Li̇gnoselülozi̇k bi̇yokütle yapisindaki̇ hemi̇selüloz ve ekstrakti̇f maddeleri̇n süperkri̇ti̇k su i̇le gazlaştirilmasindaki̇ davranişlarinin bazi model bi̇leşi̇kler yardimi i̇le i̇ncelenmesi̇

Production of Hydrogen and Methane which are used as clean energy sources by hydrothermal gasification from the lignocellulosic biomasses is a novel and developing technology. Cellulose, lignin, hemicelluloses, and extractive substances show different attitudes in hydrothermal gasification. For this reason, significant varieties are observed in the gasification yields and product distributions. In a research of literature, it was found that, there is not enough work being carried out with the hemicelluloses and extractives which are approximately 1/3 of a plant, and this is a significant deficiency in literature. From this point, in this study, xylose, arabinose, and pectin as model compounds for the hemicellulose, whereas tannic acid, gallic acid, phloroglucinol, and pyrogallol for extractives were studied. The yields of gas, liquid, and solid products were identified with the analyses using GC, HPLC, TOC, and SSM. The effect of the reaction temperature, the reaction pressure, and catalyst were investigated to reach the maximum yields of H2 and CH4. As the reaction temperature increased, the gaseous product yield and the amount of H2 and CH4 in unit of mol increases. The increment in reaction pressure causes a decrease in the gaseous product yield and the amount of H2 in mol, on the other hand it promotes the CH4 amount in mol.