This work reports hydrogen adsorption
properties of four different
metal–organic frameworks (MOFs) namely Zn-BDC, Cr-BDC, Ni-DABCO,
and Mg-DOBDC. Gravimetric hydrogen adsorption measurements are performed
over a wide range of temperature (90 K to 298 K) and pressure (0 bar
to 100 bar). At the lowest experimental temperature (90 K to 100 K)
all the isotherms are saturated and the adsorption capacity is governed
by pore volume. On the other hand, at room temperature the isotherms
closely follow Henry’s law. Modeling of the excess isotherms
is also done. Net adsorption isotherms, which can directly indicate
the efficiency of porous adsorbent for storage, are also presented.
In terms of volumetric efficiency, Mg-DOBDC MOF exhibits best storage
capacity out of all the MOFs considered in this study.
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