|Role of Silver Nanoparticles in Enhanced Xenon Adsorption Using Silver-Loaded Zeolites
|Year of Publication
|Deliere L, Topin S, Coasne BA, Fontaine J-P, De Vito S, Auwer CDen, Solari PLorenzo, Daniel C, Schuurman Y, Farrusseng D
|Journal of Physical Chemistry C
|Type of Article
Molecular simulation is used to unravel the adsorption mechanisms of xenon on Ag-doped ZSM-5 zeolite. We show that silver nanoparticles, which form at the external surface of zeolite crystallites, are responsible for enhanced xenon physisorption at very low pressure. We also propose a simple model of adsorption on such composite materials made up of silver-exchanged zeolites and silver nanoparticles adsorbed at the zeolite surface. This model, which allows predicting the adsorption of other gases without any additional parameters, provides a tool to characterize the amount of reduced silver as well as the silver particle size distribution (in good agreement with transmission electron microscopy images). The presence of a majority of silver nanoparticles is further characterized by means of X-ray diffraction and X-ray Absorption Spectroscopy at the silver K edge.