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Revista de Chimie (Rev. Chim.), Year 2014, Volume 65, Issue 4,





IULEAN ASAFTEI, NICOLAE BILBA, ION SANDU
Conversion of Butanes and Butenes from Industrial Feedstock
over Zn-HZSM-5(acetate) Catalyst

Abstract:

The activity and selectivity of Zn/HZSM-5 (wt% 0, 77 ZnO) catalyst prepared by ion exchange with solution of zinc acetate in the aromatization of C4/C4= hydrocarbons was investigated. The experimental results showed that the conversion of C4/C4= hydrocarbons on the bifunctional Zn-HZSM-5 (acetate) catalyst and the selectivity to aromatics BTX are higher than that on monofunctional HZSM-5, but lower than on Zn/HZSM-5 (nitrate). On HZSM-5, protons (Bronsted acid sites) and on Zn-HZSM-5, both Zn cations and protons are responsible to alkanes dehydrogenation and further in dehydrocycloaromatization reactions that form C6-C8 aromatics. In the liquid product, on HZSM-5 catalyst at 450oC and 8 atm., after 24h time on stream the aromatics represented an average of 30 wt%, with more xylenes and toluene. On Zn/HZSM-5 (acetate) catalyst, at 450oC and 4 atm., after 176h time on stream, the aromatics represented more than 46 wt% with more toluene and aromatics C8. The aromatization process is accompanied by the oligomerization of C4/C4= hydrocarbons (more C9-C10 and ]C10 aliphatic hydrocarbons) especially on HZSM-5 catalyst. Keywords: aromatization, butanes, butenes, HZSM-5, Zn/HZSM-5 (acetate)


Issue: 2014, Volume 65, Issue 4
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