부산대학교 도서관

Changes in catalyst activity with time for oxidative dehydrogenation of butene were studied in a flow system at the atmospheric pressure. All the data were obtained by using the feed of constant partial pressure of butene.It was observed that there was no activity change at high partial pressures of oxygen, but at low partial pressures of oxygen the activity declined with time in early stages. The initial activity, however, seemed to be independent of partial pressures of oxygen.The catalyst activity was completely regenerated with air. The amount of coke formation on the catalyst after each reaction with various feed compositions was measured, but it was difficult to relate the coke formation with the decline in activity.From the measurement of the reduction state of catalysts in the reaction conditions and from the experiment of inhibitive action of products, it was assumed that the decline in activity at high temperatures was mainly due to reduction of catalysts in the reaction conditions, while at low temperatures inhibitive action of products causes initial activity changes.