DEHYDROCYCLIZATION OF N-OCTANE - H D EXCHANGE AND REVERSIBLE ADSORPTION FOR A PT-SN-SIO2 CATALYST/

With a Pt-SiO2 catalyst n-octane underwent dehydrocyclization in the p resence of D-2 or with an equimolar mixture of n-octabe-d(0) and n-oct ane-d(18) without a measurable extent of HID exchange in the unconvert ed n-octane. When similar experiments were conducted with a Pt-Sn-SiO2 H/D exchange occurred. The results suggest that tin functions to decr ease the strength of chemisorption of n-octane at 482 degrees C so tha t adsorption is reversible in contrast to the irreversible adsorption for a Pt-SiO2 catalyst, The presence of tin allows HID exchange to occ ur in the unconverted n-octane. (C) 1995 academic Press, Inc.