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Method for preparing ammonia

A platinum nanowire and iron-platinum technology, which is applied in the field of catalyzing hydrogen and nitrogen to prepare ammonia, can solve the problems of no synthetic ammonia temperature and pressure drop, and no synthetic ammonia, and achieve the effects of reducing energy consumption, increasing temperature, and simple reaction devices

Active Publication Date: 2011-01-05
DAZIRAN BIOLOGICAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, none of the catalysts in the above-mentioned technical solutions effectively reduces the temperature and pressure of ammonia synthesis, nor does it realize ammonia synthesis under normal temperature and pressure.

Method used

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  • Method for preparing ammonia

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Embodiment 1

[0022] Synthesis of iron-platinum catalyst: reduction of platinum acetylacetonate in oleylamine at 160°C while thermal decomposition of iron pentacarbonyl yields FePt nanowires with a diameter of 2-3 nm (see Angew.Chem.Int.Ed.46 (2007), 6333-6335 ); electron microscope scanning was performed on the obtained nanowires, and the results were as follows figure 1 ,from figure 1 It was found that the diameter of the platinum nanowires was 2 to 3 nm.

Embodiment 2

[0024] Synthesis of platinum nanowires: reduction of platinum acetylacetonate in oleylamine at 160°C while thermal decomposition of iron pentacarbonyl yields FePt nanowires with a diameter of 2-3 nm (see Angew.Chem.Int.Ed.46(2007), 6333-6335 ), and then heated and stirred under acidic conditions to corrode the Fe wrapped around the Pt nanowires to obtain platinum nanowires, and the obtained nanowires were scanned by electron microscope. The results are as follows: figure 2 ,from figure 2 It was found that the diameter of the platinum nanowires was 2 to 3 nm.

Embodiment 3

[0026] Using Pt nanowires as a catalyst, the liquid phase reaction is used to synthesize ammonia, and the steps are as follows:

[0027] A certain amount of Pt nanowires were dispersed in water, the air in the reactor was evacuated under reduced pressure, and a mixed gas of nitrogen and hydrogen was introduced. The reacted gas was absorbed by dilute hydrochloric acid solution, and the solution was analyzed by the Neiss reagent method. The rate of ammonia formation is 103 μmolg -1 h -1 .

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Abstract

The invention belongs to the field of the synthesis of ammonia, in particular relates to a method for preparing the ammonia by catalyzing hydrogen and nitrogen. The ammonia is prepared from the hydrogen and the nitrogen serving as reactants by taking platinum nanowires or iron-platinum nanowires as a catalyst under 1-16 atmospheric pressure at the temperature of between 20 and 140 DEG C. In the method, the ammonia can be prepared from the hydrogen and the nitrogen which are catalyzed by the platinum nanowires or the iron-platinum nanowires serving as the catalyst under 1-16 atmospheric pressure at the temperature of between 20 and 140 DEG C, so that high-temperature and high-pressure reaction conditions are avoided, the required reaction device is simple, the energy consumption is reduced, and the method is more economic compared with the prior art; and the yield and the synthesis speed of the ammonia can be improved by improving the temperature and the pressure.

Description

technical field [0001] The invention belongs to the field of synthetic ammonia, in particular to a method for catalyzing hydrogen and nitrogen to prepare ammonia. Background technique [0002] Ammonia is an important chemical raw material, mainly used to produce fertilizers, nitric acid, ammonium salts, 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. Therefore, the improvement of ammonia synthesis process and catalyst will have a huge impact on reducing energy consumption and improving economic benefits. [0003] At present, the method of synthesizing ammonia in industry is mainly realized by making hydrogen and nitrogen at 100-600 atmospheres and 400-600 ℃ under the action of catalyst. The reaction is an exothermic and volume-reducing reaction. From ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/04
Inventor 顾宏伟路建美胡磊洪海燕李敏
Owner DAZIRAN BIOLOGICAL GRP CO LTD
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