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A comparative study of the catalytic nitration of toluene over bimetallic Ce‐Mn modified Hβ zeolite
Ist Teil von
Canadian journal of chemical engineering, 2023-12, Vol.101 (12), p.6807-6816
Ort / Verlag
Hoboken: Wiley Subscription Services, Inc
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Wiley Online Library
Beschreibungen/Notizen
Abstract
Bimetallic cerium‐manganese modified Hβ zeolite sample (Ce/Mn‐Hβ) was prepared by ultrasonic assisted impregnation method and applied in nitration of toluene. The characterization results show that the active components (Ce and Mn) are successfully introduced into the framework of Hβ zeolite. The catalyst shows excellent catalytic activity and reusability for the nitration of toluene, giving high
para
selectivity. Under optimized conditions, it gives 68.7% selectivity to
para
‐nitrotoluene at 88.6% conversion over Ce/Mn‐Hβ in the presence of acetic anhydride (Ac
2
O). The theoretical calculations indicate that the Ce/Mn bimetallic active sites in modified Hβ zeolite can easily activate the nitrification reagent (AcONO
2
), and the enhancement of para selectivity is owing to the steric hindrance of catalyst. Furthermore, the reaction mechanism was proposed by the combination of experimental results and theoretical calculations.