REACTIVATION OF THE HZSM-5 ZEOLITE-BASED CATALYST USED IN THE MTG PROCESS

The recovery of the acidic structure and activity during the regenerat ion step by coke combustion of an HZSM-5 zeolite-based catalyst used i n the methanol-to-gasoline (MTG) process in reaction-regeneration cycl es was studied. The reactivation kinetics (activity vs. coke combustio n time) was determined as a function of temperature and time on stream of the reaction step. The validity of the reactivation kinetic model was proven by using it for the simulation of the cyclic operation unde r conditions of catalyst partial reactivation, together with the kinet ic model for the MTG process.