PubMed İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.14720/6
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Browsing PubMed İndeksli Yayınlar Koleksiyonu by Institution Author "Aysu, Tevfik"
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Article Catalytic Pyrolysis of Alcea Pallida Stems in a Fixed-Bed Reactor for Production of Liquid Bio-Fuels(Elsevier Sci Ltd, 2015) Aysu, TevfikPyrolysis of Alcea pallida stems was performed in a fixed-bed tubular reactor with and without catalyst at three different temperatures. The effects of pyrolysis parameters including temperature and catalyst on the product yields were investigated. It was found that higher temperature resulted in lower liquid (bio-oil) and solid (bio-char) yields and higher gas yields. Catalysts had different effects on product yields and composition of bio-oils. Liquid yields were increased in the presence of zinc chloride and alumina but decreased with calcium hydroxide, tincal and ulexite. The highest bio-oil yield (39.35%) by weight including aqueous phase was produced with alumina catalyst at 500 degrees C. The yields of bio-char, bio-oil and gas produced, as well as the compositions of the resulting bio-oils were determined by elemental analysis, TGA, FT-IR and GC-MS. 160 different compounds were identified by GC-MS in the bio-oils obtained at 500 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.Article A Study on Pyrolysis of Canada Thistle (Cirsium Arvense) With Titania Based Catalysts for Bio-Fuel Production(Elsevier Sci Ltd, 2016) Aysu, TevfikThe catalytic pyrolysis of Cirsium arvense was performed with titania supported catalysts under the operating conditions of 500 degrees C, 40 degrees C/min heating rate, 100 mL/min N-2 flow rate in a fixed bed reactor for biofuel production. The effect of catalysts on product yields was investigated. The amount of pyrolysis products (bio-char, bio-oil, gas) and the composition of the produced bio-oils were determined by proton nuclear magnetic resonance (H-1 NMR), Fourier transform infrared spectroscopy (FT-IR), gas chromatography/mass spectrometry (GC-MS) and elemental analysis (EA) techniques. Thistle bio-oils had lower O/C and H/C molar ratios compared to feedstock. The highest bio-char and bio-oil yields of 29.32 wt% and 36.71 wt% were obtained in the presence of Ce/TiO2 and Ni/TiO2 catalysts respectively. GC-MS identified 97 different compounds in the bio-oils obtained from thistle pyrolysis. H-1 NMR analysis showed that the bio-oils contained similar to 55-77% aliphatic and similar to 6-19% aromatic structural units. (C) 2016 Elsevier Ltd. All rights reserved.
