A strategy was developed to obtain from acetylenedicarboxylic acid either an acetylenedicarboxylate-based Zr metal-organic framework (MOF) with fcu topology or a halo-functionalized-MOF-801 through in situ ligand hydrohalogenation. The new materials feature exceptionally high hydrophilicity and CO /H adsorption energetics. The acetylenedicarboxylate linker and its functionalizable triple-bond discloses its potential in the engineering of microporous materials with targeted properties.
Metal–organic
frameworks (MOFs) currently receive high interest
for cycling water adsorption applications like adsorption heat transformation
for air-conditioning purposes. For practical use in adsorption heat
pumps (AHPs), the microcrystalline powders must be formulated such
that their high porosity and pore accessibility are retained. In this
work, the preparation of millimeter-scaled pellets of MIL-160(Al),
Al-fumarate (Basolite A520), UiO-66(Zr), and Zr-fumarate (MOF-801)
is reported by applying the freeze granulation method. The use of
poly(vinyl alcohol) (PVA) as a binder reproducibly resulted in highly
stable, uniformly shaped PVA/MOF pellets with 80 wt % MOF loading,
with essentially unchanged MOF porosity properties after shaping.
The shaped pellets were analyzed for the application in AHPs by water
adsorption isotherms, over 1000 water adsorption/desorption cycles,
and thermal and mechanical stability tests. Furthermore, the Al-fum
pellets were applied in a fixed-bed, full-scale heat exchanger, yielding
specific cooling powers from 349 up to 431 W/kg (adsorbent), which
outperforms the current commercially used silica gel grains in AHPs
under comparable operating conditions.
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