Method for Mechanochemical Ammonia Synthesis Catalyzed by Metal Oxide under Normal Temperature and Normal Pressure Water Phase Conditions

A mechanochemical and oxide technology, applied in the field of materials, can solve the problems of high equipment requirements, environmental pollution, high energy consumption, etc., and achieve the effects of low cost, no environmental pollution, and easy availability of sources.

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

AI Technical Summary

Problems solved by technology

The industrial ammonia synthesis reaction requires high temperature and high pressure conditions (300-550°C, 15-25 MPa). Thermal catalysis is carried out through iron-based catalysts, which requires high equipment and consumes a lot of energy, consuming 1-2% of the world's total energy. and emit large amounts of CO 2 , causing serious environmental pollution

Method used

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  • Method for Mechanochemical Ammonia Synthesis Catalyzed by Metal Oxide under Normal Temperature and Normal Pressure Water Phase Conditions
  • Method for Mechanochemical Ammonia Synthesis Catalyzed by Metal Oxide under Normal Temperature and Normal Pressure Water Phase Conditions
  • Method for Mechanochemical Ammonia Synthesis Catalyzed by Metal Oxide under Normal Temperature and Normal Pressure Water Phase Conditions

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Experimental program
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Effect test

Embodiment 1

[0021] (1) 50mL of pure water, 3gFe 2 O 3 Solid powder, 150g total mass of different sizes of stainless steel grinding ball placed in stainless steel 250mL volume vacuum ball mill tank, the ball mill tank into the nitrogen for 30 minutes, exclude the air in the tank, seal the ball mill tank, so that the tank body is in the normal temperature and pressure full of nitrogen environment, the volume of nitrogen is 190mL;

[0022] (2) Install the ball mill tank prepared in step (1) in the planetary ball mill, ball grind at a rate of 600 rpm for 5 hours, and remove the ball mill tank after completing the reaction;

[0023] (3) Remove the suspension in step (2) of the tank, centrifuge twice with a centrifuge, 15000r / min each time, 5min, separate the solid metal oxide catalyst and aqueous solution;

[0024] (4) The aqueous solution in step (3) was detected by ion chromatography to detect NH 4 +the concentration of which results in ammonia production performance. At the same time, X-ray di...

Embodiment 2

[0027] (1) 50mL of pure water, 3gTiO 2 Solid powder, 150g total mass of different sizes of stainless steel grinding ball placed in stainless steel 250mL volume vacuum ball mill tank, the ball mill tank into the nitrogen for 30 minutes, exclude the air in the tank, seal the ball mill tank, so that the tank body is in the normal temperature and pressure full of nitrogen environment, the volume of nitrogen is 190mL;

[0028] (2) Install the ball mill tank prepared in step (1) in the planetary ball mill, ball grind at a rate of 600 rpm for 5 hours, and remove the ball mill tank after completing the reaction;

[0029] (3) Remove the suspension in step (2) of the tank, centrifuge twice with a centrifuge, 15000r / min each time, 5min, separate the solid metal oxide catalyst and aqueous solution;

[0030] (4) The aqueous solution in step (3) was detected by ion chromatography to detect NH 4 + the concentration of which results in ammonia production performance. At the same time, X-ray diff...

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Abstract

The invention belongs to the technical field of materials, and specifically relates to a method for mechanochemically synthesizing ammonia by metal oxide catalysis under normal temperature and pressure water phase conditions. In the present invention, a planetary ball mill is used for mechanochemical ball milling synthesis, stainless steel balls, metal oxide powder, pure water are placed in a stainless steel ball mill tank and nitrogen gas is introduced, and ball milling is performed directly at normal temperature and pressure. After the reaction is completed, the solution is left to stand, Centrifuge and verify the presence of ammonium ions (NH 4 + ). In the present invention, the metal oxide Fe 2 o 3 or TiO 2 As an auxiliary catalyst, it reduces the barrier of ammonia synthesis reaction, induces and promotes the synthesis ammonia reaction that is difficult to carry out under normal temperature and pressure, and enhances the performance of the mechanochemical synthesis ammonia reaction. The invention uses nitrogen as the source of nitrogen atoms and water as the source of hydrogen protons to avoid environmental pollution caused by hydrogen production; uses water as a reactant to alleviate the wear of balls and ball milling tanks and prolong the service life of ball milling equipment.

Description

Technical field [0001] The present invention belongs to the field of materials technology, specifically relates to a metal oxide-assisted catalytic mechanochemical synthesis of ammonia under atmospheric temperature and atmospheric pressure aqueous phase conditions. Background [0002] Current synthetic ammonia (NH 3 Industry is carried out mainly through the Haber-Bosch process. The reaction increased food production in the field of agricultural fertilizer production, feeding a large population around the world, while being crucial in the field of defense in the field of explosives production, it is hailed as the most important invention of the 20th century. Industrial ammonia synthesis reaction requires high temperature, high pressure conditions (300-550 °C, 15-25 MPa), thermal catalysis by iron-based catalysts, high equipment requirements, and large energy consumption, consuming 1-2% of the world's total energy, and emitting a large amount of CO 2 , causing serious environmenta...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01C1/04B01J21/06B01J23/745B02C17/10B04B5/10B04B13/00
CPCC01C1/04B02C17/10B04B5/10B04B13/00B01J23/745B01J21/063B04B2005/105Y02P20/52
Inventor何承溧崔晓莉陈阳邱栋陆雨瑄
OwnerFUDAN UNIV