A 9-Connected Zirconium-Based Metal-Organic Framework for Ammonia Capture
2019
Construction of
multifunctional metal-organic frameworks (MOFs) with asymmetric connectivity have
the potential to expand the scope of their utilization. Herein, we report a
robust 9-connected microporous Zr-based MOF, NU-300, assembled from asymmetric tri-carboxylate ligands and Zr6
nodes. As indicated by single-crystal X-ray diffraction analysis, there exist
uncoordinated carboxylate groups in the structure of NU-300 that can participate in ammonia (NH3) sorption
through acid-base interactions which yield high uptake of NH3 at low
pressure regions (<0.01 bar). In situ infrared
(IR) spectroscopy shows the interactions between Bronsted acidic sites and NH3,
which suggests that NU-300 can be
used as a sorbent for NH3 capture at low pressures.
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