Cu(I)- içeren zeolitler üzerine hidrojen adsorpsiyonu.

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 gzeolite1, 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.M.S. - Master of Scienc

H-2 adsorption on Cu(I)-ZSM-5: Exploration of Cu(I)-exchange in solution

A new Cu(I)-exchange method for zeolites in liquid media (acetonitrile) was developed with Cu/Al ratios surpassing 0.5 with ZSM-5 crystals containing pure Cu(I) cations without impurities such as Cl ions. The method resulted in a higher Cu/Al ratio (0.78) for mesoporous [B]-ZSM-5 when compared to microporous [Al]-ZSM-5 and [B]-ZSM-5 (0.55 and 0.66 respectively). H-2 storage capacities of these Cu(I)-exchanged zeolites were investigated at 323 K along with their differential heat of H-2 adsorption using adsorption calorimetry. H-2 storage capacities as high as 0.03 wt. % at 323 K and 40 kPa were achieved on [Al] and [B]-ZSM-5 and mesoporous [B]-ZSM-5 showed an outstanding H-2/Cu ratio of 1.03 at 323 K and below 100 kPa. Coverage-dependent differential adsorption heats were found to be ranging from 95 kJ/mol to 5 kJ/mol with observed values of 30-10 kJ/mol for H-2/Cu ratios between 0.05 and 0.15. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved