Selectivity and Deactivation Profiles of Zeolite Type Materials in the MTO Process

摘要: Abstract The reaction of methanol to olefins was studied over the following zeolite type materials: ZSM-5, SAPO-34 and chabazite (mineral). A strongly shape-selective catalyst (8-ring channels) is needed suppress formation aromatics, thereby get highest olefin selectivity. Olefin yields slightly above 80 mol% at close 100% conversion could be obtained with H-SAPO-34 catalyst. Fast deactivation main limitation in MTO reaction. rate, which much smaller case H-ZSM-5 catalysts, appears partly structure dependent, but a large difference rate between isostructural catalysts observed. Temperature programmed desorption ammonia showed ZSM-5 contain acid sites higher acidity than found SAPO-34. site content varies as follows: H-chabazite > H-ZSM-5.