Activated carbon-tungstophosphoric acid catalysts for the synthesis of tert-amyl ethyl ether (TAEE)

Obali, Zeynep
Doğu, Timur
Catalytic activities of bulk tungstophosphoric acid (HPW) and its supported forms on activated carbon were investigated in the vapor phase etherification reaction of isoamylene with ethanol in a continuous flow reactor. Tungstophosphoric acid (H3PW12O40 center dot 11H(2)O) was supported on activated carbon having a surface area of 796 m(2)/g, at two different loading levels (25% and 31%) by aqueous impregnation technique and the kinetic experiments were done in a temperature range between 353 and 370 K. Supported HPW catalysts containing the same amount of HPW yielded much higher conversion than bulk HPW at 353 K. Decrease of isoamylene conversion values with an increase in temperature on the supported catalysts was explained by the role of active carbon surface as a reservoir for the reactants. HPW was found to be highly immobilized on the active carbon surface keeping most of its activity after being excessively washed with ethanol. Results also indicated that activity of HPW was higher than the activities of both Amberlyst-15 and another heteropoly acid, namely molybdophosphoric acid.


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Dimethyl ether (DME), which is an excellent green diesel-fuel alternate with excellent clean burning properties, is synthesized by dehydration of methanol over novel solid acid catalysts, which are synthesized following a direct hydrothermal route and using silicotungstic acid (STA) as the active compound. These mesoporous silicate structured catalysts have surface area values of 108-393 m(2)/g, depending upon their W/Si ratio. These catalysts showed very high methanol dehydration activity and also very hig...
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Obalı, Zeynep; Doğu, Timur; Department of Chemical Engineering (2003)
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Activated carbon-supported copper(II) oxide (CuO) nanoparticles were synthesized by simple impregnation method to improve carbon dioxide (CO2) adsorption capacity of the support. The structural and chemical properties of the hybrid material were characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), Xray photoelectron spectroscopy (XPS), atomic absorption spectroscopy (AAS), and Brunauer-Emmett-Teller (BET) analyses. The analyses showed that CuO nanopart...
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VARIŞLI, DİLEK; Korkusuz, Cansu; Doğu, Timur (2017-02-01)
Microwave-assisted ammonia decomposition reaction was investigated to produce COx free hydrogen, for fuel cell applications. Iron incorporated mesoporous carbon catalysts were prepared at different metal loadings, following an impregnation procedure. Mesoporous carbon acted as the catalyst support, as well as the microwave receptor. Complete conversion of ammonia was achieved at 450 degrees C over the catalyst having 7.7 wt% Fe, when the reaction was carried out in the microwave reactor system, using pure a...
Citation Formats
Z. Obali and T. Doğu, “Activated carbon-tungstophosphoric acid catalysts for the synthesis of tert-amyl ethyl ether (TAEE),” CHEMICAL ENGINEERING JOURNAL, pp. 548–555, 2008, Accessed: 00, 2020. [Online]. Available: