Bilgilendirme: Sürüm Güncellemesi ve versiyon yükseltmesi nedeniyle, geçici süreyle zaman zaman kesintiler yaşanabilir ve veri içeriğinde değişkenlikler gözlemlenebilir. Göstereceğiniz anlayış için teşekkür ederiz.

OpenAIRE Collection / OpenAIRE Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/11147/17

Browse

Browsing OpenAIRE Collection / OpenAIRE Koleksiyonu by Journal "Fuel Processing Technology"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Article
    Citation - WoS: 33
    Citation - Scopus: 37
    Steam Gasification of Safflower Seed Cake and Catalytic Tar Decomposition Over Ceria Modified Iron Oxide Catalysts
    (Elsevier Ltd., 2014-10) Duman, Gözde; Watanabe, Taichi; Uddin, Md Azhar; Yanık, Jale
    Catalytic steam gasification of safflower seed cake was carried out using a double-bed microreactor in a two-stage process in the presence of ceria oxide (CeO2) modified iron oxide (Fe2O3) catalysts with different CeO2-Fe2O3 ratios. The effects of both catalyst and the temperature of catalytic bed on the tar decomposition and the overall gaseous product yield were investigated comparatively. It was found that ceria modified iron oxide catalysts had higher reactivity than that of the individual Fe2O3 and CeO2 for the catalytic tar decomposition in safflower seed cake steam gasification. The CeO2-Fe2O3 catalyst with 50 wt.% of Fe 2O3 exhibited the excellent performance for tar conversion at 700 °C. A comparison of tar decomposition from thermal run and catalytic run showed that in thermal run tar decomposition was progressed via steam reforming only. However, in the presence of catalyst, tar decomposition occurred via both steam reforming and water gas shift reaction. As a conclusion, ceria promoted iron catalysts were found to be active for both hydrogen production and tar decomposition in steam gasification of lignocellulosic biomass.
  • Thumbnail Image
    Article
    Citation - WoS: 19
    Citation - Scopus: 22
    Valorization of Hazelnut Shell Waste in Hot Compressed Water
    (Elsevier Ltd., 2017) Gözaydın, Gökalp; Yüksel Özşen, Aslı; Yüksel, Aslı; 03.02. Department of Chemical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Hydrothermal conversion of waste hazelnut shell in hot compressed water, green and environmentally friendly medium, was investigated under different operating conditions to clarify the effects of reaction temperature, reaction time, acid concentration and acid kind (H2SO4 and H3PO4) on the production of value-added chemicals with high temperature/high pressure autoclave. In literature, to our best knowledge, there is no study about the production of levulinic acid, as a high value chemical, from waste hazelnut shell in hot-compressed water without using any mineral and heterogeneous catalyst. Hydrothermal reactions were conducted at 150–280 °C for reaction times of 15 to 120 min with various H2SO4 and H3PO4 concentrations varying from 0 to 125 mM. The detailed liquid product species were identified with High Performance Liquid Chromatography (HPLC) and gaseous products were analyzed by Gas Chromatography with a Thermal Conductivity Detector (GC-TCD). The main identified liquid compounds were levulinic acid, acetic acid and furfural while carbon dioxide and carbon monoxide were the major gaseous products. Increasing the reaction temperature (280 °C) and reaction time (120 min) resulted in a significant increment on the conversion (65.40%) as well as levulinic acid yield (13.05%). The production of levulinic acid was enhanced with H2SO4 addition; whereas treatments with H3PO4 improved the furfural production.