Browsing by Author "Kucuk, M. Masuk"

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Biomass Pyrolysis in a Fixed-Bed Reactor: Effects of Pyrolysis Parameters on Product Yields and Characterization of Products
(Pergamon-elsevier Science Ltd, 2014) Aysu, Tevfik; Kucuk, M. Masuk
Slow pyrolysis of eastern giant fennel (Ferula orientalis L.) stalks has been performed in a fixed-bed tubular reactor with (ZnO, Al2O3) and without catalyst at six different temperatures ranging from 350 degrees C to 600 degrees C with heating rates of 15, 30, 50 degrees C/min. The amounts of bio-char, bio-oil and gas produced, as well as the compositions of the resulting bio-oils were determined by FT-IR and GC-MS. The effects of pyrolysis parameters such as temperature, catalyst and ratio of catalyst, particle size (D-P) and sweeping gas flow rate on product yields were investigated. According to results, temperature and catalyst seem to be the main factors effecting the conversion of F. orientalis L. into solid, liquid and gaseous products. The highest liquid yield (45.22%) including water was obtained with 15% zinc oxide catalyst at 500 degrees C temperature at a heating rate of 50 degrees C/min when 0.224 > D-P > 0.150 mm particle size raw material and 100 cm(3)/min of sweeping gas flow rate were used. (C) 2013 Elsevier Ltd. All rights reserved.
Catalytic Liquefaction of Spirogyra Gratiana Transeau Alga With Supercritical Solvents
(Taylor & Francis inc, 2017) Turhan, Mehmet; Aysu, Tevfik; Calimli, M. Harbi; Kucuk, M. Masuk
Spirogyra gratiana transeau alga was liquefied in organic solvents with and without catalyst in a cylindrical reactor at temperatures of 493, 513, and 533 K under supercritical conditions. The liquefied compounds were extracted with diethyl ether and benzene using an extraction procedure. The product yields in supercritical methanol, ethanol, and acetone were found to be 15.5, 23.7, and 34.4% at 533 K, respectively. The highest conversion to liquid products was obtained in supercritical ethanol with 10% sodium hydroxide as catalyst at the same temperature in the catalytic runs. Main chemical compounds present in the liquid product obtained in acetone without catalyst at 533 K were analyzed and characterized by gas chromatography-mass spectrometry (GC-MS).