STUDY OF THE PROPERTIES OF PENTASIL-CONTAINING CATALYSTS IN REACTIONS OF TRANSFORMATION OF HYDROCARBONS. 5. KINETICS AND MECHANISM OF AROMATIZATION OF PROPANE AND PROPYLENE ON Ga AND H FORMS OF PENTASILS

Article abstract of DOI:10.1007/BF00962367

The kinetics of transformations of propane and propylene on Ga-modified pentasils and the H-form of zeolite were investigated in a wide range of conversions (20-95percent).The selectivity of formation of aromatic hydrocarbons (ArH) on Ga-pentasils is significantly higher than on HTsVM.Quantitative data which demonstrate acceleration of aromatization of propane and propylene in modification of H-TsVM zeolite with gallium were obtained.An especially large increase in the reaction rate is observed in the case of the starting olefin: the rate constants on Ga/HTsVM and HTsVM are respectively equal to 9.21 and 1.44 sec^-1.The significant ef fect of H2 on the selectivity of action of the Zn/HTsVM system in aromatization of propane was demonstrated.The effect of H2 was virtually not manifested on Ga/HTsVM in the conditions studied.The data obtained in the study permitted introducing important corrections in the scheme of the mechanism of aromatization of lower alkanes examined in the literature.