Preparation method for mesoporous multi-element metal oxide

A multi-metal and oxide technology, applied in the field of mesoporous materials, can solve the problem of high price of surfactants

Inactive Publication Date: 2015-03-25
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, KLE3739 surfactant is expensive and has not been widely used, an

Method used

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  • Preparation method for mesoporous multi-element metal oxide
  • Preparation method for mesoporous multi-element metal oxide
  • Preparation method for mesoporous multi-element metal oxide

Examples

Experimental program
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Embodiment 1

[0038] Embodiment 1 A kind of mesoporous multi-element metal oxide BaTiO 3 preparation method

[0039] 1) Dissolve 0.02mol tetrabutyl titanate in ethanol, and dissolve 0.03mol BaCO 3 Dissolve in acetic acid solution, mix the two solutions to get mixed solution E;

[0040] 2) Add surfactant P123 to mixed solution E, stir evenly to obtain solution F;

[0041] 3) Evaporate solution F to dryness in an oven at 40°C for 24 hours to obtain a solid mixture;

[0042] 4) roasting the solid mixture at a temperature of 550° C. for 3 hours;

[0043] 5) The roasted samples were treated with HNO 3 Treatment to remove excess BaCO 3 , to obtain the target product mesoporous multi-metal oxide BaTiO3 , named MBT-1.5.

[0044] MBT-1.5 was tested by X-ray diffraction and nitrogen absorption and desorption, the results are as follows figure 1 and 2 as shown, figure 1 The diffraction peaks in all correspond to BaTiO 3 The characteristic diffraction peaks (JCPDS No.75-0213) are determined b...

Embodiment 2

[0045] Embodiment 2 A kind of mesoporous multi-element metal oxide SrTiO 3 preparation method

[0046] 1) 0.02mol tetrabutyl titanate was dissolved in ethanol, 0.04mol SrCO 3 Dissolve in acetic acid solution, mix the two solutions to get mixed solution E;

[0047] 2) Add 0.03 mol of citric acid as a surfactant into the mixed solution E, and stir evenly to obtain solution F;

[0048] 3) Evaporate solution F to dryness in an oven at 40°C for 24 hours to obtain a solid mixture;

[0049] 4) roasting the solid mixture at a temperature of 550° C. for 3 hours;

[0050] 5) The roasted samples were treated with HNO 3 Treatment to remove excess SrCO 3 , to obtain the target product mesoporous multi-metal oxide SrTiO 3 , named MST-2.

[0051] Carry out TG-DTA test to step 4) in solid mixture, result is as follows image 3 Shown is the weight loss and differential heat change of the sample during the heating and roasting process of the solid mixture in step 4), by image 3 It can...

Embodiment 3

[0055] Embodiment 3 A kind of mesoporous multi-element metal oxide SrTiO 3 preparation method

[0056] Method is the same as embodiment 2, just in step 1 with 0.02mol SrCO 3 Soluble in acetic acid solution.

[0057] Obtain the target product mesoporous multi-metal oxide SrTiO 3 , named MST-1.

[0058] The MST-1 was tested by nitrogen absorption and desorption, the results are as follows Figure 8 As shown in the figure, the adsorption and desorption curves of nitrogen in the figure do not overlap and there is a hysteresis loop, indicating that the synthesized MST-1 has a mesoporous structure, and the specific surface area of ​​MST-1 is 46m 2 / g, far less than the MST-2 prepared in Example 2.

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Abstract

The invention provides a preparation method for mesoporous multi-element metal oxide. The multi-element metal oxide has a representative formula of AxByOz, wherein A and B are metal elements. The preparation method comprises the following specific steps: (1) dissolving a precursor containing the element A in a solution C, dissolving a precursor containing the element B in a solution D, and mixing the two solutions to obtain a mixed solution E; (2) adding a chelating agent or a surfactant into the mixed solution E, and stirring to obtain a solution F; (3) evaporating the solution F to dryness at a certain temperature to obtain a solid mixture; (4) roasting the solid mixture at 300-1,400 DEG C for 1-20 hours; (5) washing a roasted sample to extract the target product-mesoporous multi-element metal oxide AxByOz. According to the preparation method, the pore collapse caused by over-crystallization of the pore wall of the mesoporous multi-element metal oxide in the roasting process can be prevented; the mesoporous multi-element metal oxide synthesized by the method is high in photocatalytic activity.

Description

technical field [0001] The invention relates to the field of mesoporous materials, in particular to a preparation method of mesoporous multi-element metal oxides. Background technique [0002] Mesoporous materials refer to porous materials with a pore size ranging from 2 to 50 nm. Because of the special structural characteristics of mesoporous materials, it has broad application prospects in catalysis, photoelectric conversion, adsorption, separation, etc., and is one of the hot issues in the fields of chemistry and materials research. [0003] With the in-depth study of mesoporous materials, people have turned their attention to mesoporous multi-component metal oxide materials. The reason is that in the functional materials that have been studied, the proportion of simple metal oxide materials is very small, compared with the vast majority of functional materials are multi-element metal oxide materials. However, the thermal stability of multi-element metal oxides is not i...

Claims

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Application Information

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IPC IPC(8): C01G23/00B01J23/02
CPCC01G23/006C01P2002/72C01P2004/03C01P2006/12
Inventor 范晓星金丹李思雨王绩伟宋鹏
Owner LIAONING UNIVERSITY
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