KINETIC REGIMES OF ZEOLITE DEACTIVATION AND REANIMATION

Hydrocarbon formation from methanol on zeolite H-ZSM-5 has been investigated as a function of time at different temperatures. Thus results of time resolved yield of deposit on the catalyst as well as of yield and detailed selectivity of volatile products have been obtained. The experimental data show the eminent role of amount and composition of the compounds encaged in the zeolite pores. Kinetic regimes of preinitiation, incubation, acceleration and retardation are discriminated and characterized. Temperature-programmed release of the organic material, encaged in the zeolite, leads to the characterization of the regime of zeolite reanimation. Deactivation through coking at elevated temperature is also explained briefly.