Methanol to Gasoline-Range Hydrocarbons: Influence of Nanocrystal Size and Mesoporosity on Catalytic Performance and Product Distribution of ZSM-5

Ind. Eng. Chem. Res., 2011, 50 (21), pp 11872–11878

Methanol to Gasoline-Range Hydrocarbons: Influence of Nanocrystal Size and Mesoporosity on Catalytic Performance and Product Distribution of ZSM-5

Ali A. Rownaghi* and Jonas Hedlund

ali.rownaghi@gmail.com

ali.rownaghi@ltu.se

Division of Chemical Technology, Luleå University of Technology, SE-971 87 Luleå, Sweden

Abstract

Decreasing zeolite crystal size and introducing mesoporosity into the zeolite structure can improve performance in catalytic reaction by decreasing the micropore diffusion path-length and increasing the external surface area.

Three separate ZSM-5 zeolites were prepared by a single-templating procedure. The reaction of methanol to gasoline-range hydrocarbons was evaluated over synthesized ZSM-5 crystals in a fixed-bed continuous flow reactor. Authors observed good correlation between catalytic performance, product distribution, mesoporosity, and crystal size of ZSM-5 zeolites. Both nanocrystal and mesoporous ZSM-5 zeolites displayed long-term catalytic stability compared with the conventional one.  The nanocrystal and mesoporous ZSM-5 catalysts showed high selectivities for light olefins and alkyl aromatics, respectively, in the conversion of methanol to gasoline.  Results indicate that both crystal size and mesoporosity significantly influence the ZSM-5 lifetime and product distribution.

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