PFG NMR-STUDY OF DIFFUSION ANISOTROPY IN ORIENTED ZSM-5 TYPE ZEOLITE CRYSTALLITES

被引：73

作者：

HONG, U

KARGER, J

KRAMER, R

PFEIFER, H

SEIFFERT, G

MULLER, U

UNGER, KK

LUCK, HB

ITO, T

机构：

[1] KARL MARX UNIV, SEKT PHYS, O-7010 LEIPZIG, GERMANY

[2] UNIV MAINZ, INST ANORGAN CHEM & ANALYT CHEM, W-6500 MAINZ, GERMANY

[3] ZENT INST KERNFORSCH ROSSENDORF, O-8051 DRESDEN, GERMANY

[4] TAMAI SANGYO CO, OTARU 04702, JAPAN

来源：

ZEOLITES | 1991年 / 11卷 / 08期

关键词：

PULSED-FIELD GRADIENT (PFG) NMR; DIFFUSION ANISOTROPY; ZSM-5; METHANE; CRYSTAL ORIENTATION;

D O I：

10.1016/S0144-2449(05)80061-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

ZSM-5 zeolite crystallites are oriented by introducing them into a system of parallel capillaries. In this way, by applying pulsed-field gradient (PFG) n.m.r., a direct measurement of the orientation dependence of diffusion in ZSM-5 crystals has become possible. Using methane as a diffusant, the ratio D(xy)/D(z) between the diffusivities in the xy plane and in the z direction has been found to be of the order of 4.5. This value is in satisfactory agreement with the behavior expected from both MD calculations and a random walk model of molecular propagation in the two-channel network of ZSM-5-type zeolites.

引用

页码：816 / 821

页数：6

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