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


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Altıparmak İ., Karakaya B., Üner D. , İpek Torun B.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.44, ss.18866-18874, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 44
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.ijhydene.2018.10.111
  • Dergi Adı: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Sayfa Sayıları: ss.18866-18874

Özet

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.