Chrome aluminum propane dehydrogenation catalyst, prepared by a modified coprecipitation

There is method for making of propane dehydrogenation chrome aluminum catalyst, which increases the activity and thermal stability of the catalyst compared with the currently known catalysts. For the first time the modified coprecipitation method is used for chrome aluminum catalyst preparation, in which a suspension of chromium and aluminum hydroxides are subjected of high temperature treatment (550 °C). The proposed method is simple, reducing the number of catalyst preparation stages. Using a complex of physical and chemical methods, we studied the phase composition, texture of the catalyst, the formation and properties of surface-active forms, depending on the catalyst preparation conditions. Selected conditions of catalyst preparation provide a high surface area and a strong connection between surface forms of chromium and support that prevents the formation of catalytically inactive forms of α-Cr2O3 in the process of calcination. We synthesized and studied laboratory samples of chrome aluminum catalyst with different chromium content (2,8–11,3 wt.%). Key indicators (the propane conversion and propylene selectivity, resistance to coke formation) of the catalyst are not inferior to the most active samples well-known from literature, also the catalyst have high activity at low chromium content (2,8–5,5 wt.%). The developed method is protected by patent of the Russian Federation and recommended for improvement of industrial technology.

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