Adsorption Enthalpy Calculations of Hydrogen Adsorption at Ambient Temperature and Pressures Exceeding 300 bar - American Journal of Analytical Chemistry

AJAC > Vol.4 No.10, October 2013

American Journal of Analytical Chemistry

Volume 4, Issue 10 (October 2013)

ISSN Print: 2156-8251 ISSN Online: 2156-8278

Google-based Impact Factor: 1.49 Citations

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

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DOI: 10.4236/ajac.2013.410A3002 7,590 Downloads 10,512 Views Citations

Author(s)

Matthew Beckner, Anne Dailly

Affiliation(s)

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

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

Share and Cite:

Beckner, M. and Dailly, A. (2013) Adsorption Enthalpy Calculations of Hydrogen Adsorption at Ambient Temperature and Pressures Exceeding 300 bar. American Journal of Analytical Chemistry, 4, 8-16. doi: 10.4236/ajac.2013.410A3002.

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