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- W2010493676 abstract "Basic catalyst characterization studies of the title system were carried out to gain insight into the unique nature of zinc-chromium ferrite for the oxidative dehydrogenation of butene to butadiene. Relative reactivities of the various oxides in hydrogen and butene at temperatures up to 550 °C were determined by measuring catalyst weight loss in a flow, microbalance reactor. The ease of reducibility of oxide in hydrogen decreases in the following order: Fe2O3 > ZnFe2O4 > ZnCrFeO4 = FeCrO3 > ZnCr2O4 > ZnO > Cr2O3. In butene, Fe2O3 and FeCrO3 are reduced to lower-valence oxides, while ZnFe2O4, and ZnCrFeO4 lose approximately 2 monolayers of oxygen. Noteworthy is the fact that the latter are selective catalysts for butene dehydrogenation. In the presence of both butene and air at 350 °C, the ZnCrFeO4 catalyst at first rapidly gains weight, and then lines out. A carbonaceous deposit is present during the steady-state catalytic reaction while the catalyst remains essentially in the oxidized state. Regeneration in air returns the catalyst to its original weight. A surface reaction sequence for the oxidation dehydrogenation involving an iron-oxygen radical active center is proposed." @default.
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- W2010493676 date "1971-06-01" @default.
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- W2010493676 title "Catalyst characterization studies on the Zn$z.sbnd;Cr$z.sbnd;Fe oxide system" @default.
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- W2010493676 doi "https://doi.org/10.1016/0021-9517(71)90148-5" @default.
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