Conversion of Methanol to Hydrocarbons over ZSM-5 Zeolite: An Examination of the Role of Aromatic Hydrocarbons Using 13Carbon and Deuterium Labeled Feeds

来自 dx.doi.org

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174

作者：

T Mole，G Bett，D Seddon

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摘要：

A mechanism is suggested for the acceleration by aromatic hydrocarbons of zeolite-catalyzed methanol conversion. According to this mechanism, the aromatic hydrocarbon undergoes successive ring methylation, prototropic conversion to an exo-methylene-cyclohexadiene, side-chain methylation, and ring de-ethylation. The overall result is that two methanol molecules give an ethylene molecule. The mechanism is supported by various reactions observed over ZSM-5 catalyst at methanol conversion temperatures: (i) deuteration of p-xylene by D 2O in the ring and methyl positions; (ii) de-alkylation of p-ethyltoluene and n-propylbenzene; and (iii) incorporation of the aromatic carbon of benzenes and alkylbenzenes into ethylene product, as revealed by 13C-labeling studies.

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关键词：

synthetic fuels methylpropane synthesis ethylene methanol chemical reactions propane zeolites catalytic effects aqueous solutions