Special Features of Cyclohexane Cracking over Dual-Zeolite Catalysts in the Presence of Sulfur and Nitrogen Compounds

Conversions of cyclohexane and cyclohexane mixtures with 2-methylthiophene (5000 ppm S) and pyrrole (500 ppm N) over dual-zeolite cracking catalysts have been studied. The catalysts have been synthesized using zeolites Y in the HREE form and ZSM-5 modified with phosphorus. The effect of conditions (...

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Bibliographic Details
Published in:Petroleum chemistry 2020-04, Vol.60 (4), p.490-498
Main Authors: Potapenko, O. V., Plekhova, K. S., Gaifullina, E. V., Yurtaeva, A. S., Sorokina, T. P., Doronin, V. P.
Format: Article
Language:English
Subjects:
Alkenes
Catalysts
Chemical synthesis
Chemistry
Chemistry and Materials Science
Cyclohexane
Dilution
Industrial Chemistry/Chemical Engineering
Nitrogen compounds
Olefins
Rare gases
Selectivity
Sulfur
Sulfur compounds
Zeolites
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Summary:Conversions of cyclohexane and cyclohexane mixtures with 2-methylthiophene (5000 ppm S) and pyrrole (500 ppm N) over dual-zeolite cracking catalysts have been studied. The catalysts have been synthesized using zeolites Y in the HREE form and ZSM-5 modified with phosphorus. The effect of conditions (temperature in a range of 510–630°C, dilution ratio of the reaction medium with an inert gas up to 2 : 1 mol/mol) on the cracking product composition has been studied. It has been shown that an increase in temperature and the dilution ratio of the reaction medium contributes to an increase in the light olefin yield. The highest yield of C 2 –C 4 olefins (40 wt %) has been achieved over a catalyst with an Y : ZSM-5 zeolite ratio of 1 : 3. The presence of sulfur and nitrogen compounds leads to a decrease in the feedstock conversion and an increase in the light olefin selectivity.
ISSN:0965-5441
1555-6239
DOI:10.1134/S0965544120040131