Porous carbon-loaded composite material catalyst as well as preparation method and application thereof

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 that are not conducive to reducing the use cost of the precious metal catalyst, the metal utilization rate is decreased, etc., and achieves a significant dechlorination inhibition effect. The effect of reducing the difficulty of recycling

Active Publication Date: 2017-05-31
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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  • Porous carbon-loaded composite material catalyst as well as preparation method and application thereof
  • Porous carbon-loaded composite material catalyst as well as preparation method and application thereof
  • Porous carbon-loaded composite material catalyst as well as preparation method and application thereof

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-loaded composite material catalyst as well as a preparation method and application thereof. The catalyst consists of a carrier, an active component and a carbon quantum dot, wherein the active component and the carbon quantum dot are loaded on the carrier; the size of the carbon quantum dot is not more than 10 nm; the carrier is porous activated carbon; the active component is one of or a combination of several of platinum, palladium, iridium, ruthenium and rhodium; based on the mass of the carrier, the loading quantity of various metals in the active component is shown as follows: the platinum is 0-10.0 percent by weight, the palladium is 0-10.0 percent by weight, the iridium is 0-10.0 percent by weight, the ruthenium is 0-10.0 percent by weight, and the rhodium is 0-5.0 percent by weight; the loading quantity of the platinum, the rhodium and the palladium is not 0; the total loading quantity of the active component is more than 0.5 percent by weight and is not more than 20 percent by weight; based on the mass of the carrier, the loading quantity of the carbon quantum dot is not more than 15.0 percent by weight. The invention further provides application of the porous carbon-loaded composite material catalyst to the reaction of synthesis of chloroaniline by selective catalytic hydrogenation of chloro-nitrobenzene. The catalyst has the characteristics of being high in conversion rate, high in catalytic activity and high in stability.

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 Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/46B01J35/10C07C209/36C07C211/52
CPCB01J23/42B01J23/44B01J23/462B01J23/464B01J23/468B01J35/1028B01J35/1042C07C209/36C07C211/52
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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