Appearance controllable CeO2 precursor----- Ce2O(CO3)2 H2O powder preparation method

A precursor, the technology of ce2o, is applied in the fields of chemical instruments and methods, rare earth metal compounds, inorganic chemistry, etc., and can solve the problems of single particle shape, limiting the application and development of particles, etc.

Inactive Publication Date: 2006-04-26
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) CeO synthesized by one-step method 2 The shape of the particles is relatively simple, all of which are spherical
[0006] (2) CeO with different morphologies in

Method used

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  • Appearance controllable CeO2 precursor----- Ce2O(CO3)2 H2O powder preparation method
  • Appearance controllable CeO2 precursor----- Ce2O(CO3)2 H2O powder preparation method
  • Appearance controllable CeO2 precursor----- Ce2O(CO3)2 H2O powder preparation method

Examples

Experimental program
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Effect test

example 1

[0039] Example 1: Dissolving solid trivalent cerium salt in water to form 0.1mol L -1 solution, add urea to this solution to form Ce 3+ : The clarified mother liquor of urea=1:40. Add the cationic surfactant cetyltrimethylammonium bromide (CTAB) that is 0.5% by weight in this mother liquor, put the mixed solution into the constant temperature water bath of 80 ℃ and stir continuously for several hours, the reaction process produces abundant white foam. The precipitate was separated by centrifugation, washed with deionized water and then with ethanol. The precipitate was dried at room temperature to obtain a shuttle-like Ce with uniform morphology 2 O(CO 3 ) 2 ·H 2 O white powder, XRD confirmed that its degree of crystallization is strong.

example 2

[0040] Example 2: Dissolving solid trivalent cerium salt in water to form 0.2mol L -1 solution, add urea to this solution to form Ce 3+ : The clarified mother liquor of urea=1:50. Add 0.7% by weight cationic surfactant diisooctyl sodium sulfosuccinate (A-OT) to this mother liquor, and put the mixed solution in a constant temperature water bath at 90°C for continuous stirring for several hours, and there is no foam in the reaction process produce. The precipitate was separated by centrifugation, washed with deionized water and then with ethanol. The precipitate is dried at room temperature, and the Ce with a relatively uniform shape is obtained. 2 O(CO 3 ) 2 ·H 2 O white powder, XRD confirms that its degree of crystallization is relatively strong.

example 3

[0041] Example 3: Dissolving solid trivalent cerium salt in water to make 0.1mol L -1 solution, add urea to this solution to form Ce 3+ : The clarified mother liquor of urea=1:25. Add 0.7% by weight non-ionic surfactant polyethylene glycol 19000 (PEG19000) to this mother liquor, and put the mixed liquor into a constant temperature water bath at 85° C. and stir continuously for several hours without abundant foam during the reaction. The precipitate was separated by centrifugation, and the precipitate was washed with dewatered water and then with ethanol. The precipitate is dried at room temperature, and the well-arranged and highly ordered Ce 2 O(CO 3 ) 2 ·H 2 O rod-shaped powder, XRD confirmed that its degree of crystallization is strong.

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Abstract

The present invention belongs to the field of chemical preparation technology of RE powder material. The form of the precursor has certain genetic inheritance to the form of final particle after calcinations. Unlike available one-step CeO2 synthesizing process forming single spherical particles, the multiple-step process of the present invention results in CeO2 precursor particles of different forms. The multiple-step process includes the steps of: dissolving trivalent Ce salt in distilled water to compound solution, adding urea to the Ce salt solution to form clear mother liquid of certain Ce ion/urea molar ratio, adding surfactant, continuously stirring in water bath of 70-95 deg.c for full reaction to obtain precipitate, and separating, collecting, washing and drying the precipitate to obtain Ce2O(CO3)2.H2O powder of different forms. The Ce2O(CO3)2.H2O powder has monocrystal structure of orthorhombic system in micron level, different forms and high crystallization degree.

Description

1. Technical field [0001] The invention belongs to the technical field of chemical preparation of rare earth powder materials. 2. Background technology [0002] my country is rich in rare earth resources, accounting for more than 80% of the world's proven reserves, of which cerium is the most abundant. Rare earth oxide CeO 2 It is a relatively important light rare earth product, which has been widely used in luminescent materials, catalysts, electronic ceramics, ultraviolet absorbers, precision polishing materials, etc. And because of its superior oxygen storage and release function and high-temperature rapid oxygen vacancy diffusion ability, it has become a very promising automotive exhaust catalytic purification material, solid oxide fuel cell (SOFC) anode material, electrochemical reaction promotion material, chemical machinery, etc. Polishing materials, etc. [0003] CeO 2 The acquisition of new properties and uses of particles is not only related to its chemical com...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 聂祚仁梅燕韩业斌邹景霞
Owner BEIJING UNIV OF TECH
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