US EPA

4274226 

Journal Article 

Comparative Study Beetween Zn - Cu- HZSM-5 and Zn-HZSM-5 (Acetate) Catalysts in Conversion of C-4 - C-4 = Technical Fraction 

Asaftei, IV; Earar, K; Lungu, NC; Birsa, LM; Ignat, M; Plesu, V; Sandu, IG 

2016 

1 

Revista de Chimie
ISSN: 0034-7752
EISSN: 2668-8212 

67 

4 

734-740 

WOS:000376549200030 

The catalytic activity and product distribution over Zn-Cu-HZM-5, Zn-HZSM-5 (acetate) and HZSM-5 catalysts during the C-4 - C-4(=) 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 C-6 - C-8 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 450 degrees C 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. 

aromatization; Zn-HZSM-5 (acetate); Zn-Cu-HZSM-5; C-4 - C-4(=) technical fraction