Carlos Otero AREAN, Barbara BONELLI

87101

Hydrogen storage via physisorption: the combined role of adsorption enthalpy and entropy

Materials capable of cost-effective on-board hydrogen storage and delivery are currently being sought worldwide as a means to facilitate a hydrogen-based energy transition in the transportation sector. Among the solutions proposed, hydrogen storage by physisorption on porous solids constitutes a main avenue of research, and for intelligent design of such materials a detailed knowledge of gas adsorption thermodynamics is of the utmost importance. Analysis of the available data for hydrogen adsorption on alkali and alkaline-earth cation exchanged zeolites clearly shows that standard adsorption enthalpy (D H0) and entropy (D S0) are correlated, in the sense that larger D S0 values correspond to larger D H0 values. It was also shown that, referring to absolute values, the relative rate at which adsorption entropy changes decreases gradually as adsorption enthalpy increases thus resulting in a non-linear correlation between D H0 and D S0. These results are discussed and corresponding implications for hydrogen storage via physisorption are highlighted.
Anahtar Kelimeler:

Adsorption thermodynamics; enthalpy-entropy correlation; hydrogen physisorption; hydrogen storage.

Hydrogen storage via physisorption: the combined role of adsorption enthalpy and entropy

Materials capable of cost-effective on-board hydrogen storage and delivery are currently being sought worldwide as a means to facilitate a hydrogen-based energy transition in the transportation sector. Among the solutions proposed, hydrogen storage by physisorption on porous solids constitutes a main avenue of research, and for intelligent design of such materials a detailed knowledge of gas adsorption thermodynamics is of the utmost importance. Analysis of the available data for hydrogen adsorption on alkali and alkaline-earth cation exchanged zeolites clearly shows that standard adsorption enthalpy (D H0) and entropy (D S0) are correlated, in the sense that larger D S0 values correspond to larger D H0 values. It was also shown that, referring to absolute values, the relative rate at which adsorption entropy changes decreases gradually as adsorption enthalpy increases thus resulting in a non-linear correlation between D H0 and D S0. These results are discussed and corresponding implications for hydrogen storage via physisorption are highlighted.
Keywords:

Adsorption thermodynamics; enthalpy-entropy correlation; hydrogen physisorption; hydrogen storage.,

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Turkish Journal of Chemistry-Cover
  • ISSN: 1300-0527
  • Yayın Aralığı: 6
  • Yayıncı: TÜBİTAK
Arşiv
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Hydrogen storage via physisorption: the combined role of adsorption enthalpy and entropy

Carlos Otero AREAN, Barbara BONELLI