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Preparation method of special nitrogen-doped molded active carbon for catalyst carrier

A technology for forming activated carbon and catalyst carrier, which is applied in the preparation of organic compounds, preparation of amino compounds, chemical instruments and methods, etc. It can solve the problems of large specific surface area and high mechanical strength, and achieve high product yield, high mechanical strength, and economical The effect of benefit improvement

Inactive Publication Date: 2020-05-22
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention proposes a preparation method of nitrogen-doped activated carbon specially used for catalyst carriers. The purpose is to address the above-mentioned deficiencies in the prior art, using inedible woody biomass as raw material, low cost, wide sources, and activated by high-temperature gas , the obtained shaped carbon has developed pore structure, large specific surface area, high mechanical strength, and the surface contains abundant "surface defects". After loading precious metals, the catalyst has good stability, high activity, and the process is green and environmentally friendly.

Method used

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  • Preparation method of special nitrogen-doped molded active carbon for catalyst carrier
  • Preparation method of special nitrogen-doped molded active carbon for catalyst carrier
  • Preparation method of special nitrogen-doped molded active carbon for catalyst carrier

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take 50 grams of dried Chinese fir chips, put them at 600 o C reaction conditions and NH 3 React for 4 hours and cool to obtain a nitrogen-doped biochar material. These nitrogen-doped biochar materials are pulverized, sieved, added with 100 grams of phenolic resin, kneaded, and extruded into a columnar shaped carbon precursor by an extruder. These shaped carbon precursors were then heated at 120 o C dried overnight, then placed in tube furnace 600 o C carbonization for 2 hours, and finally heated up to 900 o C, activated by passing water vapor for 1 hour, and obtained nitrogen-doped shaped activated carbon. The obtained carbon material has a particle size of Ф3 mm and a nitrogen content of 2.0%. The specific surface area is 1050 cm 2 / g, the average pore size is 2 nm, and the mechanical strength is > 95%.

[0028] With the nitrogen-doped formed carbon obtained above as the catalyst carrier, K 2 PdCl 6 The solution is the precursor, according to the carrier and ...

Embodiment 2

[0030] Get 50 grams of dried fir chips, add 10 grams of melamine and mix them at 600 o The reaction was carried out under the condition of C for 2 hours, and cooled to obtain a nitrogen-doped biochar material. These nitrogen-doped biochar materials are pulverized, sieved, added with 100 grams of phenolic resin, kneaded, and extruded into a columnar shaped carbon precursor by an extruder. These shaped carbon precursors were then heated at 120 o C dried overnight, then placed in tube furnace 600 o C carbonization for 2 hours, and finally heated up to 900 o C, activated by passing water vapor for 1 hour, and obtained nitrogen-doped shaped activated carbon. The particle size of the obtained carbon material is Ф3mm, and the nitrogen content is 3.0%. The specific surface area is 900cm 2 / g, mechanical strength> 95%.

[0031] With the nitrogen-doped formed carbon obtained above as the catalyst carrier, K 2 PdCl 6 The solution is the precursor, according to the carrier and K ...

Embodiment 3

[0033] Take 50 grams of dried coconut shells as raw materials, at 800 o C reaction conditions and NH 3 React for 4 hours and cool to obtain a nitrogen-doped biochar material. These nitrogen-doped biochar materials are pulverized, sieved, added with 100 grams of phenolic resin, kneaded, and extruded into a columnar shaped carbon precursor by an extruder. These shaped carbon precursors were then heated at 120 o C dried overnight, then placed in tube furnace 600 o C carbonization for 2 hours, and finally heated up to 900 o C, activated by passing water vapor for 1 hour, and obtained nitrogen-doped shaped activated carbon. The particle size of the obtained carbon material is Ф3mm, and the nitrogen content is 1.5%. The specific surface area is 1120 cm 2 / g, the average pore size is 1.7nm, and the mechanical strength is > 95%.

[0034] Using the nitrogen-doped shaped carbon obtained above as a catalyst carrier, H 2 PtCl 6 The solution is the precursor, according to the carr...

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Abstract

The invention relates to a preparation method of special nitrogen-doped molded active carbon for a catalyst carrier, wherein the special nitrogen-doped molded active carbon is high in strength, has anitrogen content of 0.5-10%, a specific surface area of 600-1200 cm<3> / g and a low ash content, and is prepared by taking wood biomass as a starting raw material through nitrogen doping, binder addition, mixing kneading, molding, carbonization and activation. The nitrogen-doped molded active carbon has the advantages of being high in specific surface area, developed in pore structure, high in strength and the like. The supported noble metal catalyst is small in particle size and high in catalytic activity, and shows conversion rate of 100% and product yield of more than 99% in a catalytic hydrogenation reaction of 1,8-dinitronaphthalene. The special nitrogen-doped molded active carbon has the advantages of wide raw material source, environment-friendly production process and the like.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped shaped activated carbon specially used for catalyst carriers, and belongs to the technical field of shaped activated carbon preparation. Background technique [0002] Catalyst supports are important components of catalysts, among which activated carbon supports have been widely used in industry, especially noble metal hydrogenation catalysts such as Pd / C, Pt / C, and Ru / C. Due to the relatively small particle size and poor mechanical strength of the powdery activated carbon carrier, it is not easy to separate and recover after the reaction. Especially for the gas-solid phase reaction with high space velocity, the gas resistance is relatively large. Therefore, the development of high-performance shaped carrier activated carbon is a research and development hotspot. [0003] The commercially used catalyst-supported activated carbon only contains surface oxygen-containing groups and has weak in...

Claims

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Application Information

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IPC IPC(8): C01B32/336C01B32/324C01B32/318B01J27/24C07C209/36C07C211/58
CPCB01J27/24C07C209/36C01B32/318C01B32/324C01B32/336C07C211/58
Inventor 夏海岸姜忠国贺泽华曾兰杨莉
Owner NANJING FORESTRY UNIV
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