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Eyyub S. Mamedov, Bahar A. Babaeva, Sabit E. Mamedov, Nargiz F. Akhmedova, Fuad S. Kerimli
Production of high-octane
gasoline from bioethanol on zinc-modified HZSM-5 zeolite
Abstract
Abstract. The influence of the concentration of zinc introduced into HZSM-5 on
its acidic and catalytic properties in the conversion of ethanol into
high-octane components of motor fuels in the
temperature range 350–450 °C has been studied. Based on the data of IR
spectroscopy, it was shown that with an increase in the zinc content in the
zeolite from 1.0 to 3.0 wt. %, a redistribution of acid sites occurs – a
decrease in the concentration of strong Bronsted acid sites (B) and an increase
in the concentration of Lewis acid sites (L) of the average strength (decrease
in the ratio of B/L-acid sites from 3.53 to 0.44). All this has a decisive
influence on the isomerizing and aromatizing selectivity of the catalyst. The
maximum selectivity for isoparaffins (43.9%) is achieved with a zeolite
containing 2.0 wt. % zinc with a B/L ratio of 0.66. The catalyst obtained at
300–350°C corresponds to the Euro-5 standard in terms of the content of benzene
(<1.0 wt. %), aromatic (<30.0 wt. %), and olefinic (<2.0 wt. %).
Key words: ethanol,
conversion, selectivity, ZSM-5 zeolite, zinc, isomerization, cracking,
aromatization
Copyright (C) Chemistry Dept., Moscow State University, 2002
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