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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 problem of difficulty in controlling the size of cobalt tetroxide and sintering agglomeration, uncontrollable particle size and morphology of cobalt carbide products, and large cobalt carbide particle size To achieve the effect of improving the carbonization reaction efficiency, solving the uncontrollable particle size and shape, and avoiding agglomeration

Active Publication Date: 2019-04-26
FUZHOU UNIV
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  • Abstract
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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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  • Preparation method of porous cobalt carbide
  • Preparation method of porous cobalt carbide
  • Preparation method of porous cobalt carbide

Examples

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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 maintained 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 ...

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, and belongs to the technical field of inorganic chemical engineering. A nitric acid modified activated carbon carrier is evenly impregnated with cobalt salt and a precipitator, and is roasted in a muffle furnace at the temperature of 300-900 DEG C, and then a reducing gas is introduced to obtain the porous cobalt carbide. The rich-pore activated carbon is used as a hard template carrier, the cobalt salt and the precipitator are impregnated in pores of the activated carbon to precipitate and react to form an ultrafine precipitation particle, and the particle is prevented from growing so as to control the particle size and the morphology. Moreover, the activated carbon left after the roasting reacts with the oxygen produced in the carbonizing of cobaltosic oxide, so that the balance of the carbonation reaction is broken, the efficiency of the carbonation reaction is improved, and a large quantity of time required forthe carbonation reaction is shortened.

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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IPC IPC(8): B01J27/22B01J35/10C01B32/914
CPCC01B32/914B01J27/22B01J35/60
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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