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Method for preparing MnOx-CeO2-graphene aerogel catalyst material

A graphene aerogel, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of improving dispersibility, improving catalytic efficiency, and large specific surface area

Inactive Publication Date: 2019-05-21
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This catalyst material can effectively solve the defects of single-component materials, thereby greatly improving the catalytic efficiency

Method used

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  • Method for preparing MnOx-CeO2-graphene aerogel catalyst material
  • Method for preparing MnOx-CeO2-graphene aerogel catalyst material

Examples

Experimental program
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example 1

[0030] In a beaker, 40 mg graphene oxide (GO) is uniformly dispersed in 10 ml of deionized water during stirring, and after stirring at room temperature, a 4 mg / ml graphene oxide aqueous solution is obtained, and ammonia water is added dropwise to the graphene oxide aqueous solution to make the pH reach 10, stir at room temperature to make it completely mixed to obtain mixed solution A. Take another beaker and add 10ml of deionized water, add 12mg of manganese nitrate and 28mg of cerium nitrate hexahydrate in the deionized water (the molar ratio of Mn:Ce is 1:1, the total addition mass of manganese salt and cerium salt is related to the oxidation The mass ratio of graphene is 1:1), and the mixed solution B is obtained after stirring evenly. Add solution B to solution A dropwise, stir at room temperature at 1000 rpm for 2 hours, and ultrasonically disperse at a frequency of 120 kHz for 50 minutes to obtain a mixed dispersion. Pour the dispersion liquid into the liner of the hy...

example 2

[0033] In a beaker, 50 mg graphene oxide (GO) is uniformly dispersed in 10 ml of deionized water during stirring, and after stirring at room temperature, a 5 mg / ml graphene oxide aqueous solution is obtained, and ammonia water is added dropwise to the graphene oxide aqueous solution to make the pH reach 10, stir at room temperature to make it completely mixed to obtain mixed solution A. Take another beaker and add 10ml of deionized water, and add 9mg of manganese chloride tetrahydrate and 41mg of cerium nitrate hexahydrate into the deionized water (the molar ratio of Mn:Ce is 1:2, and the manganese salt and cerium salt are added together. The ratio of the mass to the mass of graphene oxide is 1:1), and the mixed solution B is obtained after stirring evenly. Add solution B to solution A dropwise, stir at room temperature at 900 rpm for 2.5 hours, and ultrasonically disperse at a frequency of 110 kHz for 40 minutes to obtain a mixed dispersion. Pour the dispersion liquid into t...

example 3

[0036] In a beaker, 60 mg graphene oxide (GO) is uniformly dispersed in 10 ml of deionized water during stirring, and after stirring at room temperature, a 6 mg / ml graphene oxide aqueous solution is obtained, and ammonia water is added dropwise to the graphene oxide aqueous solution to make the pH Reach 11, stir at room temperature, make it mix completely, obtain mixed solution A. Get another beaker and add 10ml of deionized water, add 14mg of manganese nitrate and 106mg of cerium chloride heptahydrate in the deionized water (the mol ratio of Mn:Ce is 1:4, the total addition quality of manganese salt and cerium salt is equal to The mass ratio of graphene oxide is 2:1), and the mixed solution B is obtained after stirring evenly. Add solution B to solution A dropwise, stir at room temperature at 800 rpm for 3 hours, and ultrasonically disperse at a frequency of 100 kHz for 35 minutes to obtain a mixed dispersion. Pour the dispersion liquid into the liner of the hydrothermal rea...

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Abstract

The invention relates to a method for preparing a MnOx-CeO2-graphene aerogel catalyst material. The MnOx-CeO2-graphene aerogel composite material with an excellent and efficient catalytic performanceis prepared by compounding a rare earth oxide CeO2 and a transition metal oxide MnOx with graphene aerogel through sol-gel technology by using a hydrothermal reduction process or a chemical reductionprocess. The loading of nano-oxide particles improves the agglomeration between graphene layers, and the graphene aerogel used as a carrier provides many catalytic active sites for the active components and improves the dispersibility of active oxide nanoparticles in order to make the active components in sufficient contact with reactants. The catalyst material can effectively solve the defects ofsingle-component materials in order to greatly improve the catalytic efficiency. The prepared MnOx-CeO2 / graphene aerogel catalyst material has a specific surface area of 119-145 m<2> / g and a NO catalytic conversion rate of 89-99%.

Description

technical field [0001] The invention belongs to the field of preparation technology of nanoporous materials, and relates to a kind of MnO with hydrophobicity, low density, high specific surface area and catalytic activity x -CeO 2 -The preparation method of graphene airgel catalyst material. Background technique [0002] A large number of studies have proved that Mn-Ce oxides can provide electrons at low temperatures, and oxides of different valence states can be transformed into each other during the reaction process, which is beneficial to the redox reaction. However, due to the fact that oxide nanoparticles are easy to aggregate and accumulate, and their specific surface area is small, the catalytic efficiency is not high. Airgel material is the man-made substance with the lowest density known in the world, known as "solid smog". In addition to extremely low apparent density, aerogels are also characterized by high porosity, extremely low thermal conductivity, and larg...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J37/10B01J35/10
Inventor 朱昆萌刘思佳沈晓冬肖先锋崔升沈岳松
Owner NANJING UNIV OF TECH
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