Adsorption Enthalpy Calculations of Hydrogen Adsorption at Ambient Temperature and Pressures Exceeding 300 bar

Matthew Beckner, Anne Dailly

Chemical and Materials Systems Laboratory, General Motors Global Research and Development Center, Warren, USA.
Optimal CAE Inc., Plymouth, USA.

DOI: 10.4236/ajac.2013.410A3002                

Abstract

Hydrogen adsorption isotherms were measured at ambient temperature to pressures exceeding 300 bar for three benchmark adsorbents: two metal-organic frameworks, Cu₃(btc)₂ (btc = 1,3,5-benzenetricarboxylate) and Zn₄O(btb)₂ (btb = 1,3,5-benzenetribenzoate), and the activated carbon MSC-30. The Dubinin-Astakhov model was applied to calculated absolute adsorption isotherms as a function of the fugacity to determine the adsorption enthalpy at ambient temperature. Comparisons of the calculated enthalpies and the surface excess concentration (excess adsorption per square meter of surface) show that Zn₄O(btb)₂ has an adsorption enthalpy comparable to MSC-30, but that the spacing between adsorbed molecules is much larger.

Keywords

Ambient Temperature Hydrogen Storage; Metal-Organic Frameworks; Activated Carbon; Adsorption Enthalpy

Conflicts of Interest

The authors declare no conflicts of interest.

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