H-1 SOLID-STATE NMR-STUDIES OF THE GEOMETRY OF BRONSTED ACID SITES IN ZEOLITES H-ZSM-5

被引：42

作者：

HUNGER, M

FREUDE, D

FENZKE, D

PFEIFER, H

机构：

[1] Fachbereich Physik der Universität Leipzig, O- 7010 Leipzig

来源：

CHEMICAL PHYSICS LETTERS | 1992年 / 191卷 / 05期

关键词：

D O I：

10.1016/0009-2614(92)85397-S

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：

Broad-line H-1 NMR and H-1 MAS NMR were used to determine the geometry of the Bronsted acidic sites in zeolites H-ZSM-5. The signals obtained correspond to bridging hydroxyl groups in Si-OH-Al arrangements with an H-Al distance of 0.246-0.252 nm. The concentration of hypothetical SiOHSi groups must be less than 0.26 species per unit cell.

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页码：391 / 395

页数：5

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