通过X射线衍射（XRD）、扫描电子显微镜（SEM）以及固态109Ag、29Si和27Al核磁共振光谱法对银交换的ETS-10和丝光沸石上的银物种进行的研究。

A study of silver species on silver-exchanged ETS-10 and mordenite by XRD, SEM and solid-state 109Ag, 29Si and 27AI NMR spectroscopy.

作者信息

Liu Yan, Chen Fu, Wasylishen Roderick E, Xu Zhenghe, Sawada James, Kuznicki Steven M

机构信息

Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada.

出版信息

J Nanosci Nanotechnol. 2012 Aug;12(8):6420-7. doi: 10.1166/jnn.2012.6437.

DOI:10.1166/jnn.2012.6437

PMID:22962758

Abstract

Silver zeolites, especially Ag-ETS-10 and Ag-mordenite, actively bind xenon and iodine, two prime contaminants common to nuclear accidents. The evolution of silver species on silver exchanged ETS-10 (Ag/ETS-10) and mordenite (Ag/Mor) has been investigated by exposing the materials to a series of activation conditions in Ar, air and H2. The samples were characterized by XRD, SEM and solid-state 109Ag, 29Si and 27AI MAS NMR. The silver reduction and structural evolution have been illustrated by those techniques. The effectiveness of one sample of each type of sieve was tested for its ability to trap mercury from a gas stream. However, the results from this study demonstrate that the adsorption characteristics of silver-loaded sieves cannot necessarily be predicted using a full complement of structural characterization techniques, which highlights the importance of understanding the formation and nature of silver species on molecular sieves.

摘要

银沸石，特别是Ag-ETS-10和银丝光沸石，能有效吸附氙和碘，这是核事故中常见的两种主要污染物。通过将银交换的ETS-10（Ag/ETS-10）和丝光沸石（Ag/Mor）置于氩气、空气和氢气中的一系列活化条件下，研究了银物种的演变。采用X射线衍射（XRD）、扫描电子显微镜（SEM）以及固态109Ag、29Si和27Al魔角旋转核磁共振（MAS NMR）对样品进行了表征。这些技术阐明了银的还原和结构演变。测试了每种类型筛子的一个样品从气流中捕集汞的能力。然而，本研究结果表明，使用全套结构表征技术不一定能预测载银筛子的吸附特性，这突出了了解分子筛上银物种的形成和性质的重要性。