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Insights into Adsorption of NH3 on HKUST-1 Metal–Organic Framework: A Multitechnique Approach

DOI: 10.1021/jp305756k DOI Help

Authors: Elisa Borfecchia (University of Turin, Italy) , Sara Maurelli (University of Turin, Italy) , Diego Gianolio (Diamond Light Source) , Elena Groppo (University of Turin, Italy) , Mario Chiesa (University of Turin, Italy) , Francesca Bonino (University of Turin, Italy) , Carlo Lamberti (University of Turin, Italy)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C , VOL 116 (37) , PAGES 19839 - 19850

State: Published (Approved)
Published: September 2012

Abstract: We report a careful characterization of the interaction of NH3 with the Cu(II) sites of the [Cu2C4O8] paddle-wheel cornerstone of the HKUST-1 metallorganic framework, also known as Cu3(BTC)2. The general picture emerging from combining XRPD, EXAFS, XANES, mid- and far-IR, DRUV–vis, and EPR techniques is that the presence of traces of water has relevant consequences on the effect of ammonia on the MOF framework. NH3 adsorption on the dry system results in a strong chemisorption on Cu(II) sites that distorts the framework, keeping the crystallinity of the material. Perturbation observed upon NH3 adsorption is analogous to that observed for H2O, but noticeably enhanced. When the adsorption of ammonia occurs in humid conditions, a time-dependent, much deeper modification of the system is observed by all of the considered techniques. On a methodological ground, it is worth noticing that we used the optimization of XANES spectra to validate the bond distance obtained by EXAFS.

Subject Areas: Chemistry

Facility: ESRF

Added On: 23/11/2012 12:37

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