Abstract
The oxidative dehydrogenation of 1-butene to 1, 3-butadiene was investigated with Fe-Sb-O catalysts. The catalytic activity tests were carried out by a conventional flow method under the atmospheric pressure. By the use of a pulse method in which the butene pulses were repeatedly injected, the reduction process of the oxide catalysts was investigated in detail. The temperature-programmed reduction and reoxidation were also applied.
The catalysts having an atomic ratio of Sb/Fe higher than the un ity showed a high activity and selectivity for the oxidative dehydrogenation to butadiene. The extent of simultaneous isomerization of 1-butene to 2-butenes was usually small. The reaction rate was approximately of the first order in butene pressure and of the zeroth order in oxygen pressure. The comparison of the results obtained from the flow method with those from the pulse method indicated that the catalyst surface under the reaction conditions of the flow methed was in the oxidation state slightly lower than FeSbO4.
