Comparative Study of Methanol to Olefins Over ZSM-5, ZSM-11, ZSM-22 and EU-1: Dependence of Catalytic Performance on the Zeolite Framework Structure
The conversion of methanol to olefins (MTO) was comparatively conducted over four 10-ring zeolites, viz., ZSM-5, ZSM-11, ZSM-22 and EU-1, in both continuous-flow and pulse reactors, to reveal the relation between the catalytic performance and framework structure. The results illustrate
that the performance of a zeolite catalyst in MTO is closely dependent on its framework structure. Among four zeolites, ZSM-5 with three dimensional channels and intersections exhibits the highest catalytic activity and stability in MTO. In comparison with ZSM-5 and ZSM-11, ZSM-22 and EU-1
are deactivated much more rapidly due to the blockage of the pore opening. Especially, the straight channels of ZSM-11 facilitate the orderly array of butene molecules in the channels, which may promote the hydrogen transfer reaction and lead to high selectivity to butane and C5+
products, in comparison with ZSM-5. The hydrocarbon pool mechanism is also applicable in ZSM-22, though less important; the 1D straight channels in ZSM-22 are easily blocked, leading to the quick deactivation. EU-1 zeolite exhibits quite high selectivity to propene due to its large 12-ring
side-pockets in which polyalkylbenzenes are formed as the hydrocarbon pool species. The insights shown in this work are conducive to the development of better MTO catalysts and reaction processes.
Keywords: EU-1; Framework Structure; Methanol to Olefins; Pulse Reaction; ZSM-11; ZSM-22; ZSM-5
Document Type: Research Article
Affiliations: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi 030001, P. R. China
Publication date: 01 June 2017
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