DAN, MAFTEI,IULIEAN VASILE ASAFTEI, ION SANDU, LILIANA ROZEMARIE MANEA, LUCIAN MIHAIL BIRSA, KAMEL EARAR<br>Conversion of Industrial Feedstock mainly with Butanes <br>and Butenes over HZSM-5 and Zn/HZSM-5 (nitrate) Catalysts <br><br>

DAN, MAFTEI,IULIEAN VASILE ASAFTEI, ION SANDU, LILIANA ROZEMARIE MANEA, LUCIAN MIHAIL BIRSA, KAMEL EARAR
Conversion of Industrial Feedstock mainly with Butanes
and Butenes over HZSM-5 and Zn/HZSM-5 (nitrate) Catalysts

Abstract:

The activity and selectivity in the aromatization of C4/C4= hydrocarbons on Zn/HZSM-5 (wt% 1.39 Zn) (nitrate) prepared by ion exchange compared with that on HZSM-5 was been investigated. The experimental results show that the conversion of hydrocarbons and the selectivity to aromatics BTX on the bifunctional Zn/HZSM-5 (nitrate) catalyst are higher than that on monofunctional HZSM-5. On HZSM-5, protons (Bronsted acid sites) and on Zn/HZSM-5, both Zn cations and protons intervene in alkanes dehydrogenation and further in dehydrocyclo-oligomerization reactions that form C6-C9 aromatics. In the liquid product, the aromatics represent an average value of 30 wt%, with more xylenes, on HZSM-5 catalyst after 24 h time on stream at 450oC and 8 atm., and ~70 wt% with more toluene, on Zn/HZSM-5 catalyst, after 52h time on stream at 450oC and atmospheric pressure. The aromatization process is accompanied by oligomerization (more C9-C10 and ]C10 aliphatic hydrocarbons) especially on HZSM-5 catalyst. Keywords: aromatization, butanes, butenes, zinc exchanged HZSM-5

Issue: 2015, Volume 66, Issue 5

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