Ethylene and diethyl-ether production by dehydration reaction of ethanol over different heteropolyacid catalysts

Varisli, Dilek
Doğu, Timur
Dogu, Gulsen
Dehydration reaction of ethanol was investigated in a temperature range of 140-250 degrees C with three different heteropolyacid catalysts, namely tungstophosphoricacid (TPA), silicotungsticacid (STA) and molybdophosphoricacid (NIPA). Very high ethylene yields over 0.75 obtained at 250 degrees C with TPA was highly promising. At temperatures lower than 180 degrees C the main product was diethyl-ether. Presence of water vapor was shown to cause some decrease of catalyst activity. Results showing that product selectivities did not change much with the space time in the reactor indicated two parallel routes for the production of ethylene and DEE. Among the three HPA catalysts, the activity trend was obtained as STA > TPA > MPA.


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Varisli, Dilek; Doğu, Timur; DOĞU, GÜLŞEN (2010-01-01)
Very high ethylene selectivity values approaching 100% and very high ethanol conversion values approaching 85% were obtained in dehydration of ethanol over a new W-silicate-based nanocomposite catalyst having both meso and macropores and containing a W/Si atomic ratio of 0.85. Silicotungsticacid was successfully incorporated into the catalyst structure following a one-pot hydrothermal synthesis procedure. This catalyst is highly stable and does not loose activity in polar solvents and it has a sufficiently ...
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Agglomerative sintering of an atomically dispersed, zeolite Y-supported catalyst, Ir-1/zeolite Y, formed initially from the well-characterized precatalyst [Ir(C2H4)(2)]/zeolite Y and in the presence of liquid-phase reactants, was monitored over three cycles of 3800 turnovers (TTOs) of cyclohexene hydrogenation at 72 degrees C. The catalyst evolved and sintered during each cycle, even at the relatively mild temperature of 72 degrees C in the presence of the cyclohexene plus H-2 reactants and cyclohexane solv...
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Ay, Hale; Üner, Deniz (2015-12-01)
Ceria supported Ni, Co monometallic and Ni-Co bimetallic catalysts were prepared by incipient wetness impregnation method, calcined at two different temperatures (700 degrees C and 900 degrees C) and tested for dry reforming of methane reaction at 700 degrees C. The activities of ceria-based Ni containing catalysts decreased with increasing calcination temperature accompanied by a decrease in coke deposition. While Ni/CeO2 and Ni-Co/CeO2 catalysts exhibited comparable high activities, Co/CeO2 catalysts exhi...
Ethylene and acetaldehyde production by selective oxidation of ethanol using mesoporous V-MCM-41 catalysts
Gucbilmez, Yesim; Doğu, Timur; Balci, Suna (2006-05-10)
Vanadium-incorporated MCM-41 type catalytic materials, which were synthesized by a direct hydrothermal synthesis procedure, showed very high activity and high selectivity in the production of ethylene from ethanol in an oxidative process. Ethylene selectivity showed a significant increase with an increase in temperature over 300 degrees C, while relatively high acetaldehyde selectivities were observed at lower temperatures. An ethylene yield value of 0.66 obtained at 400 degrees C with an O-2/ethanol feed r...
Hydrothermal synthesis of 3D TiO2 nanostructures using nitric acid: Characterization and evolution mechanism
Erdogan, Nursev; Öztürk, Abdullah; Park, Jongee (Elsevier BV, 2016-4)
Various morphologies of TiO2 nanostructures were synthesized by HNO3 assisted hydrothermal treatment with respect to the acid molarity (1 M, 3 M, and 8 M), temperature (110, 140, and 180 degrees C), and time (1, 3, and 6 h). An additional sample was synthesized inside the protonated titanate nanoribbon coated vessel with the acid molarity of 8M at 140 degrees C for 3 h. The crystal structure and morphology of the nanostructures synthesized were investigated using X-Ray diffractometer, scanning electron micr...
Citation Formats
D. Varisli, T. Doğu, and G. Dogu, “Ethylene and diethyl-ether production by dehydration reaction of ethanol over different heteropolyacid catalysts,” CHEMICAL ENGINEERING SCIENCE, pp. 5349–5352, 2007, Accessed: 00, 2020. [Online]. Available: