Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü, Türkiye
Tezin Onay Tarihi: 2019
Tezin Dili: Türkçe
Öğrenci: İsmihan Altıparmak
Asıl Danışman (Eş Danışmanlı Tezler İçin): Bahar İpek Torun
Danışman: Deniz Üner
Özet:
The growing population of the world increases the energy demand exponentially; necessitating utilization of a clean and renewable energy source. In this manner, H2 is a prominent candidate to be the future fuel by having gravimetrically high energy density, provided that a new lightweight, safe and economical onboard hydrogen storage system is developed for H2 fueled fuel cell vehicles. In this thesis, Cu(I)-exchanged micro- and meso-porous zeolites (Cu(I)-[B]-ZSM-5, Cu(I)-[Al]-ZSM-5, mesoporous Cu(I)-[B]-ZSM-5, Cu(I)-SSZ-13, Cu(I)-SSZ-39 and Cu(I)-US-Y) are prepared and tested for H2 adsorption at ambient temperature and low pressures. For this, a new Cu(I)-exchange method in liquid media that results in homogeneous Cu(I)-exchange is developed in this study. Using this new exchange method, Cl-free Cu(I)-samples are obtained with Cu/Al ratios reaching up to 1. Cu(I)-exchanged samples are tested for H2 adsorption in a temperature range between 278 K and 323 K. Among the tested zeolites, the highest H2 adsorption capacity is observed on mesoporous Cu(I)-[B]-ZSM-5 (reaching 125 μmol H2 gzeolite-1, H2 Cu-1 value of 1 at 323 K and at a pressure lower than 1 bar) with initial differential heat of H2 adsorption value of 76 kJ mol-1. Cu(I)-SSZ-39 also shows high H2 uptake capacity (reaching 60 μmol H2 gzeolite-1, H2 Cu-1 value of 0.08 at 293 K and 1 bar) with an isosteric heat of adsorption value of 80 kJ mol-1. The adsorption capacities of Cu(I)-zeolites and their potential for higher pressure applications are discussed considering the H2 binding energies, pore sizes and pore volumes of the tested zeolites.