Columnar activated carbon, preparation method thereof as well as carrier of ruthenium-based ammonia synthesis catalyst

Abstract

The invention provides a columnar activated carbon, a preparation method thereof as well as a carrier of a ruthenium-based ammonia synthesis catalyst, wherein the columnar activated carbon is prepared from the raw material of a coconut shell, has the average pore diameter of 2-6nm, has the pore volume of 0.6-1.0cm<3> / g, and has the intensity of 140-210N / cm. The method comprises the following steps: kneading a mixed aqueous solution comprising coconut shell powder, a bonding agent, a pore-enlarging agent and an activating agent so as to obtain a kneaded material; molding the kneaded material to obtain a columnar material, and putting the columnar material into an atmosphere furnace, carbonizing and activating so as to obtain the columnar activated carbon. Mesopores of the columnar activated carbon provided by the invention are distributed centrally and have relatively high intensity, so that the application prospect of the columnar activated carbon is expanded further. The method provided by the invention also has the advantages of simple technology and high product yield (the yield is 30%-40%).

Description

technical field

[0001] The invention relates to the technical field of activated carbon, in particular to a columnar activated carbon, a preparation method thereof and a carrier of a ruthenium-based ammonia synthesis catalyst. Background technique

[0002] As an important porous functional material, activated carbon has been widely used in environmental protection, air purification, decolorization and deodorization, solvent recovery, catalyst carrier and other fields. For activated carbon, the pore size and quantity of the pore structure directly affect its use and adsorption effect. Therefore, it is very important to regulate the pore structure reasonably.

[0003] At present, common pore structure regulation techniques can be divided into: activation process control method, heat treatment method, template method, chemical vapor deposition method and additive method. In terms of application, the activation process control method and the additive method have more advantage...

Examples

Embodiment 1-1

[0039] The clean coconut shell is dried and crushed, crossed a 100 mesh sieve, then gets 50g of coconut shell powder, adds 1.5g of field greens powder, mixes evenly, adds mixed solution (44g mass fraction is the phosphoric acid of 85%, 2.5gKH 2 PO 4 , 15g water), placed in a kneader and kneaded for 40min;

[0040]Then take it out and dry it in a vacuum drying oven at 40°C for 20 minutes, then extrude and shape it. The molding material is placed in a drying oven at 120°C for pre-curing for 3 hours, and then the material is placed in an atmosphere furnace for carbonization and activation. The process parameters are: argon Atmosphere, the flow rate is controlled at 100ml / min, the heating rate is 5°C / min, the final temperature is set at 800°C, and maintained for 1h;

[0041] When the temperature drops to room temperature, take it out, rinse it with water until the pH value is 6, and dry it.

Embodiment 1-2

[0043] The clean coconut shell is dried and broken, crossed 100 mesh sieve, then get 50g coconut shell powder, add 1.5g scallop powder, mix well, add mixed solution (44g mass fraction is phosphoric acid of 85%, 2.5gK 2 HPO 4 , 15g water), placed in a kneader and kneaded for 30min;

[0044] Then take it out and dry it in a vacuum drying oven at 50°C for 30 minutes, then extrude and shape it. The molding material is placed in a drying oven at 110°C for pre-curing for 3 hours, and then the material is placed in an atmosphere furnace for carbonization and activation, in an argon atmosphere, and the flow rate is controlled as 100ml / min, the heating rate is 5°C / min, the final temperature is set at 800°C, and maintained for 1h;

[0045] When the temperature drops to room temperature, take it out, rinse it with water until the pH value is 6, and dry it.

Embodiment 1-3

[0047] The clean coconut shell is dried and broken, crossed a 100-mesh sieve, then gets 50g of coconut shell powder, adds 1.5g of field turnip powder, mixes evenly, adds mixed solution (44g mass fraction is phosphoric acid of 85%, 2.5gKNO 3 , 15g water), placed in a kneader and kneaded for 40min;

[0048] Then take it out and dry it in a vacuum drying oven at 40°C for 20 minutes, then extrude and shape it. The molding material is placed in a drying oven at 120°C for pre-curing for 3 hours, and then the material is placed in an atmosphere furnace for carbonization and activation. The process parameters are: argon Atmosphere, the flow rate is controlled at 100ml / min, the heating rate is 5°C / min, the final temperature is set at 800°C, and maintained for 1h;

[0049] When the temperature drops to room temperature, take it out, rinse it with water until the pH value is 6, and dry it.

technical field

[0001] The invention relates to the technical field of activated carbon, in particular to a columnar activated carbon, a preparation method thereof and a carrier of a ruthenium-based ammonia synthesis catalyst. Background technique

[0002] As an important porous functional material, activated carbon has been widely used in environmental protection, air purification, decolorization and deodorization, solvent recovery, catalyst carrier and other fields. For activated carbon, the pore size and quantity of the pore structure directly affect its use and adsorption effect. Therefore, it is very important to regulate the pore structure reasonably.

[0003] At present, common pore structure regulation techniques can be divided into: activation process control method, heat treatment method, template method, chemical vapor deposition method and additive method. In terms of application, the activation process control method and the additive method have more advantage...

Examples

Embodiment 1-1

[0039] The clean coconut shell is dried and crushed, crossed a 100 mesh sieve, then gets 50g of coconut shell powder, adds 1.5g of field greens powder, mixes evenly, adds mixed solution (44g mass fraction is the phosphoric acid of 85%, 2.5gKH 2 PO 4 , 15g water), placed in a kneader and kneaded for 40min;

[0040]Then take it out and dry it in a vacuum drying oven at 40°C for 20 minutes, then extrude and shape it. The molding material is placed in a drying oven at 120°C for pre-curing for 3 hours, and then the material is placed in an atmosphere furnace for carbonization and activation. The process parameters are: argon Atmosphere, the flow rate is controlled at 100ml / min, the heating rate is 5°C / min, the final temperature is set at 800°C, and maintained for 1h;

[0041] When the temperature drops to room temperature, take it out, rinse it with water until the pH value is 6, and dry it.

Embodiment 1-2

[0043] The clean coconut shell is dried and broken, crossed 100 mesh sieve, then get 50g coconut shell powder, add 1.5g scallop powder, mix well, add mixed solution (44g mass fraction is phosphoric acid of 85%, 2.5gK 2 HPO 4 , 15g water), placed in a kneader and kneaded for 30min;

[0044] Then take it out and dry it in a vacuum drying oven at 50°C for 30 minutes, then extrude and shape it. The molding material is placed in a drying oven at 110°C for pre-curing for 3 hours, and then the material is placed in an atmosphere furnace for carbonization and activation, in an argon atmosphere, and the flow rate is controlled as 100ml / min, the heating rate is 5°C / min, the final temperature is set at 800°C, and maintained for 1h;

[0045] When the temperature drops to room temperature, take it out, rinse it with water until the pH value is 6, and dry it.

Embodiment 1-3

[0047] The clean coconut shell is dried and broken, crossed a 100-mesh sieve, then gets 50g of coconut shell powder, adds 1.5g of field turnip powder, mixes evenly, adds mixed solution (44g mass fraction is phosphoric acid of 85%, 2.5gKNO 3 , 15g water), placed in a kneader and kneaded for 40min;

[0048] Then take it out and dry it in a vacuum drying oven at 40°C for 20 minutes, then extrude and shape it. The molding material is placed in a drying oven at 120°C for pre-curing for 3 hours, and then the material is placed in an atmosphere furnace for carbonization and activation. The process parameters are: argon Atmosphere, the flow rate is controlled at 100ml / min, the heating rate is 5°C / min, the final temperature is set at 800°C, and maintained for 1h;

[0049] When the temperature drops to room temperature, take it out, rinse it with water until the pH value is 6, and dry it.

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