Compositions based on cerium oxide, zirconium oxide and, optionally, another rare earth oxide, having a specific raised surface at 1100.degree.c, method for the production and use thereof as a catalyst
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United States of America Patent
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Issued Date -
Sep 21, 2006
app pub date -
Mar 17, 2004
filing date -
Mar 18, 2003
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Abandoned
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Abstract
The inventive composition, according to a first embodiment, consists essentially of a cerium oxide and a zirconium oxide in an atomic ratio Ce/Zr of at least 1. According to a second embodiment, said composition is based on cerium oxide, zirconium oxide with an atomic ratio Ce/Zr of at least 1 and at least one rare earth oxide other than cerium. After calcination at 1100 C., said composition has a specific surface of at least 9 m2/g in the first embodiment and at least 19 m2/g in the second embodiment. The inventive composition can be used as a catalyst especially for the treatment of waste gases from internal combustion engines.
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