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A metastable cerium oxide or cerium-zirconium solid solution nano material

A technology of cerium-zirconium solid solution and nanomaterials, applied in the direction of catalyst supports, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of inability to form oxide crystals, etc., and achieve the promotion of oxygen Effects of activation, high activity, and improvement of supply capacity

Active Publication Date: 2019-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if it is not subjected to high temperature heat treatment, it will not be able to form a good oxide crystal form

Method used

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  • A metastable cerium oxide or cerium-zirconium solid solution nano material
  • A metastable cerium oxide or cerium-zirconium solid solution nano material
  • A metastable cerium oxide or cerium-zirconium solid solution nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 116.3 g of cerium acetylacetonate (12% Ce content) and 82 ml of xylene were mixed to prepare a precursor solution, and the concentration of the cerium precursor was 0.5 mol / L. The solution was placed on a magnetic stirrer and stirred until a clear solution was obtained. Use a syringe to pump the prepared solution into the flame at a rate of 5ml / min. The flame combustion gas is a mixture of methane (0.6L / min) and oxygen (1.9L / min), and the mixture is ejected from a nozzle with a diameter of 2mm. The gas distribution plate is used to blow a large amount of air (6L / min) into the flame area, driven by the high-speed air flow, the combustion products leave the flame area quickly, and the sum of the radial cross-sectional area of ​​the gas through holes on the gas distribution plate is 3.5 square meters cm, the temperature drops to 40°C when the sample reaches the glass fiber filter paper. Catalyst particles obtained by combustion were collected with glass fiber filter pape...

Embodiment 2

[0021] 65.4 g of cerium acetylacetonate (12% Ce content), 9.8 ml of zirconium acetylacetonate and 74 ml of xylene were mixed to prepare a precursor solution. The solution was placed on a magnetic stirrer and stirred until a clear solution was obtained. Use a syringe to pump the prepared solution into the flame at a rate of 5ml / min. The flame combustion gas is a mixture of methane (0.6L / min) and oxygen (1.9L / min), and the mixture is ejected from a nozzle with a diameter of 2mm. The gas distribution plate is used to blow a large amount of air (6L / min) into the flame area, driven by the high-speed air flow, the combustion products leave the flame area quickly, and the sum of the radial cross-sectional area of ​​the gas through holes on the gas distribution plate is 3.5 square meters cm, the temperature drops to 40°C when the sample reaches the glass fiber filter paper. Catalyst particles obtained by combustion were collected with glass fiber filter paper. The particle diameter...

Embodiment 3

[0023] 43.6g of cerium acetylacetonate (Ce content 12%), 19.6ml of zirconium acetylacetonate and 86ml of xylene were mixed to prepare a precursor solution. The solution was placed on a magnetic stirrer and stirred until a clear solution was obtained. Use a syringe to pump the prepared solution into the flame at a rate of 5ml / min. The flame combustion gas is a mixture of methane (0.6L / min) and oxygen (1.9L / min), and the mixture is ejected from a nozzle with a diameter of 2mm. The gas distribution plate is used to blow a large amount of air (6L / min) into the flame area, driven by the high-speed air flow, the combustion products leave the flame area quickly, and the sum of the radial cross-sectional area of ​​the gas through holes on the gas distribution plate is 3.5 square meters cm, the temperature drops to 40°C when the sample reaches the glass fiber filter paper. Catalyst particles obtained by combustion were collected with glass fiber filter paper. The particle diameter i...

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Abstract

The invention provides a metastable cerium oxide or cerium-zirconium solid solution nano material, and the key technology for preparing the material is to ensure the formation of oxide particles withhigh crystallinity and avoid long-time high-temperature roasting. According to the method, a precursor is rapidly decomposed into oxide particles by utilizing high temperature generated by flame combustion, and meanwhile, a large amount of air is introduced to rapidly move the generated particles out of a high-temperature area and rapidly cool the particles, so that the particles don't undergo a high-temperature roasting stabilization process, and the oxide is fixed in a metastable state. The surface of the prepared metastable cerium oxide or cerium-zirconium solid solution nano material has alarge amount of active oxygen, and does not have or has a small amount of oxygen vacancies, lattice oxygen is in a metastable state, and the metastable cerium oxide or cerium-zirconium solid solutionnano material can be converted into a stable cerium-zirconium solid solution after long-time high-temperature roasting.

Description

technical field [0001] The invention relates to a metastable cerium oxide or cerium-zirconium solid solution nanomaterial, in particular to a cerium oxide or cerium-zirconium solid solution. During the stabilization process, the oxides that have not yet reached a stable state are extracted. The key technology is to ensure the formation of oxide particles with high crystallinity and avoid long-term high-temperature roasting. The invention uses the high temperature generated by flame combustion to quickly decompose the precursor into oxide particles, and at the same time introduces a large amount of air to quickly move the generated particles out of the high-temperature area and cool down extremely quickly, so that it avoids the stabilization process of high-temperature roasting and fixes the oxides. in a metastable state. There is a large amount of active oxygen on the surface of the material, there is no or a small amount of oxygen vacancies, and the lattice oxygen is in a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J23/10B01J35/02B01J37/08B01J35/00
Inventor 俞佳枫孙剑张继新张哲徐恒泳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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