Method for preparing single crystal perovskite type oxide and application thereof

A perovskite type and oxide technology, which is applied in chemical instruments and methods, catalyst activation/preparation, single crystal growth, etc., can solve the problem that the low-temperature catalytic activity of perovskite type catalysts cannot meet the requirements of industrial applications, and achieve low temperature Efficient cleaning and purification treatment, good low temperature activity, and good thermal stability

Inactive Publication Date: 2010-06-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the low-temperature catalytic activity of perovskite catalysts cannot meet the requirements of industrial applications, and proposes to directly obtain perovskite composite oxides by hydrothermal synthesis without high-temperature roasting

Method used

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  • Method for preparing single crystal perovskite type oxide and application thereof
  • Method for preparing single crystal perovskite type oxide and application thereof
  • Method for preparing single crystal perovskite type oxide and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 0.003mol KMnO 4 , 0.007mol Mn(CH 3 COOH) 2 4H 2 O, 0.005molLa(NO 3 ) 3 ·6H 2 O, 0.005mol Sr(NO 3 ) 2 Dissolve in 20ml of deionized water, stir mechanically for 30min; dissolve 0.56mol NaOH in 50ml of deionized water, slowly add dropwise to the metal salt solution for 100min, put the mixed solution in the ultrasonic wave, ultrasonically disperse for 1h, and then move it into the reaction kettle In 220 °C hydrothermal reaction for 72 hours, naturally cooled to room temperature, the obtained product was centrifuged three times with deionized water and absolute ethanol, dried at 80 °C for 24 hours, and ground to obtain a black powder that is a single crystal perovskite oxide.

Embodiment 2

[0021] 0.003mol KMnO 4 , 0.007mol Mn(CH 3 COOH) 2 4H 2 O, 0.005molLa(NO 3 ) 3 ·6H 2 O, 0.005mol Sr(NO 3 ) 2 Dissolve in 20ml of deionized water, stir mechanically for 40min; dissolve 0.7mol NaOH in 50ml of deionized water, slowly drop into the metal salt solution for 80min, put the mixed solution into the ultrasonic wave, ultrasonically disperse for 30min, and then move it into the reaction kettle In 230 °C hydrothermal reaction for 56 h, naturally cooled to room temperature, the obtained product was centrifuged three times with deionized water and absolute ethanol, dried at 80 °C for 24 h, and ground to obtain a black powder that is a single crystal perovskite type oxide.

Embodiment 3

[0023] 0.003mol KMnO 4 , 0.007mol Mn(CH 3 COOH) 2 4H 2 O, 0.005molLa(NO 3 ) 3 ·6H 2 O, 0.005mol Sr(NO 3 ) 2 Dissolve in 20ml of deionized water, stir mechanically for 50min; dissolve 0.84mol NaOH in 50ml of deionized water, slowly add dropwise to the metal salt solution for 70min, put the mixed solution in the ultrasonic wave, ultrasonically disperse for 20min, and then move it into the reaction kettle In 240 ° C hydrothermal reaction for 48 h, naturally cooled to room temperature, the obtained product was centrifuged three times with deionized water and absolute ethanol, dried at 80 ° C for 24 h, and ground to obtain a black powder that is a single crystal perovskite oxide.

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Abstract

The invention discloses a method for preparing single crystal perovskite type oxide and application thereof. The method comprises the following steps of: using NaOH as a mineralizer, slowly adding the NaOH solution into solution of metallic salt formed by MnO<4->, Mn<2+>, La<3+> and Sr<2>+ dropwise, and continuously mechanically stirring the mixed solution; placing the mixed solution in ultrasonic wave for ultrasonic dispersion, placing the mixed solution in a reaction kettle to perform a hydrothermal reaction at the temperature of between 220 and 270 DEG C, and naturally cooling the mixed solution to the room temperature; and centrifuging the obtained products by deionized water and absolute ethyl alcohol for three times respectively, drying the products at the temperature of 80 DEG C for 24 hours, and grinding the products to obtain the cube-shaped single crystal perovskite type oxide of La0.5Sr0.5MnO3-delta. The catalyst of the single crystal perovskite type oxide has the advantages of high low-temperature catalytic activity, stable structure, high thermal-shock resistance and no high-temperature roasting; and the single crystal perovskite type oxide is also suitable for the treatment of the low-concentration toluene and the effective treatment of environmental pollution, particularly the catalytic combustion of the toluene at a high space velocity.

Description

technical field [0001] The invention relates to the preparation of a low-cost and high-efficiency single-crystal perovskite oxide for purifying toluene and its application in catalytic combustion. Background technique [0002] Volatile organic compounds (VOCs) are one of the main sources of air pollution, including aromatic hydrocarbons, alcohols, aldehydes, and halogenated hydrocarbons, mainly produced in chemical and petrochemical waste gases, petroleum, chemical product storage tank gas, printing And paint production exhaust gas, wood carbonization exhaust gas and pharmaceutical factory exhaust gas, etc. These volatile organic waste gases pollute the environment, and can also react with nitrogen oxides in the air to form photochemical smog, which seriously endangers human health and must be purified. [0003] The catalytic combustion method is considered to be one of the treatment processes that can eliminate organic waste gases (VOCs), is environmentally friendly, has l...

Claims

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Application Information

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IPC IPC(8): C30B29/22B01J23/24B01J37/10
Inventor 余林史利涛孙明李永峰麦荣坚
Owner GUANGDONG UNIV OF TECH
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