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Ceriumoxideisusedwidelyinthree waycatalystduetoitsoxygenstoragecapabilitywhichenablesthecatalysttooperatemoreefficientlybymakingitlesssensitivetothevariationofoxygenconcentrationinex haustgasstream[1~ 3] .TheoxygenstoragecapabilityofceriastemsfromthevalencechangebetweenCe3+andCe4 +[1,2 ] .Thereareafewotherelementswithvariableoxidationstatewithinthewholeseriesofrareearth .Praseodymiumisoneoftheelementswhichcanformaspectrumofoxygen deficientornonstoi chiometricPrOx.Ontheotherhand ,theproperti… 相似文献
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