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

Altıparmak, İsmihan
Karakaya, Büşra
Üner, Deniz
İpek Torun, Bahar
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.

Citation Formats
İ. Altıparmak, B. Karakaya, D. Üner, and B. İpek Torun, “H-2 adsorption on Cu(I)-ZSM-5: Exploration of Cu(I)-exchange in solution,” INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol. 44, pp. 18866–18874, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/43011.