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- W1980014855 abstract "It has been observed that the catalytic activity of La0.7Pb0.3MnO3 for CO oxidation is greatly enhanced by the addition of platinum. The enhancement is up to 100 times greater than that expected for homogeneously distributed Pt whose specific activity is that of metallic Pt on Al2O3. X-Ray photoemission spectroscopy (ESCA) experiments show that Pt in these perovskites is in the form of the dissolved tetravalent ion. Catalytic activity measurements on BaPtO3 show that the specific activity of Pt4+ in that structure is about twice that of metallic Pt on Al2O3. Various observations of Pt concentrating at the surfaces of La0.7Pb0.3MnO3 can, in part, account for the enhanced activity. However, Pt4+ dispersed in La0.7Pb0.3MnO3 may still have a higher activity than Pt4+ in BaPtO3 since the measured surface concentration of Pt4+ cannot completely account for the observed activity. Additions of Pt to supported La0.5Sr0.5MnO3 and LaMn0.5Cu0.5O3 affect the activity of the former only slightly and may degrade the activity of the latter for CO oxidation. On the other hand, the Pt renders both compounds resistant to SO2 poisoning, the more so for the La0.5Sr0.5MnO3." @default.
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- W1980014855 date "1977-06-01" @default.
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- W1980014855 title "The nature and effects of platinum in perovskite catalysts" @default.
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- W1980014855 doi "https://doi.org/10.1016/0021-9517(77)90079-3" @default.
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