Catalyst for the purification of exhaust gases
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United States of America Patent
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Feb 28, 1989
Grant Date -
N/A
app pub date -
Dec 8, 1987
filing date -
Dec 24, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A catalyst for the purification of exhaust gases capable of maintaining excellent durability at elevated temperatures and preventing the formation of LaAlO.sub.3, comprises a support substrate, a catalyst carrier layer formed on the support substrate and catalyst ingredients carried on the catalyst carrier layer. The catalyst carrier layer comprises oxides of lanthanum and cerium in which the molar fraction of lanthanum atoms to the total rare earth atoms is 0.05 to 0.20, and the ratio of the member of the total rare earth atoms to the number of aluminum atoms is 0.05 to 0.25.
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