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题名: Preferential occupation of xenon in zeolite MCM-22 as revealed by Xe-129 NMR spectroscopy
作者: Chen, F;  Deng, F;  Cheng, MJ;  Yue, Y;  Ye, CH;  Bao, XH
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2001-10-04
DOI: 10.1021/jp011710+
卷: 105, 期:39, 页:9426-9432
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Adsorption of xenon in zeolite MCM-22, a zeolite containing two separate pore systems (the 10-membered ring (MR) sinusoidal channels and 12-MR supercages interconnected by 10-MR window system), has been investigated in detail with Xe-129 NMR spectroscopy as a function of Xe loadings over a wide range of temperatures (120-350 K). NMR results suggest that Xe atoms are preferentially adsorbed in the supercages of the zeolite at low Xe pressure (less than a few atmospheres), while Xe atoms can penetrate into the two-dimensional sinusoidal channels at high Xe pressure. No direct exchange between the Xe in the supercages and the sinusoidal channels was observed in variable-temperature (VT) Xe-129 NMR experiments for all of the samples, which is in line with the crystal structure of the zeolite. However, when the Xe adsorption pressure is greater than 6 atm, two different kinds of Xe exchange were observed in VT experiments over the temperature range. The exchange of Xe at the different adsorption sites in the same supercage (i.e., Xe atoms in the two pockets and those in the central part of the supercage) occurs at lower temperatures (170-122 K), which is demonstrated by two-dimensional Xe-129 NMR exchange spectroscopy. The exchange between Xe in the supercage and the sinusoidal channel takes place through gaseous Xe in the interparticle space at higher temperatures (280-350 K).
关键词[WOS]: NUCLEAR-MAGNETIC-RESONANCE ;  MICROPOROUS SOLIDS ;  MOLECULAR-DYNAMICS ;  CHEMICAL-SHIFTS ;  NAY ZEOLITE ;  ADSORPTION ;  DEPENDENCE ;  DIFFUSION ;  BENZENE ;  ZSM-12
语种: 英语
WOS记录号: WOS:000171400800007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138911
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Nucl Magnet Resonance & Atom & Mol, Wuhan 430071, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Chen, F,Deng, F,Cheng, MJ,et al. Preferential occupation of xenon in zeolite MCM-22 as revealed by Xe-129 NMR spectroscopy[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2001,105(39):9426-9432.
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