Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2005-02-08
2005-02-08
Ildebrando, Christina (Department: 1725)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S302000, C502S303000, C502S324000, C502S340000, C502S344000, C502S325000, C502S328000, C502S330000, C502S349000
Reexamination Certificate
active
06852666
ABSTRACT:
A composition for purifying exhaust gases of an internal combustion engine capable of consuming fuel with lean air-fuel ratios includes elements adsorbing the NOxpresent in the exhaust gases, in the presence of excess oxygen and releasing the adsorbed NOxwhen the oxygen concentration of the exhaust gases decreases. The NOxadsorbing element includes in combination: a first composition comprising a support and an active phase, the active phase being based on manganese and at least another element A selected among, alkalines and alkaline-earths, the manganese and element A being chemically bound; a second composition including a support and an active phase based on manganese and at least another element B selected among alkalines, alkaline-earths and rare earths, the second composition having or being capable of having a specific surface area of at least 80 m2/g after being calcined at 800° C., and furthermore, a reducing and/or three-way catalyst function is incorporated in the NOxadsorbing element.
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Translation of KR 97-20188, May, 1997.
Bert Christian
Birchem Thierry
Bouly Christophe
Guyon Marc
Hedouin Catherine
Faurecia Systemes d'Echappement
Ildebrando Christina
Renault
Rhodia Chimie
Young & Thompson
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