Ammonia Storage by Reversible Host–Guest Site Exchange in a Robust Metal–Organic Framework

Abstract

MFM-300(Al) shows reversible uptake of NH₃ (15.7 mmol g^-1 at 273 K and 1.0 bar) over 50 cycles with an exceptional packing density of 0.62 g cm^-3 at 293 K. In situ neutron powder diffraction and synchrotron FTIR micro-spectroscopy on ND₃ @MFM-300(Al) confirms reversible H/D site exchange between the adsorbent and adsorbate, representing a new type of adsorption interaction.