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Nitrogen-doped activated carbon supported noble metal catalyst and its application

A noble metal catalyst and activated carbon technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, organic chemistry, etc., can solve the problems of high preparation cost, waste gas generation, high energy consumption, etc., and achieve catalyst The effect of low consumption, reduced use cost and high metal utilization rate

Active Publication Date: 2020-02-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it is also obvious that this method has high energy consumption, low yield, high preparation cost, and the process is often accompanied by waste gas generation

Method used

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  • Nitrogen-doped activated carbon supported noble metal catalyst and its application
  • Nitrogen-doped activated carbon supported noble metal catalyst and its application
  • Nitrogen-doped activated carbon supported noble metal catalyst and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Activated carbon physical parameters and treatment: ash content is 6.0wt%, specific surface area is 500m 2 / g, 150-1000 mesh activated carbon, made of coconut shell. Each gram of the activated carbon is soaked in 5ml, 0.1mol / L hydrochloric acid, boiled for 1h, then treated with 3.5ml concentrated nitric acid (10%), stirred at 35°C for 1h, and dried for later use.

[0054] Dissolve 0.08g of dicyandiamide in 40mL of water at 75℃, add 0.56g of activated carbon to the nitrogen source solution under stirring (at this time the mass ratio of nitrogen to activated carbon is 0.1:1), ultrasonic treatment for 10min, during which the temperature is 75 ℃, keep the temperature and continue mechanical stirring for 1h. The obtained slurry was transferred to a hydrothermal kettle, filled with air and sealed under normal pressure, and heat-treated at 80°C for 2 hours. After cooling to room temperature, the nitrogen-containing activated carbon slurry was washed with a volume fraction of 50% ...

Embodiment 2

[0057] The physical parameters and treatment of the carrier activated carbon: ash content is 1.0wt%, specific surface area is 1500m 2 / g, 200-800 mesh activated carbon, made of coconut shell. Each gram of the activated carbon is soaked in 10ml, 1.0mol / L hydrochloric acid and boiled for 1h, and then treated with 15ml of concentrated nitric acid (10%), stirred at 35°C for 1h, and dried for use.

[0058] Dissolve 0.34g of dicyandiamide in 40mL of water at 95°C. Under stirring, add 0.238g of activated carbon to the nitrogen source solution. At this time, the mass ratio of nitrogen to activated carbon is 1:1. Ultrasonic treatment is performed for 50 minutes. The temperature is 75℃, keep the temperature and continue mechanical stirring for 10h. The obtained slurry was transferred to a hydrothermal kettle, filled with air and sealed under normal pressure, and heat-treated at 120°C for 10 hours. After cooling to room temperature, the nitrogen-containing activated carbon slurry was washed...

Embodiment 3

[0061] The physical parameters and treatment of the carrier activated carbon: the ash content is 3.0wt%, and the specific surface area is 1500m 2 / g, 200-800 mesh activated carbon, made of coconut shell. Each gram of the activated carbon is soaked in 10ml, 3.0mol / L hydrochloric acid, boiled for 4h, and then treated with 15ml hydrogen peroxide (15wt%), stirred at 35°C for 15h, and dried for later use.

[0062] Dissolve 0.67 g of dicyandiamide in 40 mL of water at 95°C, add 0.45 g of activated carbon to the nitrogen source solution, at this time, the mass ratio of nitrogen to activated carbon is 1:1, ultrasonic treatment for 20 minutes, the temperature is 75°C, then Raise the temperature to 95°C, keep the temperature and continue mechanical stirring for 24h. The obtained slurry was transferred to a hydrothermal kettle, filled with nitrogen and sealed under normal pressure, heat-treated at 180°C for 12 hours, cooled to room temperature, and washed with a volume fraction of 50% ethan...

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Abstract

The invention discloses a nitrogen-doped activated carbon supported noble metal catalyst and an application thereof. The catalyst is composed of a carrier and an active component; the carrier is nitrogen-doped activated carbon; the active component is one of palladium, platinum, rhodium, ruthenium and iridium; and the load of the active component is not higher than 15wt% based on the mass of the carrier. The invention provides the application of the nitrogen-doped activated carbon supported noble metal catalyst to reaction for preparing an alkyl-containing halogenated aromatic aminocompound shown as a formula (II) by carrying out catalytic hydrogenation reduction on an alkyl-containing halogenated aromatic nitrocompound shown as a formula (I) to show that the nitrogen-doped activated carbon supported noble metal catalyst has the characteristics of high hydrogenation reaction rate, high catalytic activity, high selectivity and high stability.

Description

[0001] (1) Technical field [0002] The invention relates to a nitrogen-doped activated carbon supported precious metal catalyst and its preparation method and application. This type of catalyst is suitable for the catalytic hydrogenation reduction reaction of halogenated aromatic nitro compounds, and is particularly suitable for halogenated aromatic nitro groups containing alkyl groups. The compound catalyzes the hydrogenation reduction reaction. [0003] (2) Technical background [0004] The process of reducing nitro groups to amino groups is widely used in the fields of medicine, pesticides, dyes, rubber additives and photosensitive materials. The traditional reduction method is the chemical reduction method, which mostly uses sodium sulfide or iron powder to reduce the nitro group in an acidic environment. This type of process is easy to operate, has a small risk factor and requires low equipment investment, so it has become the most commonly used method for nitro reduction. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/46B01J27/24C07C209/36C07C211/52
CPCB01J23/42B01J23/44B01J23/464B01J27/24C07C209/36C07C211/52
Inventor 卢春山齐亚妮冯振龙王梦君马磊张群峰丰枫李小年
Owner ZHEJIANG UNIV OF TECH
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