Modified active carbon, and preparation method and application thereof

A technology of activated carbon and modification, which is applied in chemical instruments and methods, preparation/separation of ammonia, inorganic chemistry, etc. It can solve the problems that the stability needs to be further improved, and achieve the improvement of anti-methanation ability, high mesopority, and pore size. distribution concentration effect

Active Publication Date: 2017-02-01
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ruthenium-based ammonia synthesis catalyst prepared by these methods needs further improvement in its activity and stability

Method used

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  • Modified active carbon, and preparation method and application thereof
  • Modified active carbon, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of modified activated carbon, the concrete steps are:

[0021] (1) Pretreatment of activated carbon: 5 g of commercial activated carbon was graphitized at 1900 °C for 10 hours in an argon inert atmosphere, and then subjected to pore expansion treatment at 450 °C for 30 hours in an oxygen atmosphere to obtain pretreated activated carbon, washed, dry and ready for use;

[0022] (2) Modification of graphitized activated carbon: The activated carbon pretreated in step (1) was crushed and screened to obtain 12-16 mesh activated carbon particles, soaked in a nitric acid solution with a concentration of 5 wt% at 70 °C, and kept at a constant temperature for 2 h, take it out, wash it with distilled water until neutral, and dry it in an oven at 110 °C for 12 h; then place the dried sample in an ammonia atmosphere at 1100 °C for heat treatment for 2 h, with a gas flow rate of 75ml / min, and drop it to room temperature in the atmosphere Take it out to get the ...

Embodiment 2

[0024] A preparation method of modified activated carbon, the concrete steps are:

[0025] (1) Pretreatment of activated carbon: 5 g of commercial activated carbon was graphitized at 2000 °C for 2 hours in an inert argon atmosphere, and then subjected to pore expansion treatment at 450 °C for 30 hours in an oxygen atmosphere to obtain pretreated activated carbon, washed, dry and ready for use;

[0026] (2) Modification of graphitized activated carbon: The activated carbon pretreated in step (1) was crushed and screened to obtain 12-16 mesh activated carbon particles, soaked in a nitric acid solution with a concentration of 10 wt% at 60 °C, and kept at a constant temperature for 3 h, take it out, wash it with distilled water until neutral, and dry it in an oven at 90 °C for 16 h; then place the dried sample in an ammonia atmosphere at 1100 °C for 2 h, with a gas flow rate of 100 ml / min, and take it out when the atmosphere drops to room temperature , the modified activated carb...

Embodiment 3

[0028] A preparation method of modified activated carbon, the concrete steps are:

[0029] (1) 5 g of commercial activated carbon was graphitized at 1800 °C for 5 hours in an argon inert atmosphere, and then subjected to pore expansion treatment at 460 °C for 20 hours in an oxygen atmosphere to obtain pretreated activated carbon, which was washed and dried for later use;

[0030] (2) Modification of graphitized activated carbon: The activated carbon pretreated in step (1) was crushed and screened to obtain 12-16 mesh activated carbon particles, soaked in a nitric acid solution with a concentration of 7 wt% at 75 °C, and kept at a constant temperature for 1 h, take it out, wash it with distilled water until neutral, and dry it in an oven at 100 °C for 14 h; then place the dried sample in an ammonia atmosphere at 900 °C for heat treatment for 2 h, with a gas flow rate of 50ml / min, and drop it to room temperature in the atmosphere Take it out to get the modified activated carbon ...

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Abstract

The invention provides modified active carbon, and a preparation method and application thereof, belonging to the field of preparation of catalyst carriers. The preparation method comprises the following steps: subjecting graphitized active carbon to treatment with HNO3 and then carrying out high-heat treatment in an ammonia gas atmosphere so as to obtain an active carbon carrier with high mesoporosity. The carrier has the characteristics of a great pore volume, high mesoporosity (no less than 97%), good conductivity, etc. When used as a carrier for an ammonia-synthesis catalyst, the carrier can substantially improve the dispersity of the precious metal ruthenium and improves anti-methanation capability, heat stability and activity of the catalyst. The carrier has wide application prospect in the field of catalysis.

Description

technical field [0001] The invention belongs to the field of catalyst carrier preparation, and in particular relates to a modified activated carbon, a preparation method and an application thereof. Background technique [0002] For various agricultural products, fertilizers are extremely important to their growth and increase in yield. To synthesize various fertilizers suitable for crops, the development of the synthetic ammonia industry has played a huge role. Among them, the invention of synthetic ammonia ferric catalyst has created a catalytic ammonia synthesis industry, and the iron catalyst is cheap and stable, and has become one of the most thorough and successful catalysts in the world. However, when iron catalysts are used, the ammonia synthesis reaction must be carried out under high temperature and high pressure conditions, which consumes a lot of energy and requires more stringent equipment. [0003] The emergence of ruthenium catalysts makes it possible to carry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J23/58C01C1/04
CPCY02P20/52B01J21/18B01J23/58B01J35/1023B01J35/1042B01J35/1047B01J35/1061C01C1/0411
Inventor 倪军罗小芳林建新江莉龙林炳裕
Owner FUZHOU UNIV
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