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Revista de Chimie (Rev. Chim.), Year 2016, Volume 67, Issue 4,



Iuliean Vasile Asaftei, Kamel Earar, Neculai Catalin Lungu, Lucian-Mihail Birsa, Maria Ignat, Valentin Plesu, Ioan Gabriel Sandu

Comparative Study Beetween Zn - Cu- HZSM-5 and Zn-HZSM-5 (Acetate) Catalysts in Conversion of C4 - C4= Technical Fraction

Abstract:

The catalytic activity and product distribution over Zn-Cu-HZM-5, Zn-HZSM-5 (acetate) and HZSM-5 catalysts during the C4 - C4= conversion, have been studied. The experimental results show that the conversion of hydrocarbons and the selectivity to aromatics BTX on the Zn-Cu-HZSM-5 catalyst are higher than that on Zn-HZSM-5 (acetate) and on HZSM-5. On HZSM-5, protons (Bronsted acid sites), on Zn-HZSM-5 (acetate), and on Zn-Cu-HZSM-5, both Zn2+and Zn2+/ Cu2+ cations and protons intervene in alkanes dehydrogenation and further in dehydrocyclooligomerization reactions that form C6-C8 aromatics; the aromatic products (principally toluene, xylenes and benzene) concentration of liquid products varied with the time on stream of the process. Product distributions at 450oC indicated that Zn-Cu-HZSM-5 and Zn-HZSM-5(acetate) exhibited higher aromatization activities compared with oligoaromatization activity of HZSM-5. Meanwhile the time on stream increases from 24h on HZSM-5 to over 70h on bifunctional catalysts and the resulted gases contain hydrogen.

Keywords:
aromatization; Zn-HZSM-5 (acetate); Zn-Cu-HZSM-5; C4 - C4= technical fraction

Issue: 2016, Volume 67, Issue 4
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