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Evaluation of the Properties of ZSM-5 Type Zeolites Modified with CexMg1–xAl2O4 Nanopowders in the Toluene Disproportionation Reaction
Petroleum Chemistry  (IF1.029),  Pub Date : 2021-08-04, DOI: 10.1134/s0965544121080041
Kerimli, F. Sh., Ilyasli, T. M., Mammadov, S. E., Akhmedova, N. F., Mammadov, E. S., Makmudova, N. I., Akhmedov, E. I.

Abstract

The effect of CexMg1–xAl2O4 spinel nanopowders on the textural, acidic, and catalytic properties displayed by HZSM-5 zeolite in the toluene disproportionation reaction was examined. Modification with CexMg1–xAl2O4 nanopowders caused a decrease in the concentration of strong protonic sites, formation of new stronger aprotonic sites, and a decrease in the pore volume of HZSM-5, thereby creating more steric hindrance to diffusion of o- and m-xylenes and enhancing para-selectivity of the catalyst. The possibility of achieving high p-xylene selectivity of 65.7–77.3% via toluene disproportionation over the optimal 5% Сe0.1Mg0.9Al2O4/HZSM-5 catalyst at toluene conversion of 20.3–29.7% was demonstrated.