled water and stir evenly to form a suspension, then add methyl cellulose and sodium chloride to ultrasonic at low temperature to completely disperse, stir at constant temperature and stand to form a gel, the concentration of the activated carbon in water is 60g / L, the stirring speed of stirring is 1500r / min; The add-on of described methylcellulose is 25% of the mass of activated carbon, the add-on of sodium chloride is 50% of the mass of activated carbon, and the temperature of low-temperature ultrasonic is 4 ℃ , the ultrasonic frequency is 70kHz, the temperature of constant temperature stirring is 90°C, and the stirring spee...

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Abstract

The invention belongs to the field of nitroaniline synthesis, particularly relates to a high-performance palladium-carbon catalyst and a preparation method thereof, and provides a porous palladium-carbon catalyst formed by taking a porous activated carbon structure body and palladium particles as catalytic activity and a preparation method thereof. According to the preparation method, the problem of low dispersity of the palladium-carbon catalyst is solved, amino traction is formed on the surface by utilizing modification of the porous activated carbon, solidification of palladium ions is facilitated, agglomeration of the palladium ions is prevented, and thus the dispersity is improved.

Description

technical field [0001] The invention belongs to the field of nitroaniline synthesis, and in particular relates to a high-performance palladium-carbon catalyst and a preparation method thereof. Background technique [0002] Nitroaniline, including o-nitroaniline, m-nitroaniline and p-nitroaniline, is a class of artificially synthesized chemical substances widely used in the fuel dye industry. It is mainly used as an intermediate for dye synthesis and pharmaceutical chemicals. [0003] The industry usually uses nitrochlorobenzene ammonolysis method to directly prepare nitroaniline by ammonolysis of nitrochlorobenzene under high pressure. The process for preparing nitroaniline has high selectivity and high product purity, but the process has low production efficiency and produces a large amount of chlorine-containing wastewater, which is not friendly to the environment. With the continuous development of catalytic hydrogenation reduction technology, more and more catalytic hyd...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J35/02B01J35/10B01J27/24C07C209/36C07C211/52
Inventor 方标许萌柯军梁
Owner 浙江工业大学上虞研究院有限公司