[en] Crystalline materials with pore dimensions comparable to the kinetic diameters of the guest molecules are attractive for their potential use in adsorption and separation applications. The nanoporous γ-Mg(BH4)2 features one-dimensional channels matching this criterion for Kr uptake, which has been probed using synchrotron powder diffraction at various pressures and temperatures. It results in two coexisting crystalline phases with the limiting composition Mg(BH4)2·0.66Kr expecting the highest Kr content (50.7 wt % in the crystalline phase) reported for porous materials. Quasi-equilibrium isobars built from Rietveld refinements of Kr site occupancies were rationalized with a noncooperative lattice gas model, yielding the values of the thermodynamic parameters. The latter were independently confirmed from Kr fluorescence. We have also parameterized the pronounced kinetic hysteresis with a modified mean-field model adopted for the Arrhenius kinetics.
Disciplines :
Chemistry
Author, co-author :
Dovgaliuk, Iurii ; Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility , 71 avenue des Martyrs , Grenoble 38000 , France ; Institut des Matériaux Poreux de Paris, UMR 8004 CNRS, Ecole Normale Supérieure, Ecole Supérieure de Physique et de Chimie Industrielles de Paris , PSL Université , Paris 75005 , France
Dyadkin, Vadim; Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility , 71 avenue des Martyrs , Grenoble 38000 , France
Filinchuk, Yaroslav ; Institute of Condensed Matter and Nanosciences , Université Catholique de Louvain , Place L. Pasteur 1 , B-1348 Louvain-la-Neuve , Belgium
Chernyshov, Dmitry; Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility , 71 avenue des Martyrs , Grenoble 38000 , France
Language :
English
Title :
Non-Isothermal Kinetics of Kr Adsorption by Nanoporous γ-Mg(BH4)2 from in Situ Synchrotron Powder Diffraction.
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