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A kind of preparation method of porous cobalt carbide

A cobalt carbide and cobalt source technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of large cobalt carbide particle size, long time consumption, and long reaction time, so as to improve the ability to absorb CO and avoid Effects of agglomeration and reduction of carbonization reaction time

Active Publication Date: 2021-09-28
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main problem to be solved by the present invention is: in the traditional precipitation calcination carbonization method, the size of the generated cobalt tetroxide and sintering agglomeration are difficult to control, resulting in the larger particle size of the cobalt carbide generated by carbonization and the longer time-consuming problem in the carbonization reaction of cobalt oxide. Provide a method for preparing porous cobalt carbide powder with smaller size and less carbonization time
At the same time, the residual activated carbon after roasting can react with the oxygen in the carbonization of cobalt trioxide to break the balance of carbonization reaction to improve the efficiency of carbonization reaction, reduce the time required for carbonization reaction, and effectively solve the problem of cobalt carbide produced by traditional precipitation method roasting carbonization method. The problem of uncontrollable product particle size and shape and too long reaction time

Method used

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  • A kind of preparation method of porous cobalt carbide
  • A kind of preparation method of porous cobalt carbide
  • A kind of preparation method of porous cobalt carbide

Examples

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Effect test

Embodiment 1

[0034] Weigh 100g of coconut shell activated carbon, pour 200mL of nitric acid solution with a mass fraction of 30%, mechanically stir for 3 hours and then let it stand for 21 hours. After standing, wash the activated carbon repeatedly with deionized water until the pH value of the washing solution is detected to be 7. . The activated carbon after cleaning was put into an oven and dried at 120° C. for 12 hours to obtain pretreated activated carbon, which was set aside. Dissolve 3.58g of cobalt nitrate in 25mL of deionized water to form the first solution, and dissolve 1.42g of ammonium carbonate in 5mL of deionized water to form the second solution. The temperature of the first solution and the second solution is kept at 35°C. Select 10g of activated carbon that has been treated, and impregnate the first solution and the second solution on the activated carbon for several times: take 7mL of the first solution and impregnate it into the activated carbon, let it stand for 30 min...

Embodiment 2

[0036] Weigh 100g of coconut shell activated carbon, pour 200mL of nitric acid solution with a mass fraction of 30%, mechanically stir for 3 hours and then let it stand for 21 hours. After standing, wash the activated carbon repeatedly with deionized water until the pH value of the washing solution is detected to be 7. . The activated carbon after cleaning was put into an oven and dried at 120° C. for 12 hours to obtain pretreated activated carbon, which was set aside. Dissolve 3.58g of cobalt nitrate in 13mL of deionized water to form the first solution, and dissolve 1.42g of ammonium carbonate in 11.5mL of deionized water to form the second solution. The temperature of the first solution and the second solution is kept at 35°C. Select 10g of activated carbon that has been treated, and impregnate the first solution and the second solution on the activated carbon for several times: take 7mL of the first solution and impregnate it into the activated carbon, let it stand for 30 ...

Embodiment 3

[0038] Weigh 100g of coconut shell activated carbon, pour 200mL of nitric acid solution with a mass fraction of 30%, mechanically stir for 3 hours and then let it stand for 21 hours. After standing, wash the activated carbon repeatedly with deionized water until the pH value of the washing solution is detected to be 7. . The activated carbon after cleaning was put into an oven and dried at 120° C. for 12 hours to obtain pretreated activated carbon, which was set aside. Dissolve 7.16g of cobalt nitrate in 25mL of deionized water to form the first solution, and dissolve 2.84g of ammonium carbonate in 5mL of deionized water to form the second solution. The temperature of the first solution and the second solution is kept at 35°C. Select 10g of activated carbon that has been treated, and impregnate the first solution and the second solution on the activated carbon for several times: take 7mL of the first solution and impregnate it into the activated carbon, let it stand for 30 min...

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Abstract

The invention discloses a preparation method of porous cobalt carbide, which belongs to the technical field of inorganic chemical industry. The invention adopts nitric acid-modified activated carbon carrier to uniformly impregnate cobalt salt and precipitant, roasts in a muffle furnace at a temperature of 300-900 DEG C, and then introduces reducing gas to obtain porous cobalt carbide. The present invention uses activated carbon with abundant voids as a hard template carrier, and conducts precipitation reaction in the pores of the activated carbon by impregnating cobalt salts and precipitating agents to form ultrafine precipitated particles, preventing particle growth, and controlling particle size and shape. At the same time, the residual activated carbon after roasting can react with the oxygen in the carbonization of cobalt tetroxide to break the balance of the carbonization reaction to improve the efficiency of the carbonization reaction and reduce the time required for the carbonization reaction.

Description

technical field [0001] The invention relates to a preparation method of cobalt carbide, in particular to a preparation method of porous cobalt carbide powder, and belongs to the technical field of inorganic chemical industry. Background technique [0002] Cobalt-based catalyst is an important catalyst for Fischer-Tropsch synthesis reaction. In the Fischer-Tropsch synthesis reaction, metallic cobalt is easily carbonized to form Co 2 c. For a long time people have tended to think that Co 2 C has no Fischer-Tropsch synthesis reactivity and severely hinders the reaction. However, recent research results have shown that Co 2 C plays an extremely important role in some Fischer-Tropsch synthesis reactions. Ding Yunjie et al. believe that in Fischer-Tropsch synthesis reactions CO is in the Co-Co 2 The C interface can easily insert hydrocarbon chains to generate alcohols (ACS Catalysis 5(6): 3620-3624); and Zhong Liangshu and Sun Yuhan et al. found that cobalt carbide nanoprisms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22B01J35/10C01B32/914
CPCB01J27/22B01J35/10C01B32/914
Inventor 倪军吴敬松张天釜林建新林炳裕王秀云
Owner FUZHOU UNIV
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