Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Synthesis of Copper Based Metal Organic Framework for Separation of Co2/H2 at High Pressure(Izmir Institute of Technology, 2014) Çiçek, Ahmet Uğur; Özkan, Seher Fehime; Çakicioğlu Özkan, Seher Fehime; 03.02. Department of Chemical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyIn this study, synthesis of Copper based metal organic framework (CuTPA) was achieved. Terephthalic acids were used as an organic linkers supplied from PETKİM A.Ş. Synthesis procedure was carried out in three steps; crystallization, purification and activation with different parameters. Crystallization time and temperature, purification method and solvent type , thermal activation rate are studied. MOFs were characterized by using SEM (Scanning Electron Microscopy), Fourier Transformer Infrared (FTIR), Thermal Gravimetric Analyzer (TGA), X-ray Diffractometer (XRD), and Volumetric Adsorption Instrument (ASAP 2010). The CuTPA with the highest specific surface area (SLang=776 m2/g) was synthesized after purification with methanol by soxhlet method in a schott bottle for 24 hours at crystallization temperature of 110 oC. Copper based MOF synthesized (SLang=776 m2/g) and Commercial NaX zeolite (SLang= 1359 m2/g) were packed in the column. Dynamic adsorption behavior of adsorbents was also studied; breakthrough of CO2/H2 and gases from the packed bed were carried out under total molar flow rate of 10, 20, and 30 mL/min gas mixture at 1, 5, and, 10 bars. It was conclude that the adsorption data results obtained from our system is reliable. As a result of breakthrough experiment both adsorbents (CuTPA and 13X zeolite) did not adsorbed H2. The break points are increased with increasing pressure and decreasing total flow rate. The amount to be adsorbed by the adsorbent in the column is increased indicating that the adsorption mechanism, controlling mechanism is changed with decreasing total flow rate.Master Thesis Preparation of Natural Zeolite Supported Tio2 Composites for Removal of Terephthalic Acid(Izmir Institute of Technology, 2014) Deliismail, Özgün; Deliismail, Özgün; Özkan, Seher Fehime; Çakicioğlu Özkan, Seher Fehime; Helvacı, Şerife Şeref; 03.02. Department of Chemical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyThis study focuses on the preparation of natural zeolite supported TiO2 composites for the removal of model pollutant, terepththalic acid (TPA) via sorption. Natural zeolite was purified and used to prepare natural zeolite supported TiO2 adsorbents. Prior to sorption, the adsorbents were characterized by Scanning Electron Microscopy, Volumetric Adsorption Instrument, X-ray Diffractometer, Fourier Transformer Infrared, Induced Coupled Plasma Atomic Emmision Spectroscopy, and Thermal Gravimetric Analyzer. It was deduced that natural zeolite was clinoptilolite rich low (Ca) silicate. The sorption studies of TPA on adsorbents were applied in dark conditions at room temperature by altering adsorbent amount (0.2-1.5 g/l) and initial TPA concentration (20-60 ppm). It was observed that the amount of adsorbed TPA per unit mass of adsorbent decreased with increasing adsorbent amount, and sorption percent was unchanged (about 72%). This can be explained by the affinity of adsorbents to water molecules more than TPA molecules. Much more number of TPA molecules was allocated on the clinoptilolite than TiO2 composites. Sorption mechanism was identified by fitting the kinetic data to diffusion (Weber-Morris model, intraparticle/external diffusion) and reaction models (First order and pseudo second order model). First order reaction model was well correlated to experimental data for sorption process. Comparing pore size of the adsorbents to molecular size of TPA indicates that main contribution to intraparticle diffusion was the intercrystalline diffusion. Intraparticle diffusion was not the sole rate-limiting step due to the existence of external resistance. Biot and Weber-Morris calculations corroborated these results. In the future, photocatalytic performance of these adsorbents will also be tested.