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Preparation method of CeO2-graphene aerogel catalyst material

A technology of graphene airgel and graphene hydrogel, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve high electron mobility and improve Effects of catalytic efficiency and high oxygen storage capacity

Inactive Publication Date: 2019-05-31
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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  • Preparation method of CeO2-graphene aerogel catalyst material
  • Preparation method of CeO2-graphene aerogel catalyst material

Examples

Experimental program
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Effect test

example 1

[0030] In the beaker, 40mg graphene oxide (GO) is uniformly dispersed in the deionized water of 10ml in the process of stirring, obtains the graphene oxide aqueous solution after stirring evenly at room temperature, drips ammoniacal liquor in the graphene oxide aqueous solution so that the pH reaches 10, Stir at room temperature to make it completely mixed to obtain a mixed solution A. Take another beaker and add 10ml of deionized water, add 40mg of cerium nitrate hexahydrate in the deionized water (the ratio of the mass of cerium salt added to the mass of graphene oxide is 1:1), and stir well to obtain a mixed solution B . 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 20 minutes to obtain a mixed dispersion. Pour the dispersion liquid into the liner of the hydrothermal reaction kettle, and conduct a hydrothermal reaction at 160°C for 15 hours to obtain CeO 2 - Graphene hydro...

example 2

[0033] In the beaker, 50mg graphene oxide (GO) is uniformly dispersed in the deionized water of 10ml in the process of stirring, and the graphene oxide aqueous solution is obtained after stirring at room temperature, ammoniacal liquor is added dropwise in the graphene oxide aqueous solution so that the pH reaches 10.5, Stir at room temperature to make it completely mixed to obtain a mixed solution A. Take another beaker and add 10ml of deionized water, add 50mg of cerium chloride heptahydrate into the deionized water (the ratio of the mass of cerium salt added to the mass of graphene oxide is 1:1), and stir well to obtain a mixed solution b. 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 30 minutes to obtain a mixed dispersion. Pour the dispersion liquid into the liner of the hydrothermal reaction kettle, and conduct a hydrothermal reaction at 170°C for 14 hours to obtain CeO ...

example 3

[0036]In the beaker, 60mg graphene oxide (GO) is uniformly dispersed in the deionized water of 10ml in the process of stirring, and after stirring at room temperature, the graphene oxide aqueous solution is obtained, and ammonia water is added dropwise in the graphene oxide aqueous solution so that the pH reaches 11, Stir at room temperature to make it completely mixed to obtain a mixed solution A. Take another beaker and add 10ml of deionized water, add 120mg of cerium nitrate hexahydrate into the deionized water (the ratio of the mass of cerium salt added to the mass of graphene oxide is 2:1), and stir well to obtain a mixed solution B . 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 reaction kettle, and conduct a hydrothermal reaction at 175°C for 13 hours to obtain CeO 2 -...

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Abstract

The invention discloses a preparation method of a CeO2-graphene aerogel catalyst material. Rare earth oxide CeO2 is compounded with graphene aerogel through a sol-gel process by adopting a hydrothermal reduction method or a chemical reduction method, and finally the CeO2-graphene aerogel composite material with excellent and efficient catalytic performance is prepared. Loading of nano oxide particles improves agglomeration between graphene sheet layers, and the graphene aerogel serves as a carrier, so that more catalytic active sites are provided for active components, the dispersibility of active oxide nano particles is improved, and the active components are in fully contact with reactants. By the catalyst material, the defect of a single-component material can be overcome effectively, so that the catalytic efficiency is greatly improved. The specific surface area of the prepared CeO2-graphene aerogel catalyst material is 138-187 m2 / g, and the catalytic conversion rate of NO is 86-95%.

Description

technical field [0001] The invention belongs to the field of preparation technology of nanoporous materials, and relates to CeO with hydrophobicity, low density, high specific surface area and catalytic activity 2 -The preparation method of graphene airgel catalyst material. Background technique [0002] Rare earth oxide CeO2 has been widely used in the field of catalysis due to its low band gap, low cost, good stability and non-toxicity. However, the agglomeration of cerium oxide particles limits its development. 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 large specific surface area. It has broad application prospects in many fields, such as heat insulation materials, sound insulation materials, optical devices, supercapacitors, etc. However, the high porosity of aerogels...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/10
Inventor 朱昆萌严文倩刘思佳沈晓冬崔升沈岳松
Owner NANJING UNIV OF TECH
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