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Preferential occupation of xenon in zeolite MCM-22 as revealed by Xe-129 NMR spectroscopy
Chen, F; Deng, F; Cheng, MJ; Yue, Y; Ye, CH; Bao, XH
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
2001-10-04
DOI10.1021/jp011710+
Volume105Issue:39Pages:9426-9432
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordNUCLEAR-MAGNETIC-RESONANCE ; MICROPOROUS SOLIDS ; MOLECULAR-DYNAMICS ; CHEMICAL-SHIFTS ; NAY ZEOLITE ; ADSORPTION ; DEPENDENCE ; DIFFUSION ; BENZENE ; ZSM-12
AbstractAdsorption 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).
Language英语
WOS IDWOS:000171400800007
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/138911
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Chen, F,Deng, F,Cheng, MJ,Yue, Y,Ye, CH,&Bao, XH.(2001).Preferential occupation of xenon in zeolite MCM-22 as revealed by Xe-129 NMR spectroscopy.JOURNAL OF PHYSICAL CHEMISTRY B,105(39),9426-9432.
MLA Chen, F,et al."Preferential occupation of xenon in zeolite MCM-22 as revealed by Xe-129 NMR spectroscopy".JOURNAL OF PHYSICAL CHEMISTRY B 105.39(2001):9426-9432.
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