Role of Silver Nanoparticles in Enhanced Xenon Adsorption Using Silver-Loaded Zeolites
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- 作者：Ludovic Deliere ; Sylvain Topin ; Benoit Coasne ; Jean-Pierre Fontaine ; Sophie De Vito ; Christophe Den Auwer ; Pier Lorenzo Solari ; C茅cile Daniel ; Yves Schuurman ; David Farrusseng
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：October 30, 2014
- 年：2014
- 卷：118
- 期：43
- 页码：25032-25040
- 全文大小：411K
- ISSN：1932-7455
文摘
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.