Three dimensional ordered macroporous structure Ag micrometer beam/Eu0.6Sr0.4FeO3 composite catalyst, its preparation and its application

A eu0.6sr0.4feo3, composite catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, incinerators, etc., can solve the problems of no literature and patent reports, and achieve enhanced The dispersion effect and the effect of

Inactive Publication Date: 2012-10-17
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although there are a variety of preparation methods for the preparation of three-dimensional ordered macroporous catalysts for heterogeneous catalytic oxidation and reports on silver nanoparticles, so far, there are no lite

Method used

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  • Three dimensional ordered macroporous structure Ag micrometer beam/Eu0.6Sr0.4FeO3 composite catalyst, its preparation and its application
  • Three dimensional ordered macroporous structure Ag micrometer beam/Eu0.6Sr0.4FeO3 composite catalyst, its preparation and its application
  • Three dimensional ordered macroporous structure Ag micrometer beam/Eu0.6Sr0.4FeO3 composite catalyst, its preparation and its application

Examples

Experimental program
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Embodiment 1

[0019] Embodiment 1: 1. prepare the silver nitrate solution of 5mmol / L: weigh 0.3398g AgNO 3 Dissolve in 50mL deionized water, stir well to dissolve, add 0.3330g polyvinylpyrrolidone (PVP), adjust the volume of the solution to about 80mL, and finally adjust the pH value of the solution system with NaOH solution with a concentration of 0.1mol / L 8~9, and dilute to 400mL with deionized water; ②Prepare 20mmol / L NaBH 4 Reduction solution: 0.1515g NaBH 4 Fully dissolved in 200mL deionized water; ③Ultrasonic-assisted membrane reduction method (UAMR method) to prepare the three-dimensional ordered macroporous structure Eu loaded with bundled Ag 0.6 Sr 0.4 FeO 3 : Take the AgNO prepared in ① 3 Dilute 4.64mL of dilute solution to 200mL, weigh 0.25g Eu 0.6 Sr 0.4 FeO 3 The catalyst is impregnated in it, take the NaBH prepared in ② 4 2.32mL of the dilute solution was diluted to 200mL, and then the beakers containing the two solutions were respectively placed in the corresponding p...

Embodiment 2

[0020] Embodiment 2: other steps and implementation method are the same as embodiment 1, only in step 3.: get AgNO 3 Dilute 27.81mL of dilute solution to 200mL, weigh 0.50g Eu 0.6 Sr 0.4 FeO 3 The catalyst is impregnated in it, and the prepared NaBH 4 13.91mL of dilute solution was diluted to 200mL. At this point, Ag microbeams / Eu with a theoretical loading of 3wt% 0.6 Sr 0.4 FeO 3 supported catalyst. The particle size of Ag particles prepared in this example is about 1nm, and the supported catalyst exhibits a pure perovskite crystal structure, and Ag nanoparticles are aggregated into bundles and distributed on the surface of the carrier. The diameter of each bundle is about 100nm, and the length is about 500~1500nm, the obtained three-dimensional ordered macroporous structure 3wt%Ag micro beam / Eu 0.6 Sr 0.4 FeO 3 The catalytic activity test result of catalyst to toluene shows that its T 50% and T 90% are about 254°C and 296°C respectively, while Eu 0.6 Sr 0.4 Fe...

Embodiment 3

[0021] Embodiment 3: other steps and implementation method are the same as embodiment 1, only in step 3.: get AgNO 3 Dilute 23.18mL of dilute solution to 200mL, weigh 0.25g Eu 0.6 Sr 0.4 FeO 3 The catalyst is impregnated in it, and the prepared NaBH 4 11.59mL of dilute solution was diluted to 200mL. At this point, Ag microbeams / Eu with a loading of 5wt% were obtained 0.6 Sr 0.4 FeO 3 supported catalyst. The particle size of Ag particles prepared in this example is about 1nm, and the supported catalyst exhibits a pure perovskite crystal structure. 0.6 Sr 0.4 FeO 3 The comparison of the electron microscope photos shows that the Ag material may be loaded on the surface of the procatalyst pore channel, because the prepared Ag particles are very small, and the distribution state of a single Ag particle cannot be determined. 0.6 Sr 0.4 FeO 3 The catalyst is still polycrystalline, and the catalytic activity test result to toluene shows that its T 50% and T 90% are about...

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Abstract

The invention relates to a three dimensional ordered macroporous structure Ag micrometer beam/Eu0.6Sr0.4FeO3 composite catalyst, its preparation and its application, which belongs to the composite catalyst technical field. Ag nanoparticles is aggregated to a micrometer bundles and loaded on a carrier Eu0.6Sr0.4FeO3 surface, the composite catalyst presents a pure perovskite phase. A 1mmol/L-5mmol/L AgNO3 solution is prepared according to mol ratio of 2:3 of AgNO3 to PVP constitutional unit, the pH value can be regulated to 8-9; a NaBH4 solution is prepared, wherein the AgNO3 concentration accounts for 1/2 of NaBH4 concentration; 3DOM Eu0.6Sr0.4FeO3 is immersed in the AgNO3 solution, AgNO3 and NaBH4 is added in the NaBH4 solution according to mol ratio of 1:2; a super ultrasonic wave auxiliary membrane reduction method is employed for connecting two solutions in a tubular type membrane reactor with nanometer Ag sol generated by reaction, and filtered and dried under the room temperature after the reaction is completed to obtain the catalyst. The loaded sample presents more excellent catalysis performance on the toluene oxidation reaction.

Description

technical field [0001] The invention relates to a supported composite catalyst Ag microbeam / Eu with a three-dimensional ordered macroporous structure 0.6 Sr 0.4 FeO 3 , the perovskite-type composite oxide Eu with three-dimensional ordered macroporous structure loaded with Ag microbeams was prepared in situ by ultrasonic-assisted membrane reduction method. 0.6 Sr 0.4 FeO 3 The preparation method of the invention and its application in catalytic combustion to eliminate volatile organic pollutants (VOCs) belong to the technical field of composite catalysts. Background technique [0002] Catalytic oxidation is one of the most effective means of controlling environmental pollution gas-volatile organic compounds (VOCs). Perovskite oxide (ABO 3 ) is a class of compounds that can be isomorphously substituted by heterovalent ions at both the A and B cation positions. Its superior thermal stability, rich structural defects, and B-site transition metal ions with various oxidation...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/10F23G7/07
Inventor 戴洪兴吉科猛邓积光李欣尉王媛
Owner BEIJING UNIV OF TECH
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