High capacity ammonia adsorption in a robust metal-organic framework mediated by reversible host-guest interactions

Lixia Guo; Xue Han; Yujie Ma; Jiangnan Li; Wanpeng Lu; Weiyao Li; Daniel Lee; Ivan da Silva; Yongqiang Cheng; Svemir Rudić; Pascal Manuel; Mark D Frogley; Anibal J Ramirez-Cuesta; Martin Schröder; Sihai Yang

doi:10.1039/d2cc01197b

High capacity ammonia adsorption in a robust metal-organic framework mediated by reversible host-guest interactions

Chem Commun (Camb). 2022 May 10;58(38):5753-5756. doi: 10.1039/d2cc01197b.

Authors

Affiliations

¹ Department of Chemistry, University of Manchester, Manchester, M13 9PL, UK. M.Schroder@manchester.ac.uk.
² Department of Chemical Engineering and Analytical Science, University of Manchester, Manchester, M13 9PL, UK.
³ ISIS Facility, STFC Rutherford Appleton Laboratory, Oxfordshire, OX11 0QX, UK.
⁴ Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
⁵ Diamond Light Source, Harwell Science and Innovation Campus, Oxfordshire, OX11 0DE, UK.

Abstract

To understand the exceptional adsorption of ammonia (NH₃) in MFM-300(Sc) (19.5 mmol g^-1 at 273 K and 1 bar without hysteresis), we report a systematic investigation of the mechanism of adsorption by a combination of in situ neutron powder diffraction, inelastic neutron scattering, synchrotron infrared microspectroscopy, and solid-state ⁴⁵Sc NMR spectroscopy. These complementary techniques reveal the formation of reversible host-guest supramolecular interactions, which explains directly the observed excellent reversibility of this material over 90 adsorption-desorption cycles.