COMPARISON OF XE-129 NMR AND H-1 PULSED FIELD GRADIENT NMR MEASUREMENTS FOR THE LOCATION OF THE DEPOSIT OF CARBONACEOUS COMPOUNDS ON ZEOLITE-A

被引：4

作者：

ITO, T ^{[1
]}

FRAISSARD, J ^{[1
]}

KARGER, J ^{[1
]}

PFEIFER, H ^{[1
]}

机构：

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

来源：

ZEOLITES | 1991年 / 11卷 / 02期

关键词：

ZEOLITES; COKING; XE-129; NMR; PULSE-FIELD GRADIENT NMR;

D O I：

10.1016/0144-2449(91)80402-L

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：

The fundamentals of Xe-129 n.m.r. spectroscopy and of H-1 n.m.r. diffusion measurements to localize deposits of carbonaceous compounds on zeolites are presented. In particular, it is demonstrated that both n.m.r. methods make it possible to distinguish unambiguously between the location of these deposits in the intercrystalline pore system and on the external surface of the crystallites. In the first experiments with A zeolites, it is shown by both techniques as well as by complementary adsorption measurements that the carbonaceous compounds are deposited mainly as a layer on the external surface of the crystallites.

引用

页码：103 / 106

页数：4

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