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A three-dimensional ordered mesoporous manganese-cerium composite oxide catalyst and its preparation method and application

A composite oxide, three-dimensional ordered technology, applied in the field of catalysis, can solve the problems of extra fuel consumption, poisonous vanadium-based catalysts, adverse effects of operators and the environment, and achieve improved low-temperature activity and stability, excellent low-temperature, and enhanced oxidation The effect of restoring power

Active Publication Date: 2019-12-06
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional V for removal of CVOCs 2 o 5 / TiO 2 Catalyst, the activation temperature is about 300-350°C, not only need to consume extra fuel, but also the vanadium-based catalyst is poisonous, which will have adverse effects on operators and the environment

Method used

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  • A three-dimensional ordered mesoporous manganese-cerium composite oxide catalyst and its preparation method and application
  • A three-dimensional ordered mesoporous manganese-cerium composite oxide catalyst and its preparation method and application
  • A three-dimensional ordered mesoporous manganese-cerium composite oxide catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A three-dimensional ordered mesoporous MnO x / CeO 2 Catalyst, its preparation method comprises the steps:

[0042]1) Mix 217g of deionized water and 11.8g of hydrochloric acid (35wt%) to prepare a hydrochloric acid solution, dissolve 6.0g of P123 in the prepared hydrochloric acid solution, then add 6.0g of n-butanol and 12.9g of ethyl orthosilicate, 35 After stirring in a water bath at ℃ for 24 hours, transfer it to a hydrothermal reaction kettle for hydrothermal reaction at 100 ℃ for 24 hours, centrifuge, wash, dry at 80 ℃ for 12 hours, and calcinate at 550 ℃ for 5 hours to obtain three-dimensional ordered mesoporous SiO 2 ;

[0043] 2) Put 4.37g of cerium nitrate in 20ml of hydrated absolute ethanol, ultrasonically disperse evenly, and then add 1g of three-dimensional ordered mesoporous SiO 2 , stirred at room temperature for 3 hours, then evaporated to dry ethanol in a water bath at 60°C, dried at 80°C for 12 hours, and calcined at 300°C for 5 hours to obtain a pr...

Embodiment 2

[0053] A three-dimensional ordered mesoporous MnO x / CeO 2 Catalyst, its preparation method comprises the steps:

[0054] 1) Mix 325g of deionized water and 17.4g of hydrochloric acid (35wt%) to prepare a hydrochloric acid solution, dissolve 9.0g of P123 in the prepared hydrochloric acid solution, then add 9.0g of n-butanol and 19.35g of ethyl orthosilicate, 35 After stirring in a water bath at ℃ for 24 hours, transfer it to a hydrothermal reaction kettle for hydrothermal reaction at 100 ℃ for 24 hours, centrifuge, wash, dry at 80 ℃ for 12 hours, and calcinate at 550 ℃ for 5 hours to obtain three-dimensional ordered mesoporous SiO 2 ;;

[0055] 2) Put 4.7g of cerium nitrate in 20ml of absolute ethanol, ultrasonically disperse evenly, then add 1g of three-dimensional ordered mesoporous SiO 2 , stirred at room temperature for 3 hours, then evaporated to dry ethanol in a water bath at 70°C, dried at 80°C for 12 hours, and calcined at 300°C for 4 hours to obtain a primary impre...

Embodiment 3

[0062] A three-dimensional ordered mesoporous MnO x / CeO 2 Catalyst, its preparation method comprises the steps:

[0063] 1) Mix 144g of deionized water and 7.9g of hydrochloric acid (35wt%) to prepare a hydrochloric acid solution, dissolve 4.0g of P123 in the prepared hydrochloric acid solution, then add 4.0g of n-butanol and 8.6g of ethyl orthosilicate, 35 After stirring in a water bath at ℃ for 24 hours, transfer it to a hydrothermal reaction kettle for hydrothermal reaction at 100 ℃ for 24 hours, centrifuge, wash, dry at 80 ℃ for 12 hours, and calcinate at 550 ℃ for 5 hours to obtain three-dimensional ordered mesoporous SiO 2 ;

[0064] 2) Take 4.0g of cerium nitrate and place it in 20ml of absolute ethanol, disperse it evenly by ultrasonic, then add 1g of three-dimensional ordered mesoporous SiO 2 , stirred at room temperature for 3 hours, then evaporated to dry ethanol in a water bath at 60°C, dried at 80°C for 12 hours, and calcined at 300°C for 3 hours to obtain a p...

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Abstract

The invention relates to a three-dimensional orderly mesoporous manganese cerium composite oxide (MnOx / CeO2) catalyst, and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing three-dimensional orderly mesoporous SiO2; (2) duplicating by adopting the SiO2 as a template to obtain three-dimensional orderly mesoporous CeO2; and (3) by adopting CeO2 as a carrier, preparing the manganese cerium catalyst with a Mn / Ce molar ratio of 0.1 to 0.7 by adopting an isovolumetric impregnation method. The preparation method has the advantages that the prepared catalyst has rich three-dimensional double continuous mesoporous passages, the aperture distribution is 3 to 4 nm and 9 to 11 nm, the oxidation and reduction capacity of the catalyst is high, the low-temperature activity is high, and the temperature for completely catalyzing the burning of chlorobenzene is 279 DEG C; and the catalyst is nontoxic, the involved raw materials are cheap and easy to obtain, and the preparation method is simple, suitable for preparing various orderly mesporous metal oxides and easy to popularize and use.

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to a three-dimensional ordered mesoporous manganese-cerium composite oxide catalyst and its preparation method and application. Background technique [0002] In recent years, my country's economy has developed rapidly, and the total amount of industry has also increased day by day. The environmental pollution problems caused by it have also attracted more and more attention from the country, such as air pollution, including chlorinated volatile organic pollutants (CVOCs), and dioxins. Represented by Ying, it is highly toxic, bioaccumulative, carcinogenic and teratogenic to organisms, can cause photochemical smog and destroy the ozone layer when it enters the atmosphere, and is an important precursor of smog. One of the important gas pollutants. Technologies suitable for eliminating CVOCs mainly include: biological treatment technology, corona technology, photocatalytic oxidation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34F23G7/07
CPCB01J23/34F23G7/07F23G2202/60F23G2209/142
Inventor 刘善堂吴利瑶何霏
Owner WUHAN INSTITUTE OF TECHNOLOGY