Methane storage mechanism in the metal-organic framework Cu-3(btc)(2): An in situ neutron diffraction study

Juergen Getzschmann, Irena Senkovska, Dirk Wallacher, Michael Tovar, David Fairen-Jimenez, Tina Dueren, Jasper M. van Baten, Rajamani Krishna, Stefan Kaskel

Research output: Contribution to journalArticlepeer-review

Abstract

The adsorption of deutero-methane (CD4) in Cu-3(htc)(2) (HKUST-1) was investigated at 77K using high-resolution neutron powder diffraction. Rietveld refinement of the neutron data revealed a sequential filling of the rigid framework at distinct preferred adsorption sites, and showed the importance of open metal sites even for non-polar molecules such as methane. Four main adsorption sites were identified, located inside the small and two larger pores of the framework. The shorter distances between the CD4 center and the pore wall atoms are covering a range from 3.07 to 3.547 A. The maximum occupation of 170 CD4 molecules per unit cell, estimated from the refined occupancy of the adsorption sites, is close to the value estimated from volumetric adsorption isotherms at 77K (176 molecules per cell). Molecular simulation gave further insight into the adsorption mechanism. (C) 2010 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)50-58
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume136
Issue number1-3
DOIs
Publication statusPublished - Dec 2010

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