Adsorption of Xe in zeolite MCM-22 |
| |
Authors: | Chen Fang Deng Feng Cheng Mojie Yue Yong Ye Chaohui |
| |
Institution: | (1)State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 ,China;
(2)State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 ,China |
| |
Abstract: | Adsorption of xenon in zeolite MCM-22, a zeo lite containing two separate pore systems, has been investigated in detail by variable temperature (VT) 129Xe NMR spectroscopy. NMR results suggest that Xe atoms are preferentially adsorbed in the supercages of the zeolite at low Xe pressure (less than a few atmosphere), while Xe atoms can penetrate into the two-dimensional sinusoidal channels at high Xe pressure. Exchange of xenon at the different adsorption sites in the same supercage, i.e. xenon atoms in the two pockets and those in the central part of the supercage, was confirmed at 145 K by two-dimensional (2D) 129Xe NMR exchange spectroscopy. The time scale for the exchange is about several milliseconds. |
| |
Keywords: | MCM-22 zeolite adsorption 129Xe NMR |
本文献已被 万方数据 SpringerLink 等数据库收录! |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |