Method for preparing colloid crystal template of orthorhombic La2CuO4 with three-dimensional macro-porous structure

A pore structure and template method technology, applied in chemical instruments and methods, copper compounds, inorganic chemistry, etc., can solve the problems of inability to prepare, difficult to prepare porous perovskite-like oxides, etc., and achieve good catalytic activity, pore size, etc. The effect of controllable size and cheap raw materials

Inactive Publication Date: 2010-08-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for preparing colloid crystal template of orthorhombic La2CuO4 with three-dimensional macro-porous structure
  • Method for preparing colloid crystal template of orthorhombic La2CuO4 with three-dimensional macro-porous 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 method for preparing a colloid crystal template of orthorhombic La2CuO4 with a three-dimensional macro-porous structure, which is characterized in that: lemon acid, lanthanum nitrate and copper nitrate are dissolved into ethylene glycol (wherein the mol ratio of lanthanum nitrate and the copper nitrate is 2:1, total mole ratio of metal salt: mol ratio of lemon acid= 1:1.2, and lemon acid, lanthanum nitrate and copper nitrate are added into ethylene glycol, so total mol concentration of the metal salt is 1.48 mol / L), mixed solution of methanol and ethylene glycol is added after being mixed for two hours by magnetic force under the atmospheric temperature, the mixed solution is poured into a beaker which is provided with PMMA (total mass of metal salt: PMMA mass= 2.73: 1) template to steep the template for 5 hours, and in the final prepared solution, the volume percentage content of ethylene glycol is 68 percent. After being filtered and dried under the room temperature for 12 hours, the prepared solid powder is arranged into a tubular furnace, the temperature is increased to 700 DEG C at a speed of 1 DEG C / min in the nitrogen atmosphere, the temperature of 700 DEG C is maintained for 4 hours, after the temperature is decreased to 50 DEG C, the nitrogen atmosphere is changed to the air atmosphere, then the temperature is increased to 300 DEG C at a speed of 1 DEG C / min, the temperature of 300 DEG C is maintained for 3 hours, then the temperature is continued to increase to 800 DEG C, the temperature of 800 DEG C is maintained for 5 hours, and the perovskite-like oxide La2CuO4 with a three-dimensional orderly macro-porous or three-dimensional vermiform macro-porous structure can be prepared. The La2CuO4 material which is prepared with the method belongs to the field of the material chemistry, has the characteristics of the porous structure and good catalyzing activity.

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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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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