KINETIC REGIMES OF ZEOLITE DEACTIVATION AND REANIMATION

Hydrocarbon formation from methanol on zeolite H-ZSM-5 has been invest igated as a function of time at different temperatures. Thus results o f time resolved yield of deposit on the catalyst as well as of yield a nd detailed selectivity of volatile products have been obtained. The e xperimental data show the eminent role of amount and composition of th e compounds encaged in the zeolite pores. Kinetic regimes of preinitia tion, incubation, acceleration and retardation are discriminated and c haracterized. 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 temperat ure is also explained briefly.