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Title: Thermodynamics of methane adsorption on copper HKUST-1 at low pressure

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [3];  [1]
  1. Univ. of California, Davis, CA (United States)
  2. Univ. of California, Davis, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. East China Univ. of Science and Technology, Shanghai (China)

Metal–organic frameworks (MOFs) can be engineered as natural gas storage materials by tuning the pore structures and surface properties. Here we report the direct measurement of CH₄ adsorption enthalpy on a paddlewheel MOF (Cu HKUST-1) using gas adsorption calorimetry at 25 °C at low pressures (below 1 bar). In this pressure region, the CH₄–CH₄ intermolecular interactions are minimized and the energetics solely reflects the CH₄–MOF interactions. Our results suggest moderately exothermic physisorption with an enthalpy of -21.1 ± 1.1 kJ/mol CH₄ independent of coverage. The calorimetric investigation complements previous computational and crystallographic studies by providing zero coverage enthalpies of CH₄ adsorption. The analysis of the new and literature data suggests that in initial stages of adsorption the CH₄–HKUST-1 interaction tends to be more sensitive to the pore dimension than to the guest polarizability, suggesting a less specific chemical binding role for the open Cu site.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
201308310077; 21201063; 20110074120020; FG02-05ER15667; AC52-06NA25396
OSTI ID:
1221609
Report Number(s):
LA-UR-15-24040
Journal Information:
Journal of Physical Chemistry Letters, Vol. 6, Issue 13; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (4)

Impact of H2O and CO2 on methane storage in metal–organic frameworks journal September 2019
Interplay of thermochemistry and Structural Chemistry, the journal (volume 29, 2018, issues 3–4) and the discipline journal June 2019
Modified Porous SiO2-Supported Cu3(BTC)2 Membrane with High Performance of Gas Separation journal July 2018
Surface energetics of carbon nanotubes–based nanocomposites fabricated by microwave-assisted approach journal August 2019

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