Propane dehydrogenation on VxOy/H-Ti-MCM-41.

Dehydrogenation of propane to propylene in absence and in presence of oxygen in the reaction mixture of propane-inert gas has been investigated on vanadium oxide supported on mesoporous H-Ti-MCM-41 titanosilicate prepared by hydrothermal synthesis from titanoaerosil. It has been shown that at increase of the amount of V_xO_y from 5 to 30 wt. %, supported by decomposition of vanadyl oxalate or acetylacetonate complexes, the orderliness of system H-Ti-MCM-41 is broken, the size of its surface, diameter and volume of mesopores are decreased. The maximum yield of propylene is reached at 650-675 °C. It is obtained on 20 % greater for dehydrogenation of propane in the absence of oxygen. It is dependent extremally on the formed volume of pores, on its relationship with the acidity of active surface sites and it is accounted for the certain optimum range of variation of these values. [ABSTRACT FROM AUTHOR]