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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9962684 B1

PDFFull Text
Date of Patent:
May. 08, 2018

Filed:

Apr. 25, 2014

Cerium-zirconium-based composite oxide and method for producing same

Applicant:

Daiichi Kigenso Kagaku Kogyo Co., Ltd., Osaka-shi, Osaka, JP;

Inventors:

Hiroyuki Hayashida, Osaka, JP;

Akiko Tatsumi, Osaka, JP;

Assignee:

DAIICHI KIGENSO KAGAKU KOGYO CO., LTD., Osaka, JP;

Attorney:

Westerman, Hattori, Daniels & Adrian, LLP

Primary Examiner:

Cam N Nguyen

Int. Cl.
CPC ...
B01J 21/06 (2006.01); B01J 23/02 (2006.01); B01J 23/04 (2006.01); B01J 23/10 (2006.01); B01J 23/34 (2006.01); B01J 23/72 (2006.01); B01J 23/745 (2006.01); B01J 23/75 (2006.01); B01J 23/755 (2006.01); B01J 23/83 (2006.01); B01J 37/08 (2006.01); B01J 37/00 (2006.01); C01G 25/00 (2006.01); C01G 45/12 (2006.01); C01G 49/00 (2006.01); C01G 51/00 (2006.01); C01G 53/00 (2006.01); C04B 35/486 (2006.01); C04B 35/50 (2006.01); C04B 35/653 (2006.01); C01G 45/00 (2006.01);
U.S. Cl.
CPC ...
B01J 23/83 (2013.01); B01J 23/10 (2013.01); B01J 23/34 (2013.01); B01J 23/72 (2013.01); B01J 23/745 (2013.01); B01J 23/75 (2013.01); B01J 23/755 (2013.01); B01J 37/0036 (2013.01); B01J 37/08 (2013.01); C01G 25/00 (2013.01); C01G 25/006 (2013.01); C01G 45/006 (2013.01); C01G 45/1221 (2013.01); C01G 49/009 (2013.01); C01G 49/0054 (2013.01); C01G 51/006 (2013.01); C01G 51/40 (2013.01); C01G 53/006 (2013.01); C01G 53/40 (2013.01); C04B 35/486 (2013.01); C04B 35/50 (2013.01); C04B 35/653 (2013.01); C01P 2002/36 (2013.01); C01P 2002/72 (2013.01); C01P 2002/74 (2013.01); C01P 2006/12 (2013.01); C01P 2006/90 (2013.01); C04B 2235/3205 (2013.01); C04B 2235/3206 (2013.01); C04B 2235/3208 (2013.01); C04B 2235/3224 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3227 (2013.01); C04B 2235/3229 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/3262 (2013.01); C04B 2235/3272 (2013.01); C04B 2235/3275 (2013.01); C04B 2235/3279 (2013.01); C04B 2235/3281 (2013.01); C04B 2235/5409 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/80 (2013.01);
Abstract

Provided is a cerium-zirconium-based composite oxide having an excellent OSC, high catalytic activity, and excellent heat resistance, and also provided is a method for producing the same. The cerium-zirconium-based composite oxide comprises cerium, zirconium, and a third element other than these elements. The third element is (a) a transition metal element or (b) at least one or more elements selected from the group consisting of rare earth elements and alkaline earth metal elements. After a heat treatment at 1,000° C. to 1,100° C. for 3 hours, (1) the composite oxide has a crystal structure containing a pyrochlore phase, (2) a value of {I111/(I111+I222)}×100 is 1 or more, and (3) the composite oxide has an oxygen storage capacity at 600° C. of 0.05 mmol/g or more, and an oxygen storage capacity at 750° C. of 0.3 mmol/g or more.

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