Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 1771 - 1778 (1987)
Update date:2022-08-18
Topics:
Sayed, Moein B.
A comparative F.t.i.r./g.c.-m.s. study of MTG conversion on a series of progressively dealuminated HZSM-5 and H-mordenite surfaces reveals the role of zeolite dealumination in modifying the zeolite pore void (i.e. catalytic volume) and therefore shape-selectivity.This is illustrated by aa different distribution of the primary alkenes formed under similar experimental conditions.G.c-m.s. analysis of a reaction at the early stages of dimethylether conversion reveals that ethene, which forms in trace quantities on HZSM-5, is dominant on H-mordenite.The propene/butenes ratio is high (c.a. 1.7) for H-mordenite, but is <1.0 and decreased with increased dealuminatiom for HZSM-5.Isobutene dominates for increasingly dealuminated HZSM-5.Methanol reformation proceeds concurrently with alkene formation, suggesting a route involving either propagation and/or decomposition to alkenes.The mechanistic implications of the interdependence of zeolite dealumination, modified pore void and identifi of alkenes are analysed.
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