Polyethylene glycol and citric acid auxiliary template method of three-dimensional ordered macroporous and chain LaMnO3

A three-dimensional ordered, colloidal crystal template technology, applied in the direction of manganate/permanganate, etc., to achieve good application prospects, good catalytic activity, and cheap raw materials

Inactive Publication Date: 2010-10-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, no literature or patent has reported the preparation of perovskite-type oxide LaMnO with a three-dimensional ordered macroporous structure and monodisperse chain-like structure using a two-step calcination method. 3

Method used

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  • Polyethylene glycol and citric acid auxiliary template method of three-dimensional ordered macroporous and chain LaMnO3
  • Polyethylene glycol and citric acid auxiliary template method of three-dimensional ordered macroporous and chain LaMnO3

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: take by weighing 12.99gLa (NO 3 ) 3 ·6H 2 O and 8.32ml mass fraction are 50% Mn(NO 3 ) 2The aqueous solution was placed in a 50 mL beaker, 3 mL of polyethylene glycol 400 was added, and after 4 hours of magnetic stirring, a homogeneous solution was formed, and then 14 mL of methanol (46% by volume of methanol) was added. The above mixture was poured into a 50 mL beaker containing 1 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. After the mixture was impregnated with PMMA for about 5 hours, the sample obtained by suction filtration 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 (20mL / min), the temperature was raised from room temperature to 500°C at a rate of 1°C / min and kept at this temperature for 3 hours. The rate of min is increased to 7...

Embodiment 2

[0019] Embodiment 2: take by weighing 15.16g La(NO 3 ) 3 ·6H 2 O, 8.4g citric acid and 9.67ml mass fraction are 50% Mn(NO 3 ) 2 The aqueous solution was placed in a 50 mL beaker, 5 mL of ethylene glycol was added, and after magnetic stirring for 4 hours, a uniform solution was formed, and then 13 mL of methanol (36% by volume of methanol) was added. The above mixture was poured into a 50mL beaker filled with 1g PMMA. In order to keep the original orderly arrangement of PMMA, do not stir during the pouring process of this mixed solution. After the mixture was soaked in PMMA for about 5 hours, the sample obtained by suction filtration 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 (20mL / min), the temperature was raised from room temperature to 500°C at a rate of 1°C / min and kept at this temperature for 3 hours. The rate of min increased to 750 °C and kept at this temperatu...

Embodiment 3

[0020] Embodiment 3: take by weighing 12.99g La(NO 3 ) 3 ·6H 2 O and 8.32ml mass fraction are 50% Mn(NO 3 ) 2 The aqueous solution was placed in a 50 mL beaker, 5 mL of polyethylene glycol 400 was added, and after magnetic stirring for 4 hours, a homogeneous solution was formed, and then 12 mL of methanol (40% by volume of methanol) was added. The above mixture was poured into a 50mL beaker filled with 1g PMMA. In order to keep the original orderly arrangement of PMMA, do not stir during the pouring process of this mixed solution. After the mixture was impregnated with PMMA for about 5 hours, the sample obtained by suction filtration 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 (20mL / min), the temperature was raised from room temperature to 500°C at a rate of 1°C / min and kept at this temperature for 3 hours. The rate of min increased to 750°C and kept at this temperatu...

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Abstract

The invention discloses a polyethylene glycol and citric acid auxiliary template method of three-dimensional ordered macroporous and chain LaMnO3. The method comprises the following steps: dissolving lanthanum nitrate and Mn(NO3)2 into polyethylene glycol 400, wherein, 1mL of polyethylene glycol is used in each 0.01mol of lanthanum nitrate; adding methanol, immersing PMMA, filtering and drying to obtain hexagonal macroporous LaMnO3 by a two-step roasting method; when 5mL of glycol is used in each 0.035mol of lanthanum nitrate, adding citric acid according to the mole ratio of total metal salt to citric acid of 1:0.6 to obtain quadrate macroporous LaMnO3 by the same method; and when 5mL of polyethylene glycol 400 is used in each 0.03mol of lanthanum nitrate, adopting the same method to obtain monodisperse chain LaMnO3. The auxiliary template method has cheap and available raw materials, simple preparation process, controllable particle shape and hole size of the product, and good catalytic activity.

Description

technical field [0001] The present invention relates to a method for preparing perovskite oxides with three-dimensional ordered macropore structure and monodisperse chain structure, in particular to the preparation of calcium oxide with three-dimensional ordered macropore and monodisperse chain structure using colloidal crystals as templates. Titanium oxide LaMnO 3 Methods. Background technique [0002] The development of modern industry has brought pollution to the environment while improving our life. Industrial waste gas (volatile organic compounds VOCs, etc.) is the main source of air pollution. Among the VOCs pollution control technologies, catalytic combustion is currently the most commonly used removal technology. With the help of catalysis, VOCs can be burned at lower temperatures (<500°C), and the removal rate is usually higher than 95%. In catalytic combustion, the choice of catalyst is particularly critical. At present, the types of catalysts used in the ca...

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何洪
Owner BEIJING UNIV OF TECH
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