THE INFLUENCE OF ADAMANTANE ON THE REACTION OF N-HEPTANE OVER H-Y, H-BETA AND H-MORDENITE ZEOLITES

The effect of adamantane (Ad) on the activity and selectivity of acidi c zeolites Y, beta and mordenite (M) in the isomerization and cracking of n-heptane (C-7) in He at 443 K was studied. Ad was found to promot e the isomerization of C-7. The Ad uptake of the zeolites, and the IR spectra obtained from the zeolite-bound Ad were determined It was foun d that Ad did not remain completely unconverted under the conditions o f the C-7 reaction. The activity of the catalysts in the conversion of Ad increased in the sequence of H-Y < H-beta < H-M. Existing data sug gest that a fraction of the Ad, responsible for the cocatalytic effect , can participate in hydride transfer processes and remain unconverted , while another fraction, depending an catalyst acidity, is converted to dimer and oligomers.