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Preparation method of CeO2/gamma-Al2O3 multi-level structure composite microspheres

A composite microsphere, hierarchical structure technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as regulation and control without structure and morphology

Inactive Publication Date: 2013-12-11
嘉善华阳木业植绒有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the above-mentioned preparation methods are nanoparticles or their random aggregates, without adjusting the structure and morphology.

Method used

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  • Preparation method of CeO2/gamma-Al2O3 multi-level structure composite microspheres
  • Preparation method of CeO2/gamma-Al2O3 multi-level structure composite microspheres
  • Preparation method of CeO2/gamma-Al2O3 multi-level structure composite microspheres

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Dissolve potassium aluminum sulfate and ceric sulfate in deionized water to make the concentrations 0.04mol / L and 4mmol / L respectively, then add urea to make the concentration 0.2mol / L under stirring at room temperature, and continue stirring for 10 minutes to make them completely Dissolve to ensure that the reactants are mixed evenly;

[0020] 2. Transfer the above mixed solution to a stainless steel reaction kettle lined with polytetrafluoroethylene, seal it, react at 180°C for 5 hours, and cool it down to room temperature naturally;

[0021] 3. Centrifuge the above reaction mixture at 3000r / min for 5min, pour off the supernatant, wash the obtained precipitate repeatedly with water and ethanol, and then dry it in a 60°C drying oven to obtain the precursor CeO 2 / AlOOH composite microspheres;

[0022] 4. Put the dried precursor microspheres into the muffle furnace, raise the temperature to 800°C at a rate of 1°C / min, and keep it for 1h to obtain CeO 2 / γ-Al 2 o ...

Embodiment 2

[0024]1. Dissolve aluminum potassium sulfate and ceric sulfate in deionized water to make the concentrations 0.04mol / L and 6mmol / L respectively, then add urea under stirring at room temperature to make the concentration 0.2mol / L, and continue to stir for 10 minutes to make them completely Dissolve to ensure that the reactants are mixed evenly;

[0025] 2. Transfer the above mixed solution to a stainless steel reaction kettle lined with polytetrafluoroethylene, seal it, react at 180°C for 5 hours, and cool it down to room temperature naturally;

[0026] 3. Centrifuge the above reaction mixture at 3000r / min for 5min, pour off the supernatant, wash the obtained precipitate repeatedly with water and ethanol, and then dry it in a 60°C drying oven to obtain the precursor CeO 2 / AlOOH composite microspheres;

[0027] 4. Put the dried precursor microspheres into the muffle furnace, raise the temperature to 700°C at a rate of 1°C / min, and keep it for 1h to obtain CeO 2 / γ-Al 2 o 3 ...

Embodiment 3

[0029] 1. Dissolve aluminum potassium sulfate and ceric sulfate in deionized water to make the concentrations 0.04mol / L and 4mmol / L respectively, then add urea under stirring at room temperature to make the concentration 0.4mol / L, and continue to stir for 10 minutes to make them completely Dissolve to ensure that the reactants are mixed evenly;

[0030] 2. Transfer the above mixed solution to a stainless steel reaction kettle lined with polytetrafluoroethylene, seal it, react at 180°C for 5 hours, and cool it down to room temperature naturally;

[0031] 3. Centrifuge the above reaction mixture at 3000r / min for 5min, pour off the supernatant, wash the obtained precipitate repeatedly with water and ethanol, and then dry it in a 60°C drying oven to obtain the precursor CeO 2 / AlOOH composite microspheres;

[0032] 4. Put the dried precursor microspheres into the muffle furnace, raise the temperature to 600 °C at a rate of 1 °C / min, and keep it for 2 hours to obtain CeO 2 / γ-Al ...

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Abstract

The invention discloses a preparation method of CeO2 / gamma-Al2O3 multi-level structure composite microspheres, which comprises the following steps: firstly reacting under a hydrothermal condition by taking water as a reaction medium, KAl(SO4)2.12H2O as an aluminum source, ceric sulfate as a cerium source and urea as a precipitating agent; performing centrifugal washing on the product and drying to obtain precursor CeO2 / gamma-AlOOH microspheres with regular and controllable appearance; then putting the dried precursor CeO2 / gamma-AlOOH multi-level structure microspheres in a muffle furnace; heating at a certain heating speed to 600-800 DEG C; preserving heat for 1-4 hours to decompose the gamma-AlOOH; and performing phase transformation to obtain the CeO2 / gamma-Al2O3 multi-level structure composite microspheres. By adopting the method disclosed by the invention, the prepared CeO2 / gamma-Al2O3 multi-level structure composite microspheres are of hollow structures and are formed by sheet nanocrystallines. The CeO2 / gamma-Al2O3 multi-level structure composite microspheres have the features of a nano structure as well as the advantages of a micron structure, and are of great significance to the development of a novel catalyst.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials and relates to a CeO 2 / γ-Al 2 o 3 The preparation method of the composite material, in particular, involves a CeO 2 / γ-Al 2 o 3 The preparation method of the multi-level structure composite microsphere. Background technique [0002] γ-Al 2 o 3 With the characteristics of large surface area, good adsorption performance and acidic surface, it is widely used as catalyst, catalyst carrier and adsorbent in petrochemical industry. CeO 2 It is the most active oxide among the rare earth oxides, with high oxygen storage capacity, oxygen release capacity, and strong oxidation-reduction capacity. Therefore, people pay more and more attention to the application of catalysts, catalyst supports and cocatalysts in catalytic research. [0003] CeO 2 with γ-Al 2 o 3 Composite prepared CeO 2 / γ-Al 2 o 3 Composite nanostructured catalysts that embody both CeO 2 Oxygen storage performan...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J32/00B01J35/08
Inventor 宋彩霞王德宝朱琪琪曹长青
Owner 嘉善华阳木业植绒有限公司
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