Effect of steam treatment on catalytic performance of HZSM-5 catalyst for ethanol dehydration to ethylene

Catalytic Ethanol Dehydration to Ethylene over Nanocrystalline χ- and γ-Al₂O₃ Catalysts

“…The yield towards ethylene increased with rising reaction temperature, while the yield towards diethyl ether apparently decreased Table 6 . At low temperature, ethanol dehydration is predominantly a bimolecular reaction whilst the unimolecular reaction route prevails at high temperature 30 . On the contrary, the mechanism of ethylene formation has been expected from the decomposition of diethyl ether at higher temperature 31,32 .…”

Effect of HCl Loading and Ethanol Concentration over HCl-Activated Clay Catalysts for Ethanol Dehydration to Ethylene

“…As seen in these figures, the results appear to be in agreement with the role of ethanol dehydration. For the ethanol dehydration, there are two competitive pathways containing the main path involves the formation of ethylene which occurs via intramolecular that is endothermic and another one, inter-molecular dehydration to diethyl ether, is exothermic 2,5,30 , which is directly corresponding to the equation I and II as mentioned above. In case of ethylene Fig.…”

Modeling and Simulation of the Process of Dehydration of Bioethanol to Ethylene

“…The studies in the literature on the transformation of bioethanol into olefins give emphasis to the selective production of ethylene by dehydration, using mainly zeolites HZSM-5, which are effective at temperatures below 300 °C, and catalyst modifications to moderate the strength of the acid sites to avoid secondary reactions of conversion of ethylene and to mitigate the formation of coke. The production of propylene occurs by the conversion of ethylene through a mechanism of oligomerization-cracking that requires temperatures above 350 °C, favoring also the reactions of coke formation and the consequently catalyst deactivation (Sheng et al, 2013). The intramolecular ethanol dehydration, which produces ethylene, is an endothermic and reversible reaction, and the intermolecular dehydration, which produces diethyl ether, is an exothermic and reversible reaction.…”