New method for preparing polycrystalline SrFeO3 with three-dimensional ordered macroporous structure

A technology with three-dimensional order and pore structure, applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., to achieve the effects of good thermal stability of products, huge application prospects, and easy availability of raw materials

Inactive Publication Date: 2011-04-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, domestic and foreign literature and patents have not reported the preparation of polycrystalline SrFeO with a three-dimensional ordered macroporous structure by using a hard template method. 3

Method used

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  • New method for preparing polycrystalline SrFeO3 with three-dimensional ordered macroporous structure
  • New method for preparing polycrystalline SrFeO3 with three-dimensional ordered macroporous structure

Examples

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Embodiment 1

[0013] Example 1: Under stirring conditions, 0.015mol Sr(NO 3 ) 2 and 0.015mol Fe(NO 3 ) 3 9H 2 Dissolve O in 11mL deionized water, first add 3.6g citric acid, then add 0.72g lysine after it is completely dissolved, then add 1mL methanol, set the volume of the solution to 20mL, and keep stirring until a uniform metal ion complex is formed Solution; Weigh 2g PMMA microspheres as a hard template, slowly pour into the beaker containing the above mixed solution and soak for 12h, then suction filter, and dry the obtained sample at room temperature for more than 12h; finally put the sample into a magnetic boat and place it in a tube type furnace, first in N 2 Under the atmosphere, raise from room temperature to 600°C at a rate of 1°C / min and keep the temperature constant for 2 hours. After the temperature drops below 70°C, switch to air atmosphere, then raise it to 300°C at a rate of 1°C / min and keep the temperature constant for 1 hour, then Continue to raise the temperature to...

Embodiment 2

[0014] Example 2: Under stirring conditions, 0.015mol Sr(NO 3 )2 and 0.015mol Fe(NO 3 ) 3 9H 2 O was dissolved in 11mL of deionized water, and 3mL of ethylene glycol was added first, and then 3.6g of citric acid was added successively after the miscibility was complete, and the stirring was continued until a uniform metal ion complex solution was formed. At this time, the solution volume was 21mL; Methyl acrylate (PMMA) microspheres were used as a hard template, slowly poured into the beaker containing the above mixed solution and soaked for 12 hours, then suction filtered, and the obtained sample was dried at room temperature for more than 12 hours; finally, the sample was placed in a magnetic boat tube furnace, first in N 2 Under the atmosphere, raise from room temperature to 600°C at a rate of 1°C / min and keep the temperature constant for 2 hours. After the temperature drops below 70°C, switch to air atmosphere, then raise it to 300°C at a rate of 1°C / min and keep the te...

Embodiment 3

[0015] Embodiment 3: under stirring condition, 0.015mol Sr(NO 3 ) 2 and 0.015mol Fe(NO 3 ) 3 9H 2 O was dissolved in 10mL of deionized water, firstly added 3mL of ethylene glycol, and then added 3.6g of citric acid and 0.72g of sucrose successively after the miscibility was complete, and continued to stir until a uniform metal ion complex solution was formed. At this time, the volume of the solution was 20mL; Take 2g of PMMA microspheres as a hard template, slowly pour them into a beaker containing the above mixed solution and soak for 12 hours, then filter with suction, and dry the obtained sample at room temperature for more than 12 hours; finally put the sample into a magnetic boat and place it in a tube furnace , first at N 2 Under the atmosphere, raise from room temperature to 600°C at a rate of 1°C / min and keep the temperature constant for 2 hours. After the temperature drops below 70°C, switch to air atmosphere, then raise it to 300°C at a rate of 1°C / min and keep t...

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Abstract

The invention discloses a new method for preparing polycrystalline SrFeO3 with a three-dimensional ordered macroporous structure. The new method comprises the following steps of: dissolving strontium nitrate and iron nitrate in water according to the molar ratio of 1 to 1, adding citric acid to form complexing solution, and controlling metal ion concentration to be about 1.5mol/L, wherein an additive or a carbon source such as lysine, sugar or the like can be introduced into the solution; pouring a polymethyl methacrylate (PMMA) microsphere template into the solution, impregnating, performingsuction filtration and drying; placing the mixture into a tubular furnace; and heating to the temperature of 600 DEG C in a nitrogen atmosphere at the rate of 1 DEG C per minute, keeping the constanttemperature for 2 hours, switching to an air atmosphere after cooling to below 70 DEG C, heating to the temperature of 300 DEG C at the rate of 1 DEG C per minute, keeping the constant temperature for 1 hour, continuously heating to the temperature of 750 DEG C and keeping the constant temperature for 3 hours to obtain the perovskite type polycrystalline oxide SrFeO3 with the three-dimensional ordered macroporous structure. The prepared polycrystalline oxide SrFeO3 material with the three-dimensional ordered macroporous structure has the advantages of high crystallinity, cheap and readily available raw materials and high thermal stability of a product.

Description

technical field [0001] The present invention relates to a preparation method of a polycrystalline perovskite oxide with a three-dimensional ordered macroporous structure, in particular to the preparation of a polycrystalline perovskite oxide with a three-dimensional ordered macroporous structure by combining a citric acid complexation method with a hard template method. Crystalline perovskite oxide SrFeO 3 The method belongs to the field of synthesis of nano-micro functional materials. Background technique [0002] Since the 1950s, perovskite oxides (ABO 3 ) as a new type of catalytic material, due to its good thermal stability, rich structural defects and a variety of oxidation state metal ions, it shows good catalytic activity in oxidizing and eliminating pollutants such as organic matter and carbon monoxide, so it is used in catalytic combustion , automobile exhaust purification and flue gas desulfurization have attracted widespread attention. And because it is more co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 戴洪兴吉科猛张晗石凤娟张磊刘雨溪袁静邓积光
Owner BEIJING UNIV OF TECH
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