Exhaust-gas purification catalyst to be used close to the engine and process for its production
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United States of America Patent
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Apr 5, 2005
Grant Date -
Apr 4, 2002
app pub date -
Aug 14, 2001
filing date -
Aug 16, 2000
priority date (Note) -
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Abstract
A starter catalyst for the purification of the exhaust gases from internal combustion engines, which include palladium on aluminum oxide and of barium oxide, as well as a process for its production. The barium oxide and palladium are together deposited in a finely divided state on the supporting material aluminum oxide and the average particle size of the palladium crystallites is between 3 and 7 nm. The small crystallite size of palladium and the barium oxide likewise deposited in finely divided state on the supporting material impart to the catalyst a high activity and long-term stability to high temperature stresses.
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