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A method for preparing multi-component mesoporous metal oxides by hard template

An oxide and hard template technology, applied in the field of preparation of multi-element mesoporous metal oxides, can solve the problems of high density and narrow absorption band, and achieve the effects of simple preparation method, improved wave absorption performance, and improved crystallinity

Active Publication Date: 2015-09-30
苏州远略知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing multi-component mesoporous metal oxides through a hard template to solve the problems of narrow absorption frequency band and high density of traditional ferrite absorbing materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take x=1, namely n(MgCl 2 ·6H 2 O): n(AlCl 3 ): n(FeCl 3 ·6H 2 O) =1:1:9.

[0018] 1) First add 5 grams of mesoporous foamed silica into 50 grams of chloroform, ultrasonically disperse for 4 hours, then add 0.09mol FeCl 3 ·6H 2 O, 0.01mol AlCl 3 and 0.01mol MgCl 2 ·6H 2 O, add ammonia solution with a mass fraction of 10% to adjust the pH of the solution to 8, stir for 2 hours, let stand for 1 hour, filter, wash with water and dry to obtain nanopowder.

[0019] 2) Carry out high-temperature calcination on the dried nano-powder: under the protection of nitrogen atmosphere, heat from room temperature to 800°C, the heating rate is 6°C / min, maintain 800°C for 1 hour, and finally cool down with the furnace under the protection of nitrogen , the prepared multi-component mesoporous metal oxide is MgAlFe 9 o 16 .

Embodiment 2

[0021] Take x=0, namely n(MgCl 2 ·6H 2 O): n(FeCl 3 ·6H 2 O) =1:10.

[0022] 1) First add 5 grams of mesoporous foamed silica to 50 grams of chloroform, ultrasonically disperse for 6 hours, and then add 0.1mol FeCl 3 ·6H 2 O and 0.01mol MgCl 2 ·6H 2 O, add ammonia solution with a mass fraction of 15% to adjust the pH of the solution to 10, stir for 5 hours, let stand for 3 hours, filter, wash with water and dry to obtain nanopowder.

[0023] 2) Carry out high-temperature calcination on the dried nano-powder: under the protection of nitrogen atmosphere, heat from room temperature to 800°C, the heating rate is 6°C / min, maintain 800°C for 1 hour, and finally cool down with the furnace under the protection of nitrogen , the prepared multi-component mesoporous metal oxide is MgFe 10 o 16 .

Embodiment 3

[0025] Take x=0.5, namely n(MgCl 2 ·6H 2 O): n(AlCl 3 ): n(FeCl 3 ·6H 2 O) =1:0.5:9.5.

[0026] 1) First add 5 grams of mesoporous foamed silica into 50 grams of chloroform, ultrasonically disperse for 5 hours, and then add 0.095mol FeCl 3 ·6H 2 O, 0.005mol AlCl 3 and 0.01mol MgCl 2 ·6H 2 O, adding a mass fraction of 15% ammonia solution to adjust the pH of the solution to 9, stirring for 3 hours, standing for 2 hours, filtering, washing and drying to obtain nanopowder.

[0027] 2) Carry out high-temperature calcination on the dried nano-powder: under the protection of nitrogen atmosphere, heat from room temperature to 800°C, the heating rate is 6°C / min, maintain 800°C for 1 hour, and finally cool down with the furnace under the protection of nitrogen , the prepared multi-component mesoporous metal oxide is MgAl 0.5 Fe 9.5 o 16 .

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Abstract

The invention relates to a method for preparation of a multi-element mesoporous metal oxide by a hard template. The method uses mesoporous foam silica as the hard template, and chloroform as a solvent, FeCl3.6H2O, AlCl3 and MgCl2. 6H2O with a stoichiometric ratio of n (MgCl2.6H2O): n (AlCl3): n (FeCl3. 6H2O) of 1:x:10-x,(0<= x<= 1) are added, and the multi-element mesoporous metal oxide is obtained by ultrasonic dispersion, stirring, standing, filtering, water washing, drying and calcination at high temperature. The method has the advantages that: 1) the multi-element metal oxide mesoporous material has ferroelectric, ferromagnetic and dielectric semiconductor properties, so that the wave-absorbing properties of the material can be improved; and 2) by use of the mesoporous foam silica as the hard template, and by means of the ultra-large hole size and a three-dimensional connected special structure of the mesoporous silica foam material, the ordered multi-element mesoporous metal oxide is obtained, and 3) the multi-element mesoporous metal oxide obtained by the hard template method has crystalline hole walls, and the crystallinity is improved by increasing of the heat treatment temperature.

Description

technical field [0001] The invention relates to a method for preparing a multi-component mesoporous metal oxide, in particular to a method for preparing a multi-component mesoporous metal oxide through a hard template. Background technique [0002] Multi-element metal oxide materials are oxide materials composed of two or more metal elements. Because of its unique physical and chemical characteristics, it has ferroelectric, electromagnetic, piezoelectric, dielectric and other semiconductor properties, and is widely used in electronics, catalysis, photoelectric conversion, environmental purification, fuel cells and other industries. Due to the mesoporous channel structure of the mesoporous multi-element metal oxide material, some functions of the original material can be improved. [0003] 200710036694.4 disclosed a method of one-time vacuum infusion synthesis of metal oxide mesoporous materials: using mesoporous silicon / mesoporous carbon as a hard template, after high vacuu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34
Inventor 胡敏刚
Owner 苏州远略知识产权运营有限公司
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