GCRIS

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Desing and Production of Light-Weight Pressure Resistant Composite Tank Materials and Systems for Hydrogen Storage
(Izmir Institute of Technology, 2020) Kartav, Osman; Tanoğlu, Metin
This thesis focuses on the development of high-pressure resistant composite tanks for hydrogen storage. For this aim, composite tanks with aluminum liners were designed and manufactured by filament winding technique with various lay-up configurations and tested. The main objective of this study was to develop composite tanks with 700 bar working pressure and 1400 bar burst pressure. Furthermore, composite doily layers were incorporated into the filament winding technique and inserted at the front and end dome sections of the composite tanks to improve the burst pressure performance of the composite tanks and to develop the manufacturing process. Before the manufacturing process, the winding simulations were completed using CADWINDTM CAM software. The manufactured composite tanks were hydrostatically loaded with increasing internal pressure up to the burst pressure. During loading, the deformations over the composite tanks and liners were measured locally using strain gauges. Besides, composite plates were manufactured by filament winding technique to determine the mechanical and the thermo-mechanical properties, and the fiber mass fractions of composite sections were determined. Additionally, a preliminary study was carried out to investigate the effect of hybrid fiber usage on the burst pressure performance of steel liner based composite tanks. The effect of filament winding parameters on the burst pressure performance of composite tanks was investigated experimentally. The aimed burst pressure value of more than 1400 bar was obtained in this study for aluminum liner-based carbon fiber reinforced composite tanks. Also, a desired safe burst mode that is expected to occur in the mid-region of the composite tanks was successfully obtained. This study may be useful for the development of composite tanks for high-pressure hydrogen storage especially for the automotive industry and can be helpful to decrease the usage of fossil fuels.
Hydrogen Production From Biomass on Structured Catalysts
(Izmir Institute of Technology, 2012) Umdu, Emin Selahattin; Şeker, Erol
The objective of this study is to investigate crystallite-size effect for oxides of transition metals iron supported on magnesium oxide (MgO) and cerium oxide (CeO2) modified alumina (Al2O3) and the effect of the basicity and/or basic strength of support material, on activity and hydrogen selectivity in the steam reforming of glycerol. Crystallite size effect is observed for MgO and Fe on MgO/Al2O3. It is observed that larger MgO crystallites size shifts gaseous product selectivity towards CO. Further as crystallite size is becomes higher than ~5 nm for Fe for gas product selectivity decreases. Basisity has also a similar behaviour; higher basisity or presence of unidentate carbonate basic sites observed at 865 and 800 cm-1 FTIR bands for CeO2 promoted catalysts hinder CO formation and promotes CO2 formation. This also results in high activity of steam reforming. Also basisity studies shows that inorganic carboxylate catalyst site with FTIR band 1535 and 1410 cm-1 is dominantly effective for gaseous product selectivity. High total basisity do not required for high glycerol conversion, yet high total basisity results in high gaseous product selectivity. Considering studied catalysts and their catalytic activities it can be concluded that MgO and Fe modified catalysts shows better activity for syngas production due to their basic and crystalline properties. And CeO2 modified catalysts or MgO catalysts with crystallite sizes lower than 5 nm are shows better performances for CO free product

Phd Degree / Doktora

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