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Preparation method of core-shell-shaped nano composite metal oxide

A nano-composite, oxide technology, applied in chemical instruments and methods, iron compounds, manganese oxide/manganese hydroxide, etc., can solve the problem of low catalytic performance, achieve simple synthesis method, improve the excellent functional properties of particles, and improve catalytic performance. performance effect

Active Publication Date: 2019-04-16
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, single metal oxides are mostly used as combustion catalysts, with low catalytic performance

Method used

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  • Preparation method of core-shell-shaped nano composite metal oxide
  • Preparation method of core-shell-shaped nano composite metal oxide
  • Preparation method of core-shell-shaped nano composite metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030](1) Dissolve 1.948g of lanthanum nitrate hexahydrate and 1.818g of ferric nitrate nonahydrate in a mixed solution of 90mL of ethanol and water (volume ratio of ethanol to water: 2:1), after vigorous stirring, add 0.08mol citric acid, Continue to stir until completely dissolved, then transfer the mixed solution to a polytetrafluoroethylene high-pressure reactor, react at 180°C for 24 hours, wash the precipitated product with ethanol and deionized water, dry to obtain a light green powder, and calcinate at 800°C for 4 hours to obtain iron Lanthanum acid powder.

[0031] (2) Disperse 100 mg of the obtained lanthanum ferrite in 30 mL of deionized water and sonicate for 1 h.

[0032] (3) Dissolve 0.142g of potassium permanganate in the above solution and stir for 1h.

[0033] (4) Put it in a 50mL hydrothermal kettle and react at 160°C for 12h.

[0034] (5) The precipitated product obtained from the reaction is repeatedly washed with ethanol and deionized water, and dried to...

Embodiment 2

[0043] Dissolve ferric nitrate and lanthanum nitrate in a mixed solvent of ethanol and water, then add citric acid, react in a high-pressure reactor at 180°C for 24 hours, filter and calcinate at 800°C for 6 hours to obtain lanthanum ferrite; among them, ferric nitrate The ratio of the amount of substance to lanthanum nitrate is 1:1. The volume ratio of ethanol and water in the mixed solvent of ethanol and water is 2:1. The ratio of lanthanum nitrate to the mixed solvent of ethanol and water is 1.948g:90mL. The ratio of lanthanum nitrate to citric acid is 1.948g:0.08mol.

[0044] Disperse the obtained lanthanum ferrite in deionized water, add potassium permanganate, react in a hydrothermal reaction kettle at 180° C. for 12 hours, wash and dry to obtain a core-shell structure core-shell nano-composite metal oxide. Wherein, the ratio of lanthanum ferrite to deionized water is 100mg:30mL. The mass ratio of lanthanum ferrite to potassium permanganate is 1:1.5.

Embodiment 3

[0045] Example 3 Dissolve ferric nitrate and lanthanum nitrate in a mixed solvent of ethanol and water, then add citric acid, react in an autoclave at 190°C for 24 hours, filter and calcinate at 900°C for 4 hours to obtain lanthanum ferrite; , the ratio of the amount of iron nitrate to lanthanum nitrate is 1:1.2. The volume ratio of ethanol and water in the mixed solvent of ethanol and water is 2.1:1. The ratio of lanthanum nitrate to the mixed solvent of ethanol and water is 1.948g:90mL. The ratio of lanthanum nitrate to citric acid is 1.948g:0.08mol.

[0046] Disperse the obtained lanthanum ferrite in deionized water, add potassium permanganate, react in a hydrothermal reaction kettle at 170° C. for 18 hours, wash and dry to obtain a core-shell structure core-shell nano-composite metal oxide. Wherein, the ratio of lanthanum ferrite to deionized water is 100mg:30mL. The mass ratio of lanthanum ferrite to potassium permanganate is 1:1.42.

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Abstract

The invention discloses a preparation method of a core-shell-shaped nano composite metal oxide. Ferric nitrate and lanthanum nitrate are dissolved in a mixed solvent of ethanol and water, citrin is added, reaction is conducted in a high-pressure reaction kettle for 24 hours at the temperature of 180-190 DEG C, filtering is conducted before calcination, and lanthanum ferrite is obtained, the lanthanum ferrite is dispersed in deionized water, potassium permanganate is added, reaction is conducted in a hydrothermal reaction kettle for 12-14 hours at the temperature of 160-180 DEG C, and the core-shell-shaped nano composite metal oxide is obtained after drying and washing are conducted. The prepared core-shell MnO2@LaFeO3 has higher catalytic activity and can be taken as a combustion rate regulator of a solid propellant.

Description

technical field [0001] The invention relates to a method for preparing a core-shell nano-composite metal oxide, which belongs to the technical field of material preparation. The composite metal oxide can be used as a combustion catalyst of a solid propellant. Background technique [0002] Solid propellants play a very important role in research fields such as aerospace and military technology. At present, the development of solid propellants is developing in the direction of high energy, insensitivity, low characteristic signal and environmental protection. Ammonium perchlorate (AP), Octogen (HMX), and hexanitrohexaazaisowurtzitane (CL-20) are commonly used oxidants in solid propulsion, and their thermal decomposition performance is directly related to the propellant combustion behavior , the lower the thermal decomposition temperature and apparent activation energy, the higher the propellant burning rate. Researchers initially focused on the study of single metal oxides (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01G49/00C06D5/00
CPCC01G45/02C01G49/0054C01P2002/72C01P2002/85C01P2004/03C01P2004/04C01P2004/82C06D5/00
Inventor 郭雨郭兆琦张婷李瑶瑶马海霞
Owner NORTHWEST UNIV(CN)
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