Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1997-11-12
2000-06-27
Dunn, Tom
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
423212, 4232132, 4232392, 502 64, 502 66, 502 67, 502 74, 502325, 502339, B01J 802, B01J 2908, B01J 2940
Patent
active
060803754
ABSTRACT:
An exhaust gas purification catalyst with improved hydrocarbon conversion is disclosed, which contains metals from the platinum group as its catalytically active components. Two superposed functional layers are applied to one support. The catalyst has a first functional layer with a mixture of a first catalyst with at least one zeolite and the second functional layer applied to the first functional layer which contains a mixture of a second catalyst and at least one zeolite. The zeolites exhibit a molar ratio of silicon dioxide/aluminum oxide of more than 40 and in that at least palladium and rhodium are present as the platinum group metals and are each contained separately from one another in only one of the two catalysts. The catalyst is distinguished by particularly good suppression of hydrocarbon emissions during cold-starting and exhibits particularly good long-term stability.
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Kreuzer Thomas
Lindner Dieter
Lox Egbert
Mussmann Lothar
Van Yperen Renee
Degussa Aktiengesellscaft
Dunn Tom
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