Evolution of Hydrocarbon Pool over SAPO‐34 Catalyst during Methanol to Light Olefins

Abstract

The coke deposition behaviors and the evolution of hydrocarbon pool species of SAPO-34 during the methanol to olefins (MTO) process were investigated. Retained hydrocarbon analysis was employed to explore the amount and the category of coke in the cages of thermally quenched SAPO-34 samples which had been used as the catalyst in the MTO reaction. The coke lead to the distinct microstrain of unit cell. The UV-vis spectra and GC-MS studies showed the evolution of hydrocarbon pool species from monocyclic to polyaromatic. Furthermore, the linearly increasing of coke content and linearly reducing of surface area of SAPO-34 indicated that the deactivation of catalyst was mainly caused by the blockage of SAPO-34 pore.