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Oxygen storage material production useful in exhaust gas cleaning catalyst, involves mixing aqueous solution of cerium oxide precursor with aqueous solution of precursor of oxide of metal, and adding first precipitation agent to mixture.
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2003 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

NOVELTY - Oxygen storage material production comprises mixing aqueous solution of cerium oxide precursor with aqueous solution of precursor of oxide of metal to form mixture, adding first precipitation agent to mixture to form aqueous suspension containing precipitate, separating precipitate from suspension, drying and calcining precipitate. The oxygen storage material comprises cerium oxide and second oxide of a metal. The metal is alkaline earth metal, rare earth metal, zirconium, zinc, cobalt, copper and/or manganese. USE - The method is useful for producing oxygen storage material useful in exhaust gas cleaning catalyst for purifying exhaust gases of internal combustion engines especially of stoichiometrically operated otto engines. ADVANTAGE - The method provides catalyst that shows excellent activity for purifying harmful pollutant like carbon monoxide, nitrogen oxides, and hydrocarbons. The oxygen storage materials are able to store oxygen in oxidizing atmosphere or release oxygen under reducing conditions, respectively. The oxygen storage material has high specific surface area after thermal aging and improved oxygen storage and release capacity under dynamic exhaust conditions. The storage material shows unprecedented high oxygen storage capacity and excellent dynamic properties with respect to oxygen storage and release compared to conventional materials. DESCRIPTION OF DRAWING(S) - The figure shows setup of precipitation reactor. Precipitation reactor (1) Hydrolysis reactor (2) Tubular flow reactor (3) Precipitation solution (4) Feed (5) Mixer (7) Ph meter (8)

Place, publisher, year, edition, pages
2003.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-51322ISI: 2007891493OAI: oai:DiVA.org:kth-51322DiVA: diva2:463862
Patent
US 7202194 (2007-04-10)
Note

US 7485599 (2009-02-03)

Available from: 2011-12-12 Created: 2011-12-12 Last updated: 2013-08-07Bibliographically approved

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