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- W173860905 abstract "Abstract The temporal changes of selectivity and rate of methanol conversion to hydrocarbons on the zeolites HZSM5, HY and H-Beta have been studied. With the zeolite HZSM5 at low temperature (270°C), kinetic regimes of initiation, acceleration and retardation were observed. During initiation, the zeolite pores collect first reactive hydrocarbons. Dehydrogenation of this retainate performs with methanol as the reactant, methane being the hydrogen-rich co-product. During acceleration, the rate of methanol conversion increases drastically, because of reactive retainate accumulation in the pores, and during retardation conversion decreases, as caused by ample pore filling with molecules which are too big to diffuse sufficiently fast to allow their escape from the pore system. With increasing temperature, up to 400°C, reanimation of the HZSM5 is noticed. The at low temperature deactivating retainate undergoes cracking reactions at higher temperature. Stable bigger species, as multi-ring aromatics — and the more coke — are not formed, because of spatial constraints. At high temperature (475°C), the HZSM5 deactivates slowly. Coke is formed on the crystallite surfaces by methylation and dehydrogenation of “coke seeds”. Spatial constraints in the HZSM5 pores allow no big molecules to form, and larger molecules of the reaction mixture do not accumulate, as they are in “pseudo equilibrium” with smaller ones. With the zeolite HY at 475°C, coke selectivity is high. The HY-super-cages can host multi-ring aromatics. Coke methylation and coke dehydrogenation are finally the only methanol reactions. With the zeolite H-Beta, the behavior is intermediate when comparing with the zeolites HZSM5 and HY. The composition of the volatile aromatics is unique, as even hexamethyl-benzene is obtained.220" @default.
- W173860905 created "2016-06-24" @default.
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- W173860905 date "2004-01-01" @default.
- W173860905 modified "2023-10-18" @default.
- W173860905 title "Regimes of methanol conversion on zeolites" @default.
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- W173860905 doi "https://doi.org/10.1016/s0167-2991(04)80469-5" @default.
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