PROPERTIES OF PENTASIL-CONTAINING CATALYSTS IN HYDROCARBON CONVERSIONS .7. BENZENE ALKYLATION BY LOWER ALKANES IN THE PRESENCE OF MODIFIED ZEOLITES

A novel catalytic synthesis of alkylaromatic hydrocarbons (AArH) containing C-7-C-8 has been achieved using C2-C4 alkanes as alkylating reagents on high silica zeolites of the pentasil type. It has been established that the yield of AArH during the reaction between benzene and alkanes varies in the order C2H6 < C3H8 less-than-or-equal-to C4C10 (450-600-degrees-C). Modification of the zeolite by additions of Pt, Zn, and Ga results in a lowering of the reaction temperature (by approximately 100-degrees-C) and alters the selectivity of the alkylation process. On passing from flow to static conditions and raising the pressure to 2-4 MPa the AArH yield doubles and reaches 70-75% in the case of C3-C4 hydrocarbons.