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1. (WO2004035202) IMPROVED OXYGEN STORAGE COMPONENT

Pub. No.:    WO/2004/035202    International Application No.:    PCT/GB2003/004495
Publication Date: Apr 29, 2004 International Filing Date: Oct 17, 2003
IPC: B01D 53/04
B01J 20/06
B01J 23/10
B01J 35/04
B01J 37/02
B01J 37/12
Applicants: MAGNESIUM ELEKTRON LTD.
DI MONTE, Roberta
KASPAR, Jan
BRADSHAW, Heather
NORMAN, Colin
Inventors: DI MONTE, Roberta
KASPAR, Jan
BRADSHAW, Heather
NORMAN, Colin
Title: IMPROVED OXYGEN STORAGE COMPONENT
Abstract:
The present invention relates to oxygen storage components for catalytic converters for automobile exhaust system particularly for those with petrol-driven engines. The present invention provides a method of treating a material consisting of or containing ceria in order to improve its performance as an oxygen storage component of an exhaust gas purification system, which method comprises modifying at least some of the surface of the material by contact with an aqueous solution of a chemical treatment agent selected from hydrogen peroxide and nitric acid. The present invention also provides a novel material consisting of or containing ceria whose surface has been modified by chemical treatment whereby the material possesses a Tmax of less than 500°C, preferably less than 400°C and more preferably less than 300°C, optionally with at least some anisotropy in its crystallite size.