Browsing by Author "Genel, S."

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Biyokütlenin Heterojen Katalizör Varlığında Katalitik Hidrotermal Sıvılaştırma Yöntemi İle Sıvılaştırılması Ve Elde Edilen Ürünlerin Karakterizasyonu
(Gumushane University, 2023) Genel, S.
Biomass can be converted into more valuable forms of energy by many thermal, biological and physical methods. While energy can be obtained by direct combustion of biomass, solid, liquid and gaseous fuels can be obtained from biomass by various thermochemical conversion methods (Hydrothermal liquefaction, pyrolysis and gasification). Hydrothermal liquefaction is one of the thermochemical processes used to convert biomass into liquid products with high energy content. Various catalysts (homogeneous and heterogeneous) can be used in the hydrothermal liquefaction process. It has been stated in the relevant literature that heterogeneous catalysts have various advantages such as recovery and obtaining liquid products with low oxygen content. In this study, the stem of Glycyrrhiza glabra L. (Liquorice) plant is liquefied for the first time in the presence of Al and Fe metal powders catalyst. In the trials, 300, 325 and 350 °C temperature and 30 minutes waiting time parameters are determined. GC–MS and elemental analysis methods are used for the characterization of the products. For light bio-oil and heavy bio-oil, the optimum temperature was 325°C and the highest energy value was 32.01 Mj/kg in the presence of Fe catalyst. Heterogeneous catalyst is found to be effective in the liquefaction of Glycyrrhiza glabra L. plant. © 2023, Gumushane University. All rights reserved.
Xanthium Strumarium L. Bitkisinin Co/TiO2, Mn/TiO2 ve Co+Mn/TiO2 Katalizörleri Varlığında Hidrotermal Yöntemle Sıvılaştırılması
(Gumushane University, 2024) Genel, S.
Hydrothermal liquefaction (HTL) is the process of liquefying biomass under high pressure and temperature and is widely used to provide environmentally friendly energy and material conversion. In the HTL process, the selection of the right catalysts is critical to increase process efficiency and obtain products with high energy value. For this purpose, in this study, Co/TiO2, Mn/TiO2 and Co+Mn/TiO2 catalysts were synthesized, characterized by analysis methods such as SEM, SEM-EDX, XPS and ICP-OES and used in the HTL process of the Xanthium strumarium plant. The reaction temperature in HTS was determined as 275, 300 and 325 °C and the waiting time was determined as 30 minutes. At the end of the experiments, it was observed that the experiments with catalysts increased the amount of liquid product. Elemental and GC-MS analyzes of the obtained liquid products were performed. The highest energy value was obtained in the presence of the Mn/TiO2 catalyst. © 2024, Gumushane University. All rights reserved.