III International Conference

PP-II-149ETHANOL CONVERSION ON CKE (H-ZSM-5) CATALYSTSYakimova M.S., Ismayilov I.T., Lermontov A.S., Burdeynaya T.N., Koval L.M. 1 ,Erofeev V.I. 1 , Tretyakov V.F.A.V. Topchiev’s Institute of Petrochemical Synthesis, RAS, Moscow, Russia1 Tomsk State University, Chemical Department, Tomsk, RussiaE-mail: tretjakov@ips.ac.ruThe role of HZSM-5 catalysts structural promoters, Si/Al ratio and doping metal oxideson its activity and selectivity in the process of ethanol conversion to liquid and gaseoushydrocarbons was investigated. The best selectivity to liquid hydrocarbons was reached onthe catalysts, which was synthesized with hexamethylenediamine as the structure formingagent. Mechanochemical doping of CKE catalysts with gallium and iron oxides increases thecatalyst life. Zirconium oxide doped catalyst shows the rapid loss of selectivity to liquidhydrocarbons. The dependence of liquid hydrocarbons selectivity from Si/Al ratio exhibit aminimum which corresponds 2 atoms of alumina per zeolite cage.The process of alcohols conversion to liquid hydrocarbons was investigated in mid-70’smainly for methanol and the process of methanol conversion is used nowadays on industrialscale in New Zealand. Other alcohols can also be converted to the liquid hydrocarbons, butdue to the high market price these processes was not developed. Recently, ethanol attractsmuch interest as a source of hydrocarbons production, because it can be obtained in ecologyfriendly way as a half-product of biomass recycling. This work is devoted to investigation ofCKE (HZSM-5) catalysts structural promoters, Si/Al ratio and doping metal oxides on itsactivity and selectivity in the process of ethanol conversion to liquid and gaseoushydrocarbons (LHC and GHC).CKE catalysts (Si/Al = 50) was synthesized in Tomsk State University using differentstructure forming agents: X-oil, alcohols fraction and hexamethylenediamine – all of them areproducts and reagents in nylon production cycle, and therefore cheaper than thetetrapropylammonium salts conventionally used for zeolites production. All catalysts shown a100% activity in ethanol conversion (WHSV = 10 h -1 , T = 380 o C, p = 3 bar), but theselectivity to liquid hydrocarbons was very low on CKE X-Oil catalysts (99 % ethylene), andalso on CKE alcohol fraction catalyst (90 % ethylene). The catalyst synthesized withhexamethylenediamine as a structure forming agent have shown LHC selectivity near 30 %which is close to the same catalyst synthesized with tetrapropylammonium bromide (28 %).In the further work only catalysts synthesized with hexametylenediamine was used.The influence of oxide CKE promoters was investigated for iron, gallium and zirconiumoxide. The impregnation of zirconium and iron salts on CKE leads to decrease of catalyst438