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Effect of Si/Al ratio and of acidity of H‐ZSM5 zeolites on the primary products of methanol to gasoline conversion
Author(s) -
Benito Pedro L.,
Gayubo Ana G.,
Aguayo Andreś T.,
Olazar Martin,
Bilbao Jarier
Publication year - 1996
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199606)66:2<183::aid-jctb487>3.0.co;2-k
Subject(s) - chemistry , zeolite , oxonium ion , propene , methanol , reaction mechanism , gasoline , catalysis , adsorption , decomposition , phase (matter) , fourier transform infrared spectroscopy , inorganic chemistry , organic chemistry , ion , chemical engineering , engineering
From experiments in a chromatographic reactor, under conditions of incipient reaction, the effect of the Si/Al ratio of H‐ZSM5 zeolites on the nature of the primary products has been proven in the transformation of methanol into gasoline. It has been determined that alkenes (ethene, propene and butenes) are the first reaction products, the proportion of heavier alkenes being greater as the Brönsted/Lewis ratio increases and as total acidity decreases (decrease in acidic site density). By in‐situ FTIR analysis of the adsorbed phase, the presence of surface methoxy groups has been determined. By virtue of the results, a mechanism of propagation–decomposition of oxonium ions has been proposed. This mechanism basically occurs in a phase adsorbed on the zeolite and explains the formation of the first CC bond and the presence in the gas phase of the first products according to a reaction–diffusion compromise for each one of the intermediate products of the mechanism.