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- W2212585985 abstract "The equilibrium and kinetics of adsorption of oxygen on LaCrO/sub 3/ have been studied in a wide range of temperatures (77 to 777 K). Above 350 K activated adsorption occurs; in this region, rather low coverages of oxygen (below 0.20) were recorded. The exponential decrease of the isosteric heat of adsorption with coverage suggests that the surface of LaCrO/sub 3/ is heterogeneous. After heating at 1270 K in H/sub 2/ only a reduction of 1.30 X 10/sup -2/ e/sup -/ per molecule of LaCrO/sub 3/ was attained, this shows a high stability of the Cr/sup 3 +/ ion in the perovskite structure. Concentration of hydroxyl groups after adsorption of H/sub 2/O on the reduced sample was found to be higher than that on the oxidized one. The kinetic data (at pressure or temperature constant) were analyzed according to Elovich's equation. From semilogarithmic plots of the initial adsorption rate versus 1/T an activation energy of adsoprtion of 16.4 kJ mol/sup -1/ was calculated. LaCrO/sub 3/ was found to adsorb less oxygen and to be more difficult to reduce with H/sub 2/ than LaCoO/sub 3/. This could account for the better catalytic properties of the latter for CO oxidation." @default.
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- W2212585985 date "1984-05-01" @default.
- W2212585985 modified "2023-09-26" @default.
- W2212585985 title "Surface properties of LaCrO/sub 3/: equilibrium and kinetics of O/sub 2/ adsorption" @default.
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