Ball milling and compression effects on hydrogen adsorption by MOF:Pt/carbon mixtures

• HKUST-1 mixed with Pt/AC was ball milled at different energies.
• Surface area decreases with the increasing milling energy.
• The metal coordination environment is affected as reveled by infrared spectra.
• The lattice structure remains basically not changed.
• No significant hydrogen adsorption enhancement was observed.

The effect of ball milling energy on hydrogen adsorption on metal–organic framework:Pt/AC mixtures (HKUST-1:Pt/AC, AC – activated carbon) is reported. Experiments within a wide range of ball milling energies show a decrease of hydrogen adsorption with the increasing energy transferred to the sample. The results correlate well with the decrease of surface area and pore volume. The infrared spectra reveal that the mechanical energy transferred to the sample induces modifications in the metal coordination environment, the most compliant to compression part in the structure of the metal–organic frameworks. A comparison with the results on compressed pellets of the mixture reveals that both the ball milling and compression lead to similar effects, originating in mechanical energy transferred to the sample.

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