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Preparation method of Mn2O3 having yolk-eggshell structure

A technology of manganese trioxide and eggshell, which is applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of manganese trioxide that have not been reported, and achieve the effect of uniform shape, good dispersion and short reaction cycle

Inactive Publication Date: 2017-05-31
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, as far as the applicant knows, there has not been reported a method for using microwave liquid phase to assist in the synthesis of manganese trioxide with egg yolk-eggshell structure.

Method used

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  • Preparation method of Mn2O3 having yolk-eggshell structure
  • Preparation method of Mn2O3 having yolk-eggshell structure
  • Preparation method of Mn2O3 having yolk-eggshell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Manganese nitrate and urea are dissolved in deionized water respectively, the molar concentration of manganese ions in the solution after dissolving is 1mol / L, and the molar concentration of urea is 1mol / L, and it is standby after fully dissolving;

[0017] (2) Mix the two solutions obtained in step (1), the mixing ratio is that the molar ratio of manganese ions to urea is 1:3; condense and reflux for 60 minutes under the microwave excitation heating condition with a power of 700W, and cool to room temperature naturally Centrifugal separation obtains manganese carbonate precursor;

[0018] (3) Put the manganese carbonate precursor obtained in the previous step into a high-temperature furnace for heat treatment at 400° C. for 5 hours, and cool down to room temperature with the furnace to obtain manganese trioxide with egg yolk-eggshell structure.

[0019] figure 1 For the X-ray diffraction pattern of the manganese trioxide with egg yolk-eggshell structure prepared i...

Embodiment 2

[0021] (1) Manganese acetate and sodium hydroxide are dissolved in deionized water and ethylene glycol respectively, and the molar concentration of manganese ion in the solution after dissolving is 0.1mol / L, and the molar concentration of sodium hydroxide is 0.5mol / L, fully ready after dissolving;

[0022] (2) two kinds of solutions that step (1) gained are mixed, and the mixing ratio is that the mol ratio of manganese ion and sodium hydroxide is 1:1; Under the microwave excitation heating condition that power is 700W, condense and reflux for 60 minutes, cool naturally to centrifugation after room temperature to obtain the manganese carbonate precursor;

[0023] (3) Put the manganese carbonate precursor obtained in the previous step into a high-temperature furnace for heat treatment at 450° C. for 6 hours, and cool down to room temperature with the furnace to obtain manganese trioxide with egg yolk-eggshell structure.

Embodiment 3

[0025] (1) manganese sulfate and sodium hydroxide are dissolved in deionized water and Virahol respectively, the molar concentration of manganese ion in the solution after dissolving is 0.2mol / L, and the molar concentration of sodium hydroxide is 0.5mol / L, fully ready after dissolving;

[0026] (2) two kinds of solutions that step (1) gained are mixed, and the mixing ratio is that the mol ratio of manganese ion and sodium hydroxide is 1:2; Under the microwave excitation heating condition that power is 700W, condense and reflux for 60 minutes, cool naturally to centrifugation after room temperature to obtain the manganese carbonate precursor;

[0027] (3) Put the manganese carbonate precursor obtained in the previous step into a high-temperature furnace for heat treatment at 500° C. for 3 hours, and cool down to room temperature with the furnace to obtain manganese trioxide with egg yolk-eggshell structure.

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Abstract

The invention relates to a preparation method of Mn2O3 having a yolk-eggshell structure. The method mainly includes the steps of: respectively preparing a manganese salt solution and an alkaline reagent solution, and after complete dissolution, adding the solutions into a reaction container according to the molar ratio of manganese ion to alkaline reagent being 1:(1-8), stirring the solutions, and performing reflux condensation under a microwave-stimulated heating condition, naturally cooling the mixture to room temperature and centrifugally separating the mixture to obtain a manganese carbonate precursor; thermally-treating the manganese carbonate precursor in a high-temperature furnace at 200-700 DEG C for 1-10 h, and cooling the product in the furnace to room temperature to prepare the Mn2O3 having a yolk-eggshell structure. The preparation method is simple, is easy to carry out, is low in cost, allows controllable preparation and mass synthesis, and is beneficial to industrial mass production.

Description

technical field [0001] The invention belongs to the technical field of preparation of metal oxide materials, and in particular relates to a preparation method of manganese trioxide having an egg yolk-eggshell structure. Background technique [0002] Dimanganese trioxide has a wide range of uses. Its high catalytic activity can be used to decompose toxic gases in the field of environmental protection. It can be used as a high-performance oxidant in the synthesis process of organic substances such as chlorobenzaldehyde and p-bromobenzaldehyde. In addition, manganese trioxide can also be used as an anode material for lithium-ion batteries and an electrode material for supercapacitors. [0003] The morphology and structure of materials determine their physical and chemical properties. In recent years, yolk-shell structure (yolk-shell structure) materials have endowed materials with excellent performance due to their special core / void / shell shape, and the movable core can improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
CPCC01G45/02C01P2002/72C01P2004/03C01P2004/04C01P2004/61
Inventor 曹传宝吴宇张君婷
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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