Ion and water mobility in hydrated Li-LSX zeolite studied by 1H, 6Li and 7Li NMR spectroscopy and diffusometry

被引：21

作者：

Freude, D. ^{[1
]}

Beckert, S. ^{[1
]}

Stallmach, F. ^{[1
]}

Kurzhals, R. ^{[2
]}

Taeschner, D. ^{[2
]}

Toufar, H. ^{[3
]}

Kaerger, J. ^{[1
]}

Haase, J. ^{[1
]}

机构：

[1] Univ Leipzig, Fak Phys & Geowissensch, D-04103 Leipzig, Germany

[2] Clariant Prod GmbH, Werk Bitterfeld, D-06803 Bitterfeld, Germany

[3] Sud Chem INC, Louisville, KY 40232 USA

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2013年 / 172卷

关键词：

Zeolite Li-LSX; MAS PFG NMR; Exchange spectroscopy; Self-diffusion; Ion mobility; SELF-DIFFUSION; STIMULATED ECHO; FIELD GRADIENTS; CHEMICAL-SHIFTS; H-1-NMR; LITHIUM; NAX;

D O I：

10.1016/j.micromeso.2013.01.011

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Crystallites of zeolite LSX with a diameter of about 10 mu m were synthesized. Crystals of this size are shown to allow the simultaneous investigation of intracrystalline mass transfer phenomena of water molecules and lithium ions in hydrated zeolite Li-LSX by NMR diffusometry. By MAS NMR spectroscopy with the H-1 and Li-6 nuclei, the water molecules and lithium ions are found to yield two signals, a major and a minor one, which may be attributed to locations in the sodalite cages and the supercages, respectively. By H-1 and Li-6 exchange spectroscopy the mean residence times in the sodalite cages at 373 K are found to be about 150 ms for the water molecules and about 40 ms for the lithium cations. PFG NMR self-diffusion measurements at 373 K yield a diffusivity of about 2 x 10(-11) m(2) s(-1) for the lithium ions, which is about one order of magnitude below the water diffusivity. (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：174 / 181

页数：8

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