A KINETIC STUDY OF OXIDATIVE DEHYDROGENATIONOF ISOBUTANE TO ISOBUTYLENE OVER CHROMIUMOXIDE SUPPORTED ON LANTHANUM CARBONATE

摘要

Kinetics of oxidative dehydrogenation of isobutane to isobutylene over chromium oxide supported on lantha-num carbonate was studied. The formation rate of isobutylene was found to be first order in isobutane andzero order in oxygen concentration and the rate limiting step was the regeneration of active sites by the gasphase oxygen. The formation of CO_2was due to the consecutive oxidation of isobutylene which occurred onthe same active sites used for isobutylene formation, not by the parallel oxidation of isobutane.