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A kind of cobalt catalyst for synthesizing ammonia and preparation method thereof

A cobalt catalyst, a technology for synthesizing ammonia, applied in catalyst activation/preparation, ammonia preparation/separation, chemical instruments and methods, etc., to achieve the effect of good ammonia synthesis performance and good industrial application prospects

Inactive Publication Date: 2018-03-16
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a cobalt-based catalyst for synthesizing ammonia and a preparation method thereof, which aims at the deficiencies of cobalt catalysts and ruthenium catalysts used in the existing ammonia synthesis industry, and obtains a cobalt catalyst with better catalytic activity

Method used

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  • A kind of cobalt catalyst for synthesizing ammonia and preparation method thereof

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Effect test

Embodiment 1

[0021] 1) Dissolve 0.95g of barium nitrate in 20 mL of water to form a barium nitrate aqueous solution; then impregnate the barium nitrate aqueous solution into 5 g of graphitized activated carbon (with a specific surface area of ​​860 m 2 / g);

[0022] 2) Dissolve 2.47g of cobalt nitrate hexahydrate in 20mL of methanol after drying at 150°C for 24 hours;

[0023] 3) Add the methanol solution of cobalt nitrate obtained in step 2) to the barium-containing activated carbon in step 1), and impregnate at 30 °C for 0.5 hours;

[0024] 4) The obtained solid material was dried under an infrared lamp at 80 °C for 1 hour to remove the methanol solution, and then reduced in pure hydrogen at 450 °C for 6 hours to prepare a cobalt catalyst for ammonia synthesis.

Embodiment 2

[0026] 1) Dissolve 0.95g of barium nitrate and 0.52g of potassium nitrate in 20 mL of water to form a mixed aqueous solution of barium nitrate and potassium nitrate; then impregnate the mixed aqueous solution of barium nitrate and potassium nitrate into 5 g of graphitized activated carbon (specific surface area is 100m 2 / g);

[0027] 2) Dissolve 2.47g of cobalt nitrate hexahydrate in 20mL of ethanol after drying at 150°C for 0.2 hours;

[0028] 3) Add the ethanol solution of cobalt nitrate obtained in step 2) to the barium-containing activated carbon in step 1), and soak at 30 °C for 0.5 hours;

[0029] 4) The obtained solid matter was dried with an infrared lamp at 180 °C for 0.5 hours to remove the ethanol solution, and then placed in 25% H 2 +75%N 2 Reduction treatment at 430 °C for 12 hours in mixed gas to prepare cobalt catalyst for ammonia synthesis.

Embodiment 3

[0031] 1) Dissolve 1.43g of barium nitrate and 1.1g of sodium nitrate in 20 mL of water to form a mixed aqueous solution of barium nitrate and sodium nitrate; then impregnate the mixed aqueous solution of barium nitrate and sodium nitrate into 5 g of graphitized activated carbon (specific surface area is 1020m 2 / g);

[0032] 2) Dissolve 0.69g of cobalt nitrate hexahydrate in 20mL of propanol after drying at 100°C for 40 hours;

[0033] 3) Add the propanol solution of cobalt nitrate obtained in step 2) to the barium-containing activated carbon in step 1), and impregnate at 50 °C for 1.5 hours;

[0034] 4) The obtained solid matter was dried under infrared lamp at 60 °C for 2 hours to remove the propanol solution, and then in 75% H 2 +25%N 2 Reduction treatment at 450 °C for 12 hours in mixed gas to prepare cobalt catalyst for ammonia synthesis.

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Abstract

The invention discloses a cobalt catalyst for ammonia synthesis and a preparation method of the cobalt catalyst. The preparation method comprises the following steps: by taking graphitized activated carbon as a carrier, the cobalt element as an active component, and an alkaline earth element and an alkaline metal element as additives, firstly, introducing an alkaline earth metal compound and an alkaline metal compound into the graphitized activated carbon according to an impregnation method, drying cobaltous nitrate hexahydrate, dissolving in an anhydrous solvent, performing mixed dipping on the two components, drying, and reducing, so as to obtain the cobalt catalyst for ammonia synthesis. Compared with the conventional cobalt catalyst and a ruthenium catalyst, the cobalt catalyst disclosed by the invention is relatively good in ammonia synthesis activity, thus being relatively good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of ammonia synthesis catalysts, and in particular relates to a cobalt-based catalyst for ammonia synthesis and a preparation method thereof. Background technique [0002] Ammonia synthesis catalyst is the most important catalyst in the ammonia synthesis industry, which affects the production process and economic benefits of ammonia synthesis. The traditional ammonia synthesis catalyst is a molten iron catalyst. The production and use technology of this catalyst is relatively mature, but it requires high operating temperature and pressure, high requirements on equipment, and high energy consumption in the production process. Looking for a high activity at low temperature and low pressure Ammonia synthesis catalysts have always been the goal of people's efforts. Ruthenium catalyst is known as the second-generation ammonia synthesis catalyst after iron catalyst because of its excellent performance. Among them,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J37/18C01C1/04
CPCY02P20/52
Inventor 林炳裕林建新倪军江莉龙
Owner FUZHOU UNIV
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