Effects of isobutylene on isobutane isomerization over H-mordenite

摘要

Reaction kinetics studies were conducted of isobutane conversion over H-mordenite at 473 K using a system comprised of two reactors connected in series. The first reactor was loaded with Pt/Sn catalyst and controlled the olefin concentration in the feed to the second reactor containing H-mordenite by varying the dehydrogenation-hydrogenation equilibrium between butanes and butenes. The presence of isobutylene increases the rate of isobutane isomerization and increases the rates of side reactions such as coking and oligomerization/beta-scission processes which lead to C-3, C-5, and C-6 products. The kinetic data for the production of C-3, C-4, C-5, and C-6 species were described by a kinetic model involving olefin adsorption/desorption, oligomerization/beta-scission, and hydride transfer steps. The rates of oligomerization/beta-scission steps involving C-4 species are faster than the rates of hydride transfer for our reaction conditions. (C) 1998 Academic Press. [References: 34]