High effective dehydration of bio-ethanol into ethylene over nanoscale HZSM-5 zeolite catalysts |
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Authors: | Jiandong Bi Xinwen Guo Min Liu Xiangsheng Wang |
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Affiliation: | 1. Faculty of Chemistry, Jagiellonian University in Kraków, 2 Gronostajowa St., 30-387 Kraków, Poland;2. Jerzy Haber Institute of Catalysis and Surface Chemistry PAS, Niezapominajek 8, Kraków, Poland |
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Abstract: | Nanoscale and microscale HZSM-5 zeolite catalysts were prepared and characterized by using SEM, XRD, IR, TPD and modified Hammett indicator method. Their performances in the dehydration of bio-ethanol into ethylene were compared in a fixed-bed reactor at 240 °C under atmospheric pressure. The results show that nanoscale HZSM-5 zeolite catalyst exhibits better stability than microscale HZSM-5 zeolite catalyst. When the 95(v) % bio-ethanol is used as the reactant, over nanoscale HZSM-5 catalyst, the conversion of bio-ethanol and the selectivity for ethylene almost keep constant during 630 h reaction, while over microscale HZSM-5 zeolite catalyst, the conversion of bio-ethanol decreases after 60 h reaction; in the case of the 45(v) % bio-ethanol employed as the feedstock, over nanoscale HZSM-5 catalyst, the conversion of bio-ethanol and the selectivity for ethylene almost keep constant during 320 h reaction, while over microscale HZSM-5 zeolite catalyst, both the conversion of bio-ethanol and the selectivity for ethylene decrease almost at the beginning of the reaction. |
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