title: Metal-inorganic-organic matrices as efficient sorbents for hydrogen storage.
abstract: Stabilization of metal nanoparticles (MNPs) without re-aggregation is a major challenge. An unprecedented strategy is developed for achieving high dispersion of copper(0) or palladium(0) on montmorillonite-supported diethanolamine or thioglycerol. This results in novel metal-inorganic-organic matrices (MIOM) that readily capture hydrogen at ambient conditions, with easy release under air stream. Hydrogen retention appears to involve mainly physical interactions, slightly stronger on thioglycerol-based MIOM (S-MIOM). Thermal enhancement of desorption suggests also a contribution of chemical interactions. The increase of hydrogen uptake with prolonged contact times arises from diffusion hindrance, which appears to be beneficial by favoring hydrogen entrapment. Even with compact structures, MIOMs act as efficient sorbents with much higher efficiency factor (1.14-1.17 mmol H 2 m(-2)) than many other sophisticated adsorbents reported in the literature. This opens new prospects for hydrogen storage and potential applications in microfluidic hydrogenation reactions.
authors: Department of Chemistry, University of Quebec at Montreal (UQAM), CP 8888, Succ. Centre-ville, Montreal, Quebec H3C3P8 (Canada), Fax:1-514-987-4054 www.nanoqam.uqam.ca/professeur.php?id=11&lang=fr. azzouz.a@uqam.ca.
authors: Abdelkrim
authors: A
authors: Azzouz
authors: Saadia
authors: S
authors: Nousir
authors: Nabil
authors: N
authors: Bouazizi
authors: René
authors: R
authors: Roy
mesh_terms: D001546:Bentonite / Q000737:chemistry*; D003300:Copper / Q000737:chemistry; D004983:Ethanolamines / Q000737:chemistry*; D005990:Glycerol / Q000031:analogs & derivatives* / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry; D012821:Silanes / Q000737:chemistry*
chemical_list: D004983:Ethanolamines; D012821:Silanes; D001546:Bentonite; D010165:Palladium; D003300:Copper; D006859:Hydrogen; C009465:thioglycerol; C020283:diethanolamine; D005990:Glycerol
keywords: hydrogen storage; metal nanoparticles; metal-inorganic-organic matrices; montmorillonite; palladium