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- W2078391175 abstract "The surface interactions of NO and CO with LaMO3 perovskites (M = Cr, Mn, Fe, Co, Ni) have been studied by volumetric adsorption and infrared spectroscopy. NO adsorption at 200 mm Hg on LaNiO3 was found to be constant over the temperature range 200–750 K. NO adsorption on LaMO3 oxides at room temperature as a function of the atomic number of M showed maxima for LaMnO3 and LaCoO3 while CO adsorption exhibited one maximum for LaFeO3. The inhibiting effect of NO preadsorption on the subsequent adsorption of CO was found to be larger than the inhibiting effect of CO on NO adsorption. NO is apparently more strongly adsorbed than CO on the surface of these oxides. Infrared spectra after simultaneous adsorption of NO + CO on LaFeO3 contained bands between 1650 and 850 cm−1 due to species formed by the interaction of NO and CO with oxygen ions in the oxide surface, and a band at 2170 cm−1 assigned to isocyanate species. Spectra in the region 2300-1900 cm−1 after simultaneous adsorption of NO + CO on LaCoO3 contained bands at 2175 and 2000 cm−1, the latter being assigned to NO adsorbed via a donor-type or coordinative bond. The numbers of NO molecules adsorbed at monolayer coverage on the LaMO3 oxides did not equal estimated numbers of transition metal ions exposed in the oxide surfaces. The observed constancy of NO adsorption on LaFeO3 and LaNiO3 over a wide range of temperatures could provide a method for oxide characterization." @default.
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- W2078391175 date "1985-10-01" @default.
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- W2078391175 title "Surface interactions of NO and CO with LaMO3 oxides" @default.
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- W2078391175 doi "https://doi.org/10.1016/0021-9517(85)90134-4" @default.
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