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Preparation method of three-dimensional ordered macroporous La1-xSrxCrO3 with mesoporous pore wall

A technology with three-dimensional order and hole walls, which is applied to ceramic products, household utensils, and other household utensils, etc., to achieve huge application prospects, easy access to raw materials, and good thermal stability of products

Inactive Publication Date: 2011-05-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, domestic and foreign literatures and patents have not reported the use of surfactants and citric acid-assisted hard template method to prepare single-phase orthorhombic La with regular three-dimensional ordered macroporous structure with mesoporous walls. 1-x Sr x CrO 3 (x=0,0.4)

Method used

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  • Preparation method of three-dimensional ordered macroporous La1-xSrxCrO3 with mesoporous pore wall
  • Preparation method of three-dimensional ordered macroporous La1-xSrxCrO3 with mesoporous pore wall
  • Preparation method of three-dimensional ordered macroporous La1-xSrxCrO3 with mesoporous pore wall

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1: take by weighing 12.99g La(NO 3 ) 3 ·6H 2 O and 12.01g Cr(NO 3 ) 3 9H 2 O, put in a 50mL beaker, add 3.0mL polyethylene glycol 400 and 5.0mL anhydrous methanol, and magnetically stir to form a uniform precursor salt solution; add 0.03mol citric acid to it and ultrasonically disperse for 5min; weigh 1.0g three Block copolymer P123 was placed in a 50mL beaker, 10mL of anhydrous methanol was added, and after magnetic stirring for 1h, it was added to the above precursor salt solution, and ultrasonic dispersion was continued for 5min; finally, anhydrous methanol was added to make the whole solution system volume as 30mL, and continue to implement magnetic stirring for 4h; pour the above mixed solution into a 50mL beaker equipped with 1.0g PMMA hard template, in order to maintain the original orderly arrangement of PMMA, do not stir during the pouring process of the mixed solution; After impregnating PMMA for 5 h, suction filtration was performed, and the o...

Embodiment 2

[0017] Embodiment 2: take by weighing 7.79g La(NO 3 ) 3 ·6H 2 O, 2.54g Sr(NO 3 ) 2 and 12.01g Cr(NO 3 ) 3 9H 2 O, put in a 50mL beaker, add 3.0mL polyethylene glycol 400, 5.0mL anhydrous methanol and 5.0mL deionized water, magnetically stir to form a uniform precursor salt solution, add 0.03mol citric acid to it and then ultrasonically disperse 5min; Weigh 1.0g triblock copolymer P123 into a 50mL beaker, add 3.0mL anhydrous methanol and 2.0mL deionized water, stir magnetically for 1h, add it to the above precursor salt solution, and continue ultrasonic dispersion for 5min , finally add deionized water to make the whole solution system volume 30mL, and continue to implement magnetic stirring for 4h; the above-mentioned mixed solution is poured in the 50mL beaker that 1.0g PMMA hard template is housed, in order to keep the original orderly arrangement of PMMA, The mixed solution was poured without stirring; the mixed solution was impregnated with PMMA for 5 h and then fil...

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PUM

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Abstract

The invention discloses a preparation method of three-dimensional ordered macroporous La1-xSrxCrO3 (x=0, 0.4) with a mesoporous pore wall. The preparation method comprises the following steps of: dissolving lanthanum nitrate and chromium nitrate in mixed liquid of polyethylene glycol 400 and absolute methanol in the molar ratio of 1:1 or dissolving lanthanum nitrate, strontium nitrate and chromium nitrate in mixed liquid of polyethylene glycol 400, absolute methanol and deionized water in the molar ratio of 0.6:0.4:1; adding citric acid in the molar ratio of 1:1 of chromium nitrate to citric acid; performing ultrasonic treatment; adding absolute methanol solution of P123 and performing ultrasonic treatment so as to form homogeneous solution; adjusting metal ion concentration to be 2.0 mol / L; and pouring a polymethyl methacrylate (PMMA) microsphere template into the solution, soaking, performing suction filtration, drying and baking the obtained substance in two steps. The La1-xSrxCrO3prepared by the preparation method has high degree of crystallization, controllable particle shape and pore size, readily available raw materials, high product stability, high electrical conductivityand good application prospect.

Description

technical field [0001] The invention relates to a method for preparing a three-dimensional ordered macroporous perovskite oxide with mesoporous walls, in particular to the preparation of mesoporous perovskite oxides with mesoporous walls by a hard template method assisted by surfactant P123 and citric acid Three-dimensional ordered macroporous perovskite oxide La 1-x Sr x CrO 3 The method of (x=0, 0.4) belongs to the field of synthesis of nanometer functional materials. Background technique [0002] Volatile organic compounds (VOCs) pollute the atmospheric environment, and catalytic oxidation is the most effective means of treating VOCs. Perovskite oxides (ABO 3 ) is an ideal catalytic material for the oxidation of VOCs, where La 1-x Sr x MO 3 (M=Cr, Mn, Co) is the best. will ABO 3 Made of macroporous / mesoporous materials, the specific surface area can be increased. Its three-dimensional structure allows substances to enter the pores from all directions, reduces the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C04B38/00
Inventor 戴洪兴吉科猛刘雨溪张磊许慧超单玲珑陈若林
Owner BEIJING UNIV OF TECH
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