Low-pressure synthesized ammonia catalyst and preparation method thereof

A technology for catalysts and ammonia synthesis, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as insufficient activity, high temperature and high pressure, and reduce energy consumption , long service life, and the effect of improving economic benefits

Active Publication Date: 2016-02-03
赵康军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many large factories still use the traditional molten iron catalyst, due to its high temperature and high pressu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A low-pressure ammonia synthesis catalyst, the atomic percentage of chemical composition is: neodymium 12.5%, iron 65.4%, cobalt 15%, gallium 0.5%, zirconium 0.1%, boron 6.5%.

[0017] The preparation method of above-mentioned catalyst is as follows:

[0018] 1) According to the content of the above components, take the raw materials required for each component and add them to the intermediate frequency vacuum melting furnace and mix them;

[0019] 2) After evacuating the vacuum melting furnace, heat it to melt the mixed raw materials in it. The vacuum degree is 0.006 Pa. After all the raw materials are melted to a liquid state and homogenized, cool to room temperature;

[0020] 3) The cooled frit is crushed, ball milled and sieved to obtain a powdery solid catalyst.

[0021] The method for synthesizing ammonia in this embodiment is: using the catalyst prepared in this embodiment as a catalyst, and making hydrogen and nitrogen react on the catalyst to synthesize ammoni...

Embodiment 2

[0023] A low-pressure ammonia synthesis catalyst, its chemical composition atomic percentage content is: 22% neodymium, 50% iron, 18% cobalt, 0.3% gallium, 0.2% zirconium, 9.5% boron.

[0024] The preparation method of above-mentioned catalyst is as follows:

[0025] 1) According to the content of the above components, take the raw materials required for each component and add them to the intermediate frequency vacuum melting furnace and mix them;

[0026] 2) Vacuumize the vacuum melting furnace and heat the mixed raw materials in it to melt. The vacuum degree is 0.001Pa. After all the raw materials are melted to a liquid state and homogenized, cool to room temperature;

[0027] 3) The cooled frit is crushed, ball milled and sieved to obtain a powdery solid catalyst.

[0028] The method for synthesizing ammonia in this embodiment is: using the catalyst prepared in this embodiment as a catalyst, and making hydrogen and nitrogen react on the catalyst to synthesize ammonia. The...

Embodiment 3

[0030] A low-pressure ammonia synthesis catalyst, its chemical composition atomic percentage content is: 20% neodymium, 60% iron, 12% cobalt, 0.8% gallium, 0.1% zirconium, 7.1% boron. The preparation method of above-mentioned catalyst is as follows:

[0031] 1) According to the content of the above components, take the raw materials required for each component and add them to the intermediate frequency vacuum melting furnace and mix them;

[0032] 2) Vacuum the melting furnace and heat it to melt the mixed raw materials in it. The vacuum degree is 0.005Pa. After all the raw materials are melted to a liquid state and homogenized, cool to room temperature;

[0033] 3) The cooled frit is crushed, ball milled and sieved to obtain a powdery solid catalyst.

[0034] The method for synthesizing ammonia in this embodiment is: using the catalyst prepared in this embodiment as a catalyst, and making hydrogen and nitrogen react on the catalyst to synthesize ammonia. The catalyst prepar...

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Abstract

The invention discloses a low-pressure synthesized ammonia catalyst. The atomic percentage of chemical ingredients of the low-pressure synthesized ammonia catalyst is as follows: 10 to 22 percent of neodymium, 50 to 85 percent of iron, 1 to 18 percent of cobalt, 0.3 to 1 percent of gallium, 0.01 to 0.2 percent of zirconium and 1 to 11 percent of boron. The catalyst has high catalytic effect under 100 to 300 DEG C and 0.1MPa to 10MPa, and especially under the reaction condition of 100MPa, 10000h<-1> and 100 DEG C, the concentration of ammonia at an outlet reaches 29.2 percent. Compared with the existing industrial ammonia synthetic iron catalyst, the low-pressure synthesized ammonia catalyst has the characteristics of low temperature, low pressure and high activity and is wide in application prospect.

Description

technical field [0001] The invention relates to a catalyst for industrial chemical ammonia synthesis, in particular to a low-pressure ammonia synthesis catalyst. Background technique [0002] Synthetic ammonia is an important chemical raw material, mainly used to produce fertilizer, nitric acid, ammonium salt, soda ash, etc. As one of the pillar industries of the chemical industry, the synthetic ammonia industry occupies an important position in the national economy. At the same time, synthetic ammonia is also a large tonnage, high energy consumption, and low-efficiency industry. About 10% of the world's energy is used for ammonia production, so improvements in ammonia synthesis processes and catalysts will have a huge impact on fossil fuel consumption. Ammonia synthesis reaction is a reversible exothermic and gas volume reduction process. From a thermodynamic point of view, to achieve or approach the equilibrium conversion rate, the catalytic reaction should be carried out...

Claims

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Application Information

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IPC IPC(8): B01J23/825
Inventor 赵康军
Owner 赵康军
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