Production of High-Octane Gasolines from Bioethanol on Zn-Modified HZSM-5 Zeolite

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 of 350 to 450°C is studied. Based on the IR spectroscopy data, it is shown that an increase in the...

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Bibliographic Details
Published in:Moscow University chemistry bulletin 2022-08, Vol.77 (4), p.222-229
Main Authors: Mamedov, E. S., Babaeva, B. A., Mamedov, S. E., Akhmedova, N. F., Kerimli, F. S.
Format: Article
Language:English
Subjects:
Benzene
Biofuels
Catalysts
Catalytic converters
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Ethanol
Infrared spectroscopy
Motor fuels
Octane
Selectivity
Zeolites
Zinc
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Summary: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 of 350 to 450°C is studied. Based on the IR spectroscopy data, it is shown that an increase in the zinc content in the zeolite from 1.0 to 3.0 wt % leads to a redistribution of the acid sites, i.e., to a decrease in the concentration of strong Brønsted acid sites (B) and an increase in the concentration of medium strength Lewis ones (L) (a decrease in the B/L ratio 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%) has been achieved on the zeolite containing 2.0 wt % of zinc and 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 (
ISSN:0027-1314
1935-0260
DOI:10.3103/S002713142204006X