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Cuo-loaded organo-montmorillonite with improved affinity towards hydrogen-an insight in matrice-metal and non-contact hydrogen-metal interactions

Abstract

Copper-loaded organo-Montmorillonite showed improved affinity towards hydrogen under ambient conditions. Clay ion exchange with a propargyl-ended cation followed by thiol-yne coupling with thioglycerol resulted in porous structure with a 6 fold higher specific surface area, which dramatically decreased after copper incorporation. X-ray diffraction and photoelectron spectrometry, nuclear magnetic resonance (1H and 13C) and CO2-thermal programmed desorption revealed strong Sulfur:Cu0 and Oxygen:Cu0 interactions. This was explained in terms of structure compaction that ‘trap’’ Cu0 nanoparticles (CuNPs) and reduce their mobility. Transmission electron microscopy showed predominant 1.0-1.5 nm CuNPs. Hydrogen capture appears to involve predominantly physical interaction, since differential scanning calorimetry measurements gave low desorption heat and almost complete gas release between 20oC and 75oC. Possible hydrogen condensation within the compacted structure should hinder gas diffusion inside CuNPs and prevent chemisorption. These results allow envisaging safe hydrogen storage with easy gas release even at room temperature under vacuum. The reversible capture of hydrogen can be even more attractive when using natural inorganic supports and commercial plant-deriving dendrimers judiciously functionalized, even at the expense of porosity.

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Publication details

The article was received on 15 Jul 2017, accepted on 12 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP04784C
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Cuo-loaded organo-montmorillonite with improved affinity towards hydrogen-an insight in matrice-metal and non-contact hydrogen-metal interactions

    R. Sennour, T. C. Shiao, A. V. Arus, M. N. Nazir Tahir, N. Bouazizi, R. Roy and A. Azzouz, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP04784C

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