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A colloidal crystal template method for preparing orthorhombic crystal phase la2cuo4 with three-dimensional macroporous structure

A technology of pore structure and colloid, which is applied in chemical instruments and methods, copper compounds, inorganic chemistry, etc., can solve the problems that it is difficult to prepare porous perovskite-type oxides, and can not be prepared, so as to achieve good catalytic activity, pore The effect of controllable size and cheap raw materials

Inactive Publication Date: 2011-12-21
BEIJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

Therefore, it is difficult to prepare porous perovskite-type oxides by this method
[0005] The perovskite-like oxides La with three-dimensional ordered macropores and three-dimensional worm-like macroporous structures cannot be prepared by the methods reported above. 2 CuO 4
So far, no literature or patent has reported the use of citric acid-assisted colloidal crystal template method to prepare perovskite-like oxide La with three-dimensional ordered macroporous structure or three-dimensional worm-like macroporous structure. 2 CuO 4

Method used

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  • A colloidal crystal template method for preparing orthorhombic crystal phase la2cuo4 with three-dimensional macroporous structure
  • A colloidal crystal template method for preparing orthorhombic crystal phase la2cuo4 with three-dimensional macroporous structure

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: take by weighing 2.1365g La(NO 3 ) 3 ·6H 2 O and 0.5960g Cu(NO 3 ) 2 ·3H 2 O, put in a 100mL beaker, add 5mL of ethylene glycol, stir magnetically for 1 hour, then add 20mL of ethylene glycol solution with a methanol volume percentage of 40%. The above mixed solution was poured into a 100 mL beaker containing 1.0095 g of polymethyl methacrylate (PMMA). In order to keep the original orderly arrangement of PMMA, do not stir during the pouring process of this mixed solution. The sample obtained after the mixture was soaked in PMMA for 5 h and filtered with suction was dried at room temperature for 12 h, and then the sample was loaded into a magnetic boat and raised from room temperature to 800 °C at a rate of 1 °C / min in a muffle furnace. Keeping it for 5h, the orthorhombic phase La with a three-dimensional wormhole structure is obtained 2 CuO 4 Particles (which contain a small amount of La 2 o 2 CO 3 heterogeneous phase), the pore size is between ...

Embodiment 2

[0019] Embodiment 2: take by weighing 2.1380g La(NO 3 ) 3 ·6H 2 O and 0.5980g Cu(NO 3 ) 2 ·3H 2 O and 1.9960 g of citric acid were placed in a 100 mL beaker, 5 mL of ethylene glycol was added, and after magnetic stirring for 1 h, 20 mL of ethylene glycol solution with a methanol volume percentage of 40% was added. The above mixture was poured into a 100mL beaker containing 1.0095g PMMA. In order to keep the original orderly arrangement of PMMA, do not stir during the pouring process of this mixed solution. The sample obtained after the mixture was impregnated with PMMA for about 5 hours and suction filtered was dried at room temperature for 12 hours. Keeping at temperature for 5h, the orthorhombic phase La with a three-dimensional wormhole structure is obtained 2 CuO 4 Particles (which contain a small amount of La 2 o 2 CO 3 heterogeneous phase), the pore size is between 67-93nm.

Embodiment 3

[0020] Embodiment 3: take by weighing 2.1364g La(NO 3 ) 3 ·6H 2 O and 0.5961g Cu(NO 3 ) 2 ·3H 2 O In a 100mL beaker, add 5mL of ethylene glycol, stir magnetically for 1h, then add 20mL of ethylene glycol solution with a methanol volume percentage of 40%, and pour the above mixed solution into a 100mL beaker containing 1.0126g of PMMA. 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 soaked in PMMA for about 5 hours and filtered with suction, the sample obtained was dried at room temperature for 12 hours, and then the sample was loaded into a magnetic boat and placed in a tube furnace. 2 Under the atmosphere, it was raised from room temperature to 700°C at a rate of 1°C / min and kept at this temperature for 4 hours. After the temperature dropped to 50°C, it was switched to an air atmosphere, and then raised to 300°C at a rate of 1°C / min. Keep at this temperature for 3h, th...

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Abstract

The invention discloses a citric acid-assisted colloidal crystal template method for preparing a three-dimensional macroporous structure La2CuO4. The method dissolves citric acid, lanthanum nitrate and copper nitrate in ethylene glycol (wherein lanthanum nitrate: the molar ratio of copper nitrate is 2: 1, the total molar number of metal salt: the molar number of citric acid is 1: 1.2, then Add ethylene glycol, make the molar concentration of total metal salt be 1.48mol / L), add the mixed solution of a certain amount of methyl alcohol and ethylene glycol after magnetic stirring 2h under normal temperature, then this mixed solution is poured into PMMA (total The quality of metal salt: the quality of PMMA=2.73:1) was immersed in the beaker of the template for 5h, and the volume percentage of ethylene glycol in the final solution was 68%. After suction filtration and drying at room temperature for 12 hours, the obtained solid powder was placed in a tube furnace, first raised to 700°C at a rate of 1°C / min in a nitrogen atmosphere and kept at this temperature for 4 hours, and then switched after the temperature dropped to 50°C into an air atmosphere, then raised to 300°C at a rate of 1°C / min and kept at this temperature for 3 hours, and then continued to heat up to 800°C and kept at this temperature for 5 hours, that is, three-dimensional ordered macropores or three-dimensional worm-like Perovskite-like oxide La2CuO4 with macroporous structure. The La2CuO4 material obtained by the invention belongs to the field of material chemistry, has the characteristics of porous structure and good catalytic activity, and has good application prospects in superconducting materials, photonic crystals, catalysts, separations, electrodes, electrolytes, thermal insulators and the like.

Description

technical field [0001] The invention relates to a method for preparing a three-dimensional macroporous structure La 2 CuO 4 The citric acid-assisted colloidal crystal template method, specifically relates to a perovskite-like oxide La 2 CuO 4 colloidal crystal templating method. Background technique [0002] With the depletion of coal and oil resources, the search for other energy sources has become a major issue that needs to be solved urgently. Natural gas is rich in underground reserves, and its main components are methane, ethane, propane, etc., of which the methane content is more than 90%. Natural gas is known as a "green fuel". At present, natural gas combustion generally adopts the traditional combustion method, and the combustion temperature is above 1500°C. At this high temperature, O in the air 2 and N 2 Easy to react and generate NO which seriously pollutes the environment x , At the same time, the incomplete combustion of methane will form the atmospheri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G3/00
Inventor 戴洪兴袁静赵振璇张汝珍刘雨溪张晗何洪
Owner BEIJING UNIV OF TECH
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