A kind of ruthenium series ammonia synthesis catalyst and its preparation method and application

A technology of ammonia synthesis and catalyst, applied in the field of ruthenium ammonia synthesis catalyst and its preparation, can solve the problems of poor stability and low catalytic performance, achieve the effects of preventing agglomeration, improving catalytic activity and avoiding direct contact

Active Publication Date: 2021-11-19
FUZHOU UNIV ASSET MANAGEMENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome the defects of poor stability and low catalytic performance of the ruthenium-based ammonia synthesis catalyst in the prior art, thereby providing a ruthenium-based ammonia synthesis catalyst and its preparation method and application

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  • A kind of ruthenium series ammonia synthesis catalyst and its preparation method and application
  • A kind of ruthenium series ammonia synthesis catalyst and its preparation method and application
  • A kind of ruthenium series ammonia synthesis catalyst and its preparation method and application

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Embodiment 1

[0054] The present embodiment provides a kind of ruthenium series ammonia synthesis catalyst, and its preparation method is as follows:

[0055] The preparation method of graphitized activated carbon: Take 20g of activated carbon and crush it to 15-20 mesh, put it in an intermediate frequency furnace, treat it in an argon atmosphere at 1800 ° C for 2 hours, cool it to room temperature in the above atmosphere, and use air oxidation at 400 ° C to expand the pores , that is graphitized activated carbon, the specific surface area of ​​the graphitized activated carbon is 800m 2 / g, the pore volume is 0.5cm 3 / g.

[0056] Preparation of mixed solution: add ruthenium nitrosonitrate, barium nitrate, cerium nitrate, and potassium nitrate into deionized water in a ratio of 2:3:1:3 with the mass ratio of ruthenium, barium, cerium, and potassium, and stir evenly. The pH of the solution was adjusted to 1 with nitric acid.

[0057] Catalyst preparation: Take 10 g of the above-mentioned g...

Embodiment 2

[0061] The present embodiment provides a kind of ruthenium series ammonia synthesis catalyst, and its preparation method is as follows:

[0062] The preparation method of graphitized activated carbon: Take 20g of activated carbon and crush it to 15-20 mesh, put it in an intermediate frequency furnace, treat it in an argon atmosphere at 1800 ° C for 2 hours, cool it to room temperature in the above atmosphere, and use air oxidation at 400 ° C to expand the pores , that is graphitized activated carbon, the specific surface area of ​​the graphitized activated carbon is 800m 2 / g, the pore volume is 0.5cm 3 / g.

[0063] Preparation of mixed solution: add ruthenium nitrosonitrate, barium nitrate, cerium nitrate, and potassium nitrate into deionized water in a ratio of 2:3:1:3 with the mass ratio of ruthenium, barium, cerium, and potassium, and stir evenly. The pH of the solution was adjusted to 2 with acetic acid.

[0064] Catalyst preparation: Take 10 g of the above-mentioned g...

Embodiment 3

[0068] The present embodiment provides a kind of ruthenium series ammonia synthesis catalyst, and its preparation method is as follows:

[0069] The preparation method of graphitized activated carbon: Take 20g of activated carbon and crush it to 15-20 mesh, put it in an intermediate frequency furnace, treat it in an argon atmosphere at 1800 ° C for 2 hours, cool it to room temperature in the above atmosphere, and use air oxidation at 400 ° C to expand the pores , that is graphitized activated carbon, the specific surface area of ​​the graphitized activated carbon is 800m 2 / g, the pore volume is 0.5cm 3 / g.

[0070] Preparation of mixed solution: add ruthenium nitrosonitrate, barium nitrate, cerium nitrate, and potassium nitrate into deionized water in a ratio of 3:6:2:6 in a mass ratio of ruthenium, barium, cerium, and potassium, and stir evenly. The pH of the solution was adjusted to 1 with nitric acid.

[0071] Catalyst preparation: take 10 g of the above-mentioned graph...

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Abstract

The invention provides a ruthenium-based ammonia synthesis catalyst and its preparation method and application; the ruthenium-based ammonia synthesis catalyst includes a core-shell structure Ru-Ba-A, and the core-shell structure Ru-Ba-A includes ruthenium as a core Nanoparticles and a first shell and a second shell wrapped on the inner core in turn, the first shell is barium nanoparticles, and the second shell is metal oxide. The ruthenium-based ammonia synthesis catalyst provided by the present invention adopts the above-mentioned core-shell structure Ru-Ba-A, and surrounds the core ruthenium nanoparticles with barium nanoparticles and metal oxides from the inside to the outside in order to effectively prevent the ruthenium from being damaged during the use of the catalyst. Agglomeration of nanoparticles prevents direct contact between ruthenium nanoparticles and metal oxides, and barium nanoparticles have a promoting effect as an electronic additive, which can effectively improve the stability and catalytic activity of ruthenium-based ammonia synthesis catalysts, especially in the process of using coal to gas Stability and catalytic activity in systems for the synthesis of ammonia.

Description

technical field [0001] The invention relates to the technical field of ammonia synthesis catalyst preparation, in particular to a ruthenium-based ammonia synthesis catalyst and its preparation method and application. Background technique [0002] Ammonia is the main raw material for fertilizers and basic organic chemicals, therefore, the synthetic ammonia industry occupies an important position in the agricultural and chemical industries. The progress of ammonia synthesis industry over the years is largely due to the improvement of catalyst quality. Although ammonia synthesis catalysts account for a very small proportion in the ammonia synthesis process, ammonia synthesis catalysts directly affect the output and economic benefits of ammonia synthesis. . [0003] Ruthenium-based ammonia synthesis catalysts are considered to be the second-generation ammonia synthesis catalysts after iron catalysts, which are usually composed of three parts: carrier, active metal ruthenium and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J23/58B01J35/10B01J37/02B01J37/08B01J37/16C01C1/04
CPCB01J23/63B01J23/58B01J23/002B01J35/023B01J35/1023B01J35/1028B01J35/1042B01J35/0086B01J37/0201B01J37/0236B01J37/088B01J37/16C01C1/0411B01J2523/00B01J2523/13B01J2523/25B01J2523/3712B01J2523/3706B01J2523/47B01J2523/31B01J2523/27Y02P20/52B01J21/18B01J23/462B01J35/002B01J35/0053B01J35/006B01J35/008B01J37/0213B01J23/04B01J35/0013B01J35/1038B01J37/0203B01J37/086
Inventor 江莉龙倪军林建新何盛宝林科林炳裕林性贻
Owner FUZHOU UNIV ASSET MANAGEMENT CO LTD
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