Multi-scaled oxygen storage material based on ceria-zirconia having high oxygen storage and releasing ability and a preparation method thereof

Patent metadata

Field	Value
Publication number	US-9975107-B2
Application number	US-201615297760-A
Country	US
Kind code	B2
Filing date	Oct 19, 2016
Priority date	Apr 14, 2016
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A multi-scaled oxygen storage material wherein cobalt element is complexed with a size of an atom or hundreds of nanometers or smaller in a ceria-zirconia solid solution and a method for preparing the same as provided.
Specifically, the multi-scaled oxygen storage material contains a ceria-zirconia solid solution, a cobalt doping contained in the solid solution in the form of an atom and a cobalt-based nanocluster dispersed in the solid solution as cobalt oxide and exhibits a microstructure distinguished from that of the existing ceria-zirconia (CZO)-based oxygen storage material as well as remarkably improved oxygen storage and release ability, and the method for preparing the same is provided.

First claim

What is claimed is:

1. A multi-scaled oxygen storage material comprising:
a ceria-zirconia solid solution;
a cobalt dopping included in the solid solution in a form of an atom at a saturation concentration; and
a cobalt-based nanocluster dispersed in the solid solution in a form of cobalt oxide.

2. The multi-scaled oxygen storage material according to claim 1 , wherein the cobalt-based nanocluster is included at a concentration of more than 0 to equal to or less than 45 mol %.

3. A method for preparing the multi-scaled oxygen storage material according to claim 2 , which comprises:
(a) stirring a mixture of cerium nitrate (Ce(NO 3 ) 3 .6H 2 O), zirconium nitrate (ZrO(NO 3 ) 2 ), cobalt nitrate (Co(NO 3 ) 2 .6H 2 O) and glycine, and then reacting the mixture; and
(b) calcining the mixture.

4. A method for preparing the multi-scaled oxygen storage material according to claim 1 , which comprises:
(a) stirring a mixture of cerium nitrate (Ce(NO 3 ) 3 .6H 2 O), zirconium nitrate (ZrO(NO 3 ) 2 ), cobalt nitrate (Co(NO 3 ) 2 .6H 2 O) and glycine, and then reacting the mixture; and
(b) calcining the mixture.

Assignees

• Korea Inst Sci & Tech

Inventors

• Kim Hyoung Chul
• Lee Hae Weon
• Kim Byung Kook
• Lee Jong Ho
• Son Ji Won
• Yoon Kyung Joong
• Hong Jong Sup
• Song Seung Hak

Classifications

• C04B2235/3852

  Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride · CPC title

• B01D2256/12

  Oxygen · CPC title

• B01D2255/20746

  Cobalt · CPC title

• B01J20/3078

  Thermal treatment, e.g. calcining or pyrolizing · CPC title

• B01D2255/2065

  Cerium · CPC title