Hydrogen adsorption on ZIF-8 zeolite structures: Structural and energetical analysis by molecular simulation
DOI:
https://doi.org/10.65093/aci.v16.n4.2025.42Keywords:
hydrogen, metal organic structure, ZIF-8, Grand Canonical Monte CarloAbstract
This study compares the hydrogen adsorption capacity of ZIF-8 at 77 K and 298 K and pressures from 0.5 to 80 atmospheres, using Molecular Dynamics (MD) and Grand Canonical Monte Carlo (GCMC) simulations. Analyses include adsorption isotherms, radial distribution functions, density maps, and adsorption energies. Adsorption at 77 K is greater than at 298 K, reaching 16 mmol/g and 0.5 mmol/g, respectively, consistent with the literature. Hydrogen adsorption sites are unaffected by changes in temperature and pressure; the preferential site is carbon C2 of the 2-methylimidazolate ligand, followed by carbon C3 of the ligand's methyl group, and at a greater distance, the zinc ion. Density and energy maps indicate that hydrogen is adsorbed onto all pores of ZIF-8 and that the energy is approximately -459 kcal/mol.
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