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- W2091203104 abstract "Bistability may be displayed by the system CuO used as a catalyst of propene oxidation under isothermal conditions and at low extents of reaction. This results from possible conversion of one Cu oxide into another under reacting conditions and from partial overlapping of the conditions of kinetic stability of both oxides. The phase changes of the solid are identified by X-ray analysis and are made visible by the strikingly different colors of the oxides. Under well-defined conditions, where the mass of the sample (Cu obtained from bulk CuO by reduction under a H2 flow at 400 °C for 2 h), grain size, residence time, and composition of the reactant mixture belong to an appropriate range, thermochemical oscillations are observed. CO2 formation, much more exothermic and oxygen-consuming than that of acrolein, is favored on CuO and causes overheating of the solid. Reducing conditions are then created, leading to Cu2O formation. On the latter oxide, acrolein is favored, so that less O2 is consumed and the temperature decreases, which allows the reoxidation of the solid. Particularities of the oscillating behavior can be interpreted in relation to the structural imperfections which are likely to result from repeated oxidations and reductions of the catalyst." @default.
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- W2091203104 date "1989-07-01" @default.
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- W2091203104 title "Oscillating oxidation of propene on copper oxides" @default.
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- W2091203104 doi "https://doi.org/10.1016/0021-9517(89)90308-4" @default.
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