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Method for enhancing the selectivity of synthetic ammonia by ball milling nitrogen-hydrogen mixed gas under normal temperature and pressure water phase

A technology of mixing nitrogen and hydrogen to synthesize ammonia, which is applied in the field of materials, can solve the problems of environmental pollution, large energy consumption, and high equipment requirements, and achieve the effects of improving selectivity, prolonging service life, and alleviating wear

Active Publication Date: 2022-05-20
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process requires high equipment, consumes a lot of energy, and causes serious environmental pollution.

Method used

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  • Method for enhancing the selectivity of synthetic ammonia by ball milling nitrogen-hydrogen mixed gas under normal temperature and pressure water phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Put 50mL of pure water and 300g of stainless steel balls of different sizes in a stainless steel vacuum ball milling jar with a capacity of 250mL, and inject nitrogen-hydrogen mixture gas (10 vol% H 2 + 90vol%N 2 ) for 30 minutes, get rid of the air in the tank, seal the ball mill tank so that the tank is in an environment full of nitrogen-hydrogen mixture at normal temperature and pressure, and the volume of the mixture is 180mL;

[0020] (2) Install the ball mill jar prepared in step (1) in a planetary ball mill, mill at a rate of 600 rpm for 10 hours, and take out the ball mill jar after the reaction is completed;

[0021] (3) Take out the solution in the tank in step (2), let it stand still, take the supernatant, and centrifuge twice through the centrifuge to further remove the iron filings generated during the ball milling process, each time at 15000r / min, 5min;

[0022] (4) Detect the aqueous solution in step (3) by ion chromatography, and measure the NH in ...

Embodiment 2

[0025] (1) Put 50mL of pure water and 300g of stainless steel balls of different sizes in a stainless steel vacuum ball milling jar with a volume of 250mL, and inject a nitrogen-hydrogen mixture (5vol% H 2 + 95vol%N 2 ) for 30 minutes, get rid of the air in the tank, seal the ball mill tank so that the tank is in an environment full of nitrogen-hydrogen mixture at normal temperature and pressure, and the volume of the mixture is 180mL;

[0026] (2) Install the ball mill jar prepared in step (1) in a planetary ball mill, mill at a rate of 600 rpm for 10 hours, and take out the ball mill jar after the reaction is completed;

[0027] (3) Take out the solution in the tank in step (2), let it stand still, take the supernatant, and centrifuge twice through the centrifuge to further remove the iron filings generated during the ball milling process, each time at 14000r / min, 7min;

[0028] (4) Detect the aqueous solution in step (3) by ion chromatography, and measure the NH in the so...

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Abstract

The invention belongs to the technical field of materials, and specifically relates to a method for enhancing the selectivity of synthetic ammonia by ball-milling nitrogen-hydrogen mixed gas in a water phase at normal temperature and pressure. In the present invention, a planetary ball mill is used for mechanochemical ball mill synthesis. Stainless steel balls and pure water are placed in a stainless steel ball mill tank, and nitrogen-hydrogen mixed gases of different volume ratios are introduced, and ball milled directly at normal temperature and pressure. After the reaction is completed The solution was left to stand and centrifuged, and the presence of ammonium ions (NH 4 + ) and measure the corresponding NH 4 + concentration. The invention injects nitrogen-hydrogen mixed gas into the water, increases the source and concentration of hydrogen protons required in the ammonia synthesis reaction, promotes the forward reaction, greatly improves the selectivity of the mechanical ball milling ammonia synthesis reaction, and enhances the performance of the mechanochemical ball milling ammonia synthesis reaction. At the same time, water is used as a reactant, which alleviates the wear of the ball and the ball mill tank and prolongs the service life of the ball mill equipment.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for mechanically ball-milling nitrogen-hydrogen mixed gas in water phase at normal temperature and pressure to enhance the reaction selectivity of synthetic ammonia. Background technique [0002] Ammonia (NH 3 ) plays a vital role in the fields of industry, agriculture, national defense, etc., and is an important raw material for synthetic fertilizers, fibers and explosives. Ammonia has a low liquefaction pressure (~8 atm) and high hydrogen density (17.8 wt%), which can serve as a potential hydrogen carrier. Ammonia synthesis is currently mainly carried out through the Haber-Bosch process, which requires high temperature (300-550°C), high pressure (15-25 MPa) conditions, and thermal catalysis under an iron-based catalyst. This process requires high equipment, consumes a lot of energy, and causes serious environmental pollution. Therefore, it is necessary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/04
CPCC01C1/04Y02P20/52
Inventor 何承溧崔晓莉陈阳邱栋陆雨瑄
Owner FUDAN UNIV
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