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A kind of porous carbon-supported composite material catalyst and its preparation method and application

A composite material and catalyst technology, which is applied to the porous carbon-supported composite material catalyst and the field of preparation and application thereof, can solve the problems of unfavorable reduction of the use cost of the precious metal catalyst, decrease of metal utilization rate, etc., and achieves remarkable dechlorination inhibition effect and repeated application times The effect of reducing the cost of use

Active Publication Date: 2019-07-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of metal particles means the decline of metal utilization, which is not conducive to reducing the cost of noble metal catalysts.

Method used

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  • A kind of porous carbon-supported composite material catalyst and its preparation method and application
  • A kind of porous carbon-supported composite material catalyst and its preparation method and application
  • A kind of porous carbon-supported composite material catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The physical parameters of the carrier activated carbon: the specific surface area is 1500m 2 / g, the proportion of micropore specific surface area is 75%, the ash content is 3.0wt%, and the pore volume is 0.5mL / g; the material of activated carbon is coconut shell.

[0042] Measure 5mL of ethylene glycol and 80mL of 0.1g / mL alanine solution, stir evenly, then transfer to a hydrothermal reactor and keep at 150°C for 24h, then transfer the reaction solution to a dialysis bag with a molecular weight cut-off of 1000 Carry out dialysis for 12 hours; then freeze-dry the dialysate at a relative vacuum degree of <-0.085MPa and a temperature of -10°C for 10 hours to obtain solid powder of quantum dots.

[0043] Then weigh 5g of activated carbon, put it in 50mL of 6mol / L hydrochloric acid solution for impurity removal and pore expansion treatment for 6h, the treatment temperature is 30°C, then filter and wash until neutral, then add 15mL of water to mix and stir, and drop Add hy...

Embodiment 2

[0046] The physical parameters of the carrier activated carbon: the specific surface area is 1800m 2 / g, the ratio of the micropore specific surface area is 75%, the ash content is 3.0wt%, and the pore volume is 0.5mL / g; the material of the activated carbon is coconut shell.

[0047] Measure 5mL of ethylene glycol and 160mL of 0.05g / mL alanine solution, stir evenly, then transfer to a hydrothermal reactor and keep at 250°C for 3h, then transfer the reaction solution to a dialysis bag with a molecular weight cut-off of 5000 Carry out dialysis for 12 hours; then freeze-dry the dialysate at a relative vacuum degree of <-0.085MPa and a temperature of -10°C for 10 hours to obtain solid powder of quantum dots.

[0048] Then weigh 5g of activated carbon, place it in 30mL of 9mol / L hydrochloric acid solution for 8 hours of impurity removal and pore expansion treatment, the treatment temperature is 40°C, then filter and wash until neutral, then add 25mL of water to mix and stir, and dr...

Embodiment 3

[0051] The physical parameters of the carrier activated carbon: the specific surface area is 1700m 2 / g, the ratio of the micropore specific surface area is 85%, the ash content is 3.0wt%, and the pore volume is 0.65mL / g; the material of the activated carbon is coconut shell.

[0052] Measure 5mL of ethylene glycol and 180mL of 0.165g / mL alanine solution, stir evenly, then transfer to a hydrothermal reactor and keep at 180°C for 6h, then transfer the reaction solution to a dialysis bag with a molecular weight cut-off of 5000 Carry out dialysis for 14 hours; then freeze-dry the dialysate at a relative vacuum degree of <-0.085 MPa and a temperature of -5°C for 12 hours to obtain solid powder of quantum dots.

[0053] Then weigh 5g of activated carbon, place it in 100mL of 8mol / L hydrochloric acid solution for 8 hours of impurity removal and pore expansion treatment, the treatment temperature is 60°C, then filter and wash until neutral, then add 30mL of water to mix and stir, and...

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Abstract

The invention discloses a porous carbon-supported composite material catalyst and its preparation method and application. The catalyst is composed of a carrier, active components loaded on the carrier, and carbon quantum dots with a size of no more than 10 nm. The carrier It is porous activated carbon, and the active component is one or a combination of platinum, palladium, iridium, ruthenium, and rhodium; based on the quality of the carrier, the loading amount of each metal in the active component is: palladium 0wt %~10.0wt%, platinum 0wt%~10.0wt%, iridium 0wt%~10.0wt%, ruthenium 0wt%~10.0wt%, rhodium 0wt%~5.0wt%, and the loading amounts of palladium, platinum and rhodium are not all 0. The total loading amount of active components is greater than 0.5% and not higher than 20%; based on the mass of the carrier, the loading amount of the carbon quantum dots is not higher than 15.0wt%. The invention also provides the application of the porous carbon-supported composite material catalyst in the reaction of selective catalytic hydrogenation of chlorinated nitrobenzene to synthesize chloroaniline. The catalyst exhibits high conversion rate, high catalytic activity and high stability. specialty.

Description

[0001] (1) Technical field [0002] The invention relates to a porous carbon-supported composite material catalyst and a preparation method and application thereof. The catalyst can be used in catalytic hydrogenation reduction reaction of chloronitrobenzene. [0003] (2) Technical background [0004] The reduction of chloronitrobenzene to chloroaniline is an important basic organic synthesis reaction, which is widely used in the synthesis of fine chemicals such as medicine, pesticides, dyes, pigments, rubber additives, and photosensitive materials. At present, the catalytic hydrogenation method has been widely used in the reduction process of chloronitrobenzene because of its environmental friendliness, stable product quality and advanced technology. However, there will be side reactions of dechlorination and hydrogenolysis in this method, which will produce organic by-products and hydrochloric acid (hydrogen chloride is soluble in water), which will have a serious impact on ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/46B01J35/10C07C209/36C07C211/52
CPCC07C209/36B01J23/42B01J23/44B01J23/462B01J23/464B01J23/468B01J35/618B01J35/635C07C211/52
Inventor 卢春山冯振龙齐亚妮王梦君丰枫马磊张群峰李小年
Owner ZHEJIANG UNIV OF TECH
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