Composite cerium-zirconium-barium oxides and preparing method thereof

A composite oxide, cerium-zirconium technology, applied in the preparation of oxide/hydroxide, calcium/strontium/barium oxide/hydroxide, chemical instruments and methods, etc., can solve the problem that the specific surface is not large enough and the particles are easy to agglomerate , Insufficient thermal stability and other problems, to achieve the effect of high specific surface area, simple preparation process and good thermal stability

Inactive Publication Date: 2004-01-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has the phenomenon that the specific surface is not large enough, the particles are easy to agglomerate, etc., especially when it is used in the three-way catalyst of automobile exhaust, it is limited due to the insufficient thermal stability.
It is also prepared by azeotropic distillation, but what is prepared is a single-component oxide (references J-TJiu, Yue Ge, S-RZhang, L-PLi, Fan Tu, H-SZhu, J.of Inorg.Mater. 16(5)2001, 867), there is no preparation method for cerium-zirconium-barium composite oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1: the preparation of cerium-zirconium-barium composite oxide powder, its step is: (1) by Ce: Zr: the ratio of Ba is Ce=X (X is 0.1~1), Zr=1-X, Ba= Calculate the molar ratio of Y (Y=0.1~0.5) and weigh the corresponding amount of Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·5H 2 O, Ba(NO 3 ) 2 , add appropriate amount of water to dissolve and set aside. (2) Slowly add the mixed solution described in ① in 400ml of aqueous solution containing polyethylene glycol (molecular weight 20000) 20g, under magnetic stirring conditions, after the pH value of the solution is adjusted to be greater than 9 with ammonia water, the solution is maintained at - Keep at 5°C for 24 hours to obtain a gel. (3) Take the gel and filter it to remove the solvent, wash the gel several times with distilled water, dissolve it in 10 times of n-butanol, stir evenly, heat in a three-necked bottle, when it reaches 97°C, the azeotrope After the water is completely removed, the temperature rises r...

Embodiment 2

[0009] Calculate and weigh 12.159gCe (NO 3 ) 3 ·6H 2 O, 5.152gZr(NO 3 ) 4 ·5H 2 O, 1.048gBa(NO 3 ) 2 , add appropriate amount of water to dissolve and set aside. The following steps are the same as in Example 1.

[0010] The Ce prepared in this example 0.7 Zr 0.3 Ba 0.1 o 2.1 Composite oxide powder, particle size up to nanometer (10~20nm), specific surface (118.96m 2 / g), after high temperature treatment at 1000 °C, the cerium-zirconium-barium composite oxide has no agglomeration and particle growth.

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PUM

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Abstract

The invention provides a kind of super tiny cerium-zirconium-barium compound oxide and the manufacturing method. The molecular formula is CexZr1-xBayOz, the mol proportion of cerium, zirconium and barium is: Ce=X(X=0.1í½1) : Xr=1-X: Ba=Y(Y=0.1í½0.5), it uses metal nitrate such as cerium nitrate, zirconium nitrate, barium nitrate as materials, through polyglycol high molecular surface decorating agent, uses butyl alcohol azeotropy distillation. The baked temperature is 600 deg.C í½700 deg.C, the time is 3í½4 hours.

Description

technical field [0001] The invention relates to a cerium-zirconium composite oxide and a preparation method thereof, in particular to an ultrafine cerium-zirconium-barium composite oxide and a preparation method thereof. Background technique [0002] Due to the unique catalytic performance and oxygen storage and release performance of cerium-zirconium composite oxide, it can be used as a coating material for the three-way catalyst carrier of automobile exhaust, and can also be used as an oxidation catalyst carrier and active component. Ultrafine cerium-zirconium composite oxide nanomaterials have important uses in the synthesis of high-strength ceramic materials in addition to chemical applications. The existing cerium-zirconium composite oxide is two-component, and the method for preparing the cerium-zirconium composite oxide is mainly the traditional sol-gel method, which is prepared by adding a citric acid complexing agent. This technology has probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14C01F11/02C01F17/00C01G25/02
Inventor 陈敏张培壮郑小明
Owner ZHEJIANG UNIV
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