Unlock instant, AI-driven research and patent intelligence for your innovation.

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 , thermal stability is not good enough and other problems, to achieve the effect of high specific surface, good thermal stability, simple preparation process

Inactive Publication Date: 2004-12-15
ZHEJIANG UNIV
View PDF0 Cites 0 Cited by
  • 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 method, but what is prepared is a single-component oxide (references J-T Jiu, Yue Ge, S-R Zhang, L-P Li, Fan Tu, H-S Zhu, J.of Inorg.Mater.16(5) 2001, 867), there is no preparation method for cerium-zirconium-barium composite oxide

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The preparation of cerium-zirconium-barium composite oxide powder comprises the following steps:

[0013] (1) by Ce: Zr: the ratio of Ba is Ce=X (X is 0.1~1), Zr=1-X, the mol ratio of Ba=Y (Y=0.1~0.5) calculates and weighs 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.

[0014] (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.

[0015] (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 ...

Embodiment 2

[0017] The ratio of Ce: Zr: Ba is Ce=0.7, Zr=0.3, and the molar ratio of Ba=0.1 calculates and weighs 12.159g Ce (NO 3 ) 3 ·6H 2 O, 5.152g Zr(NO 3 ) 4 ·5H 2 O, 1.048g Ba(NO 3 ) 2 , add appropriate amount of water to dissolve and set aside. The following steps are the same as in Example 1.

[0018] 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an ultrafine cerium-zirconium-barium composite oxide and a preparation method thereof, the molecular formula is CexZr1-xBayOz, and the molar ratio of cerium, zirconium and barium is Ce=X (X=0.1~1): Zr=1-X : Ba=Y (Y=0.1~0.5), which is made by using metal nitrate, cerium nitrate, zirconium nitrate and barium nitrate as raw materials, through polyethylene glycol polymer surface modifier, and adopting the method of n-butanol azeotropic distillation Obtained, the roasting temperature is 600 DEG C~700 DEG C, and roasting time is 3~4 hours. The invention has the advantages of simple technological process, high specific surface area, nanoscale powder and good thermal stability.

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 problem...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/14C01F11/02C01F17/00C01G25/02
Inventor 陈敏张培壮郑小明
Owner ZHEJIANG UNIV