Collect. Czech. Chem. Commun. 1992, 57, 2553-2560

Aromatization of C2-C6 Aliphatic Hydrocarbons on Copper-Containing ZSM-5 Zeolites

Zdravka Popovaa, Katia Aristirovab and Christo Dimitrova

a Faculty of Chemistry, University of Sofia, Sofia 1126, Bulgaria
b Institute of Kinetics and Catalysis, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria


The aromatization of a wide range of model aliphatic and cycloaliphatic hydrocarbons (ethene, ethane, propene, n-hexane, 1-hexene, methylcyclopentane, cyclohexane, cyclohexene) on copper-containing NaZSM-5 and HZSM-5 zeolites has been investigated. It was established that the degree of aromatization is related to carbenium ion formation and depends on the acid strength and copper content of zeolite. Experiments with copper-containing samples reduced prior to use indicated the possibility to enhance the selectivity to aromatization. The change of the state of Cu2+ ions during catalytic experiments confirmed the assumption about participation of Cu0 simultaneously with the Bronsted acid centers in the dehydrogenation/hydrogenation steps.