Catalyst for ammonia synthesis and ammonia decomposition

A catalyst, ammonia decomposition technology, applied in the direction of physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, ammonia compound, etc., can solve problems such as inability to realize industrialization

Active Publication Date: 2014-08-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, some progress has been made in non-iron (ruthenium)-based ammonia synthesis and ammonia decomposition catalysts, but industrialization has not yet been achieved.

Method used

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  • Catalyst for ammonia synthesis and ammonia decomposition
  • Catalyst for ammonia synthesis and ammonia decomposition
  • Catalyst for ammonia synthesis and ammonia decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In an argon glove box, accurately weigh the lithium imide (Li 2 NH) 0.0300g, placed in a fixed-bed stainless steel reactor. The sample was heated to 400° C. in an argon atmosphere, and the argon flow rate was 30 mL / min. Cut into 5%NH after 20 minutes 3 / Ar mixed gas, the reaction gas flow rate was controlled at 1.8L / h and 3.6L / h, and samples were taken for analysis after 30 minutes. Test results such as image 3 shown. The conversion rate of ammonia gas increases approximately linearly with the increase of temperature, and the conversion rate of ammonia gas reaches 35% at 450 degrees.

Embodiment 2

[0023] In an argon glove box, accurately weigh potassium amide (KNH 2 ) 0.0300g, placed in a fixed-bed stainless steel reactor. The sample is heated to 400 degrees in an argon atmosphere, and cut into 5% NH after 20 minutes 3 / Ar mixed gas, the reaction gas flow rate was controlled at 1.8L / h and 3.6L / h, and samples were taken for analysis after 30 minutes. Test results such as image 3 shown. The ammonia conversion rate increases approximately linearly with the increase of temperature. At the same reaction temperature, its activity is slightly higher than that of lithium imide, and the conversion rate of ammonia can reach 35% at 440 degrees.

Embodiment 3

[0025] In an argon glove box, accurately weigh iron nitride (Fe 2 N) 1.0000g, and lithium amide (LiNH 2) 0.7300g, placed in a self-made stainless steel ball mill jar. After closing the ball milling tank, put it into a planetary ball mill (Fischt PM400), and the ball milling condition is 200rpm ball milling for 5 hours. The obtained sample Fe 2 N / LiNH 2 (molar ratio 0.5:2).

[0026] In an argon glove box, accurately weigh Fe 2 N / LiNH 2 (Molar ratio 0.5:2) 0.0350g, placed in a fixed-bed stainless steel reactor. The sample was in a reaction atmosphere (5%NH 3 / Ar mixed gas) to the desired temperature, the reaction gas flow rate was controlled at 1.8L / h and 3.6L / h, and samples were taken for analysis after 30 minutes. Test results such as Figure 4 shown. The conversion rate of ammonia gas increases gradually with the increase of temperature. When the temperature is 380 degrees, the conversion rate of ammonia gas can reach 22%. When the temperature is higher than 380 deg...

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Abstract

The invention relates to a catalyst for ammonia synthesis and ammonia decomposition, and contains nitrogen compounds of main group elements and correlative carriers and additives. As a novel catalytic material, the catalyst provided by the invention shows good catalytic activity in ammonia synthesis and ammonia decomposition reactions.

Description

technical field [0001] The invention relates to catalyst technology, and in particular provides a catalyst for ammonia synthesis and ammonia decomposition and its application in ammonia synthesis and ammonia decomposition reactions. Background technique [0002] Ammonia is the basic raw material for the production of important chemical products such as fertilizers, nitric acid, and plastics, and it is also a hydrogen source carrier with potential applications. Therefore, the synthesis and decomposition of ammonia is of great significance in industry. The direct catalytic conversion of nitrogen and hydrogen is the main means of industrial synthesis of ammonia. Due to the harsh reaction conditions and high equipment requirements for ammonia synthesis, the energy consumption is high, and the annual energy consumption is 1% of the world's total annual energy consumption. At present, the catalysts widely used in ammonia synthesis and ammonia decomposition are transition metal ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/78B01J23/04B01J23/58C01B3/04C01C1/04
CPCB01J27/24B01J31/12B01J31/18C01B3/047C01B3/065C01C1/026C01C1/0411Y02E60/36Y02P20/52B01J35/0006C01B3/025
Inventor 陈萍郭建平王培坤熊智涛胡大强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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