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Preparation method of spindle-shaped CeO2 microcrystal

A microcrystalline and shuttle-shaped technology, applied in chemical instruments and methods, rare earth metal compounds, inorganic chemistry, etc., can solve the problems of high energy consumption and complicated process of calcination process, and achieve simple process operation, low cost and high yield Effect

Inactive Publication Date: 2013-04-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process is relatively complicated, especially the calcination process consumes a lot of energy

Method used

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  • Preparation method of spindle-shaped CeO2 microcrystal
  • Preparation method of spindle-shaped CeO2 microcrystal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1) First, pure Ce(NO 3 ) 3 ·6H 2 O is dissolved in deionized water to make a solution A of 0.01mol / L;

[0013] 2) Secondly, according to PEG6000, urea: Ce(NO 3 ) 3 ·6H 2 O is a molar ratio of 5:1:1. Add PEG6000 and urea to solution A, and keep stirring at 60°C for 2 hours to obtain solution B;

[0014] 3) Finally, move the evenly stirred solution B into the reaction kettle, place it in an oven at 180°C for 15 hours, wash it by centrifugation after the reaction, and dry it at 80°C to obtain the spindle-shaped CeO 2 Microcrystalline.

[0015] The resulting fusiform CeO 2 The microcrystal is measured with a D / Max-2200pc type X-ray diffractometer produced by Japan Rigaku Company, and the results are as follows: figure 1 As shown, a pure-phase fusiform CeO with better crystallinity was obtained 2 Microcrystalline, the JCPDS card number of the found product is 33-0394, which belongs to the cubic crystal system. The microscopic morphology of the sample was observed w...

Embodiment 2

[0017] 1) First, pure Ce(NO 3 ) 3 ·6H 2 O is dissolved in deionized water to make a solution A of 0.02mol / L;

[0018] 2) Secondly, according to PEG6000, urea: Ce(NO 3 ) 3 ·6H 2 O is a molar ratio of 4:1.5:1. Add PEG6000 and urea to solution A, and keep stirring at 60°C for 2 hours to obtain solution B;

[0019] 3) Finally, move the evenly stirred solution B into the reaction kettle, place it in an oven at 160°C for 20 hours, wash it by centrifugation after the reaction, and dry it at 80°C to obtain the spindle-shaped CeO 2 Microcrystalline.

Embodiment 3

[0021] 1) First, pure Ce(NO 3 ) 3 ·6H 2 O is dissolved in deionized water to make solution A of 0.04mol / L;

[0022] 2) Secondly, according to PEG6000, urea: Ce(NO 3 ) 3 ·6H 2 O is a molar ratio of 6:0.5:1. Add PEG6000 and urea to solution A, and keep stirring at 60°C for 2 hours to obtain solution B;

[0023] 3) Finally, move the evenly stirred solution B into the reaction kettle, place it in an oven at 190°C for 10 hours, wash it by centrifugation after the reaction, and dry it at 80°C to obtain the spindle-shaped CeO 2 Microcrystalline.

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Abstract

The invention discloses a preparation method of a spindle-shaped CeO2 microcrystal, which comprises the steps of dissolving Ce(NO3)3.6H2O in deionized water to prepare a solution A, adding PEG6000 (polyethylene glycol 6000) and carbamide into the solution A, stirring continuously for 2h at 60DEG C to obtain a solution B, moving the uniformly stirred solution B into a reaction kettle, placing in an oven for reaction, conducting centrifugal washing after the reaction, drying, and obtaining the spindle-shaped CeO2 microcrystal. The spindle-shaped CeO2 microcrystal is synthesized in one step by taking PEG6000 as a feature control agent and adopting a hydrothermal method, and the spindle-shaped CeO2 microcrystal that is regular in feature and has average length about 15 micrometers is prepared by taking Ce(NO3)3.6H2O, PEG6000 (polyethylene glycol 6000), carbamide as raw materials and adopting the hydrothermal method. The method has the special advantages that the raw materials are relatively cheap; the cost is low; the productivity is greater; and the technological operation is simple. The method can be directly applicable to the preparation of doped and compound CeO2 powder.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, in particular to a shuttle-shaped CeO 2 Method for the preparation of microcrystals. Background technique [0002] CeO 2 It is the most common rare earth oxide. Because of its unique fluorite structure and excellent redox performance, it is widely used in three-way catalysts, water gas conversion, gas sensors, polishing materials, oxygen storage materials, ultraviolet Absorbents, photocatalysts and solid oxide fuel cells (SOFC), etc. In three-way catalysts, CeO 2 As a carrier, it is often combined with nanoparticles of metals such as Au, Ag, Pt, Cu, etc., and provides active oxygen to the nano-metals when the catalytic reaction is in progress. It is self-evident that it plays an important role. CeO 2 As a very important polishing material, it has the characteristics of simple polishing process, fast polishing speed, less consumption, and large output. It is mainly used in optoelect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 王芬周长江李承泽
Owner SHAANXI UNIV OF SCI & TECH
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