Date

2019

Author

Altıparmak, İsmihan

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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.

Subject Keywords

Hydrogen as fuel., Hydrogen, Mesoporous materials., Renewable energy sources.

URI

http://etd.lib.metu.edu.tr/upload/12623023/index.pdf
https://hdl.handle.net/11511/27981

Collections

Graduate School of Natural and Applied Sciences, Thesis