Peculiarities of dehydroaromatization of CHSubscr

Authors: Ekaterina V Matus Olga B Sukhova Ilyas Z Ismagilov Lidiya T Tsikoza Zinfer R Ismagilov

Publish Date: 2009/09/02

Volume: 98, Issue: 1, Pages: 59-67

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Abstract

The peculiarities of dehydroaromatization DHA of a CH4–C2H6 mixture over 1–10 Mo/ZSM5 catalysts Si/Al = 17 30 45 were studied in comparison with reactions of individual hydrocarbons For a 90 vol CH4 + 10 vol Ar mixture the methane conversion passes through a maximum and decreases with the timeonstream being about 12 after 6 h Experiments with a mixture 85 vol CH4 + 5 vol C2H6 + 10 vol Ar demonstrated that the presence of ethane leads to the suppression of the methane conversion practically to zero and to an increase in the benzene formation rate in comparison with the CH4 + Ar mixture Characterization of the spent Mo/ZSM5 catalysts by DTA and TGA showed that both the condensation degree of the carbonaceous deposits C/H ratio and their content are higher in the presence of ethane For both feed compositions the maximal benzene formation rate was observed over the catalyst with 2 wt Mo and Si/Al = 17 It is proposed that the formation of C2 intermediates from methane and their further transformations in DHA compete with the ethane aromatization presumably on the same Mo active sites

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