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Method for synthetic ammonia

A technology for synthesizing ammonia and rare earth alloys, which is applied in the direction of ammonia preparation/separation, etc., can solve the problems that the temperature and pressure cannot be synthesized, and the synthesis of ammonia cannot be realized, so as to achieve good dissociation and activation, increase yield and synthesis speed, The effect of increasing temperature and pressure

Inactive Publication Date: 2003-04-30
PEKING UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

However, neither the traditional Fe-based catalysts nor the newly developed Ru-based catalysts in the past 20 years can effectively reduce the synthesis temperature and pressure, let alone realize the synthesis of ammonia under normal temperature and pressure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using rare earth samarium to prepare micron-sized powder of samarium hydride, the steps of synthesizing ammonia are as follows:

[0021] (1) Put the rare earth metal samarium in the sample crucible of the plasma heating furnace, and completely melt the metal samarium under the condition of Ar (about one atmospheric pressure) atmosphere.

[0022] (2) Heating is stopped, after vacuuming, hydrogen gas is introduced into the heating furnace, and samarium metal absorbs hydrogen gas to reach saturation during the cooling process, forming samarium hydrides, and pulverizing into micron-sized powders.

[0023] (3) Extract the residual gas, and pass air into the heating furnace.

[0024] (4) The samarium hydride micron particles react chemically with the oxygen and nitrogen in the air to finally produce ammonia. And Nessler's reagent test was used to prove that ammonia gas was generated.

Embodiment 2

[0026] Using rare earth cerium to prepare cerium hydride nanoparticles first, and then the steps of synthesizing ammonia are as follows:

[0027] (1) put rare earth metal cerium in the sample crucible of plasma heating furnace, in 10%H 2 Under the atmosphere condition of +90% Ar (total about one atmospheric pressure), metal cerium is evaporated and rapidly cooled to form nanoparticles.

[0028] (2) Heating is stopped, and the metal cerium nanoparticles react with hydrogen gas during the cooling process to form cerium hydride.

[0029] (3) After cooling, the residual gas is drawn out, and air is introduced into the heating furnace.

[0030] (4) The cerium hydride nanoparticles react chemically with oxygen and nitrogen in the air to finally produce ammonia.

[0031] And Nessler's reagent test was used to prove that ammonia gas was generated.

Embodiment 3

[0033] Add auxiliary synthetic ammonia conventional reaction catalyst Fe and promoter K 2 O and Al 2 o 3 , using rare earth neodymium to prepare neodymium hydride nanoparticles first, and then the steps of synthesizing ammonia are as follows:

[0034] (1) Synthetic ammonia conventional reaction catalyst Fe and promotor K 2 O and Al 2 o 3 Uniformly dispersed around the sample crucible of the plasma heating furnace, put the rare earth metal neodymium in the sample crucible of the plasma heating furnace, under 10% H 2 Under the atmosphere condition of +90% Ar (total about one atmospheric pressure), metal neodymium is evaporated and rapidly cooled to form nanoparticles, and these nanoparticles are deposited on Fe, K 2 O and Al 2 o 3 s surface.

[0035] (2) Heating is stopped, and the metal neodymium nanoparticles react with hydrogen during the cooling process to form neodymium hydrides.

[0036] (5) After cooling, extract the residual gas and pass air into the heating fur...

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PUM

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Abstract

A process for synthesizing ammonia includes such steps as heating the RE metal (or alloy) powder or block to the temp higher than the hydrogenation temp in the atmosphere preventing oxidizing and nitriding, introducing hydrogen gas to make the RE metal (or alloy) absorb hydrogen, introducing the mixture of oxygen and nitrogen gases or air, and chemical reaction. Its advantages are simple process and saving energy.

Description

Technical field: [0001] The invention belongs to the technical field of ammonia preparation. Background technique: [0002] In the early 20th century, Harber and Mittasch developed iron catalysts for the synthesis of ammonia, which laid the foundation for the industrial synthesis of ammonia. At present, the industrial production of ammonia is realized under the condition of 100-600 atmospheric pressure and 400-600° C. under the action of a catalyst to make hydrogen and nitrogen. In order to further reduce the reaction temperature and pressure, countries all over the world have never stopped the research and development of ammonia synthesis catalysts for a long time. In 1972, Aika et al. found that the ruthenium catalyst supported by activated carbon had high activity for ammonia synthesis. After the 1980s, the British BP company started to develop industrialized ruthenium catalyst with high activity. However, at present, countries in the world have not been able to develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/04
Inventor 李星国刘彤张耀华
Owner PEKING UNIV
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