HIGH H2 UPTAKE ON Co(II)- AND Ni(II)- EXCHANGED ZSM-5 and US-Y HAVING OPTIMAL HEAT OF ADSORPTION VALUES

Abstract

Hydrogen adsorption capacity of Ni(II) and Co(II)- exchanged ZSM-5 and US-Y were investigated at 298 K and 10 bar. Mesopore added zeolites that have a total pore volume value reaching 0.5 cm3/g, showed a gravimetric H<inf>2</inf> storage capacity of 0.14wt.% and a volumetric storage capacity of 4.2 g/L at 298 K and 10 bar. The calculated isosteric heat of H<inf>2</inf> adsorption values ranged from 16 and 32 kJ/mol with the highest values observed on Ni(II)ZSM-5. Theoretical heat of H<inf>2</inf> adsorption values were also calculated using density functional theory utilizing both cluster and periodic models for Co(II)- or Ni(II)- exchanged ZSM-5. The theoretical heat of adsorption values were calculated between 11 and 38 kJ/mol, in consistence with the experimental values. © 2023 Elsevier B.V., All rights reserved.