Method for preparing perovskite oxide LaMnO3 hollow spheres

A perovskite type, oxide technology, applied in the direction of manganate/permanganate, etc., to achieve the effect of easy availability of raw materials, simple preparation process and cheap raw materials

Inactive Publication Date: 2011-02-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, no literature and patents have reported the use of PMMA microspheres as hard templates and polyethylene glycol as additives to prepare perovskite oxides LaMnO 3 hollow ball

Method used

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  • Method for preparing perovskite oxide LaMnO3 hollow spheres
  • Method for preparing perovskite oxide LaMnO3 hollow spheres

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1: take by weighing 6.5g La(NO 3 ) 3 ·6H 2 O and 4.15 mL of 50% Mn(NO 3 ) 2 Put the aqueous solution in a beaker, add 3mL of polyethylene glycol 400, and stir magnetically for 4 hours to form a homogeneous solution, then add 18mL of methanol. This solution is the precursor solution. The above mixed solution was poured into a beaker equipped with 1.0 g polymethyl methacrylate (PMMA) microsphere hard template. In order to keep the original orderly arrangement of PMMA, do not stir during the pouring process of this mixed solution. After the mixed solution was impregnated with PMMA for about 5 hours, the solid obtained by suction filtration was dried at room temperature for 12 hours, and then the solid was loaded into a magnetic boat and placed in a tube furnace. 2 Under the atmosphere (20mL / min), the temperature was raised from room temperature to 300°C at a rate of 1°C / min and kept at this temperature for 3 hours. The rate of min rises to 750°C and is ke...

Embodiment 2

[0015] Embodiment 2: take by weighing 6.5g La(NO 3 ) 3 ·6H 2 O and 4.15 mL of 50% Mn(NO 3 ) 2 Put the aqueous solution in a beaker, add 5mL of polyethylene glycol 400, and stir magnetically for 4 hours to form a homogeneous solution, then add 16mL of methanol. This solution is the precursor solution. The above mixture was poured into a beaker containing 1.0 g of PMMA. In order to maintain the original orderly arrangement of PMMA, no stirring is performed during the pouring of the mixed solution. After the mixed solution was impregnated with PMMA for about 5 hours, the solid obtained by suction filtration was dried at room temperature for 12 hours, and then the solid was loaded into a magnetic boat and placed in a tube furnace. 2 Under the atmosphere (20mL / min), the temperature was raised from room temperature to 300°C at a rate of 1°C / min and kept at this temperature for 3 hours. The rate of min rises to 750°C and is kept at this temperature for 4h to obtain the perovsk...

Embodiment 3

[0016] Embodiment 3: take by weighing 6.5g La(NO 3 ) 3 ·6H 2 O and 4.15 mL of 50% Mn(NO 3 ) 2 Put the aqueous solution in a beaker, add 7mL of polyethylene glycol 400, and stir magnetically for 4 hours to form a homogeneous solution, then add 14mL of methanol. This solution is the precursor solution. The above mixture was poured into a beaker equipped with 1.0 g of PMMA hard template. In order to maintain the original orderly arrangement of PMMA, no stirring is performed during the pouring of the mixed solution. The mixed solution was impregnated with PMMA for about 5 hours, and the solid obtained by suction filtration was dried at room temperature for 24 hours, and then the solid was loaded into a magnetic boat and placed in a tube furnace. 2 Under the atmosphere (20mL / min), the temperature was raised from room temperature to 300°C at a rate of 1°C / min and kept at this temperature for 3 hours. The rate of min rises to 750°C and is kept at this temperature for 4h to obt...

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Abstract

The invention discloses a method for preparing perovskite oxide LaMnO3 hollow spheres, which comprises the following steps of: dissolving lanthanum nitrate hexahydrate and 50 mass percent aqueous solution of Mn(NO3)2 in a molar ratio of 1:1 into polyethylene glycol 400, wherein 2 to 6 milliliters of polyethylene glycol 400 is used in every 0.01 mol of lanthanum nitrate; and then adding methanol into the solution, pouring the mixed solution into a container filled with PMMA (polymethyl methacrylate) to fully wet the PMMA, suction filtering, drying at room temperature, filling the dried product into a magnetic boat, putting the magnetic boat into a tube furnace, heating the product to 300 DEG C from room temperature at the speed of 1 DEG C per minute under the atmosphere of N2 and keeping the temperature of 3 hours, cooling the product to 50 DEG C, then switching the atmosphere to air atmosphere, heating the product to 750 DEG C at the speed of 1 DEG C per minute and keeping the temperature for 4 hours. The method has the characteristics that the raw materials are cheap and easily obtained, the preparation process is simple, the particle morphology and the hole size of the product are controllable and the like.

Description

technical field [0001] The present invention relates to a method for preparing perovskite oxide hollow spheres, in particular to a method for preparing perovskite oxide LaMnO with polymethyl methacrylate (PMMA) as a hard template. 3 Hollow sphere method. Background technique [0002] Perovskite oxide hollow spheres have great application prospects in physical and chemical fields such as electricity, magnetism, adsorption, and catalysis due to their excellent properties such as light weight, high strength, and high specific surface area. [0003] At present, there are many preparation methods of hollow sphere structure compounds, which are mainly divided into two categories: template method and non-template method. The template method is divided into deposition and surface reaction method, layer-by-layer assembly method and microencapsulation method; non-template method is divided into droplet method, spray drying method and emulsion phase separation method. The preparation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12
Inventor 戴洪兴刘雨溪张磊邓积光蒋海燕张晗袁静石凤娟
Owner BEIJING UNIV OF TECH
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