THE PECULARITIES OF THE ETHYLATION OF TOLUENE AND BENZENE ON MODIFIEDBETA ZEOLITES

The catalytic activity of Beta zeolites, modified with magnesium, boro n, and phosphorus compounds, was studied using benzene and toluene alk ylation by ethylene. The concentrations of different types of acid cen ters in these zeolites were measured using IR spectroscopy of OH group s and adsorbed CO. Ortho-, meta-, and para-isomer distributions of the primary alkylation products of toluene are determined by aromatic sub stitution rates. But, if the conditions for further isomerization of t he product are created by increasing either the reaction temperature o r the concentration of strong acid centers in the catalyst, the select ivity ratio among the isomers will be changed and approach the thermod ynamic equilibrium distribution. (C) 1994 Academic Press, Inc.