C-13 NMR INVESTIGATIONS ON THE ADSORPTION OF CARBON-MONOXIDE IN H-ZSM-5

被引：7

作者：

BRUNNER, E ^{[1
]}

PFEIFER, H ^{[1
]}

WUTSCHERK, T ^{[1
]}

ZSCHERPEL, D ^{[1
]}

机构：

[1] UOP GMBH, D-40699 ERKRATH, GERMANY

来源：

ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS | 1992年 / 178卷

关键词：

LEWIS ACID SITES; C-13 NMR SPECTROSCOPY; CARBON MONOXIDE;

D O I：

10.1524/zpch.1992.178.Part_2.173

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：

In a former paper [1] it has been shown that Lewis acidity of zeolites can be studied by C-13 NMR spectroscopy of adsorbed carbon monoxide. Although CO molecules adsorbed on Lewis acid sites exhibit an extremely large chemical shift relative to gaseous CO, the value of this shift could be determined only with a relatively large error, since the CO adsorbed on Lewis acid sites exchanges at room temperature with physisorbed CO and CO adsorbed on Bronsted acid sites. In the present paper the method of selective saturation has been used to determine the chemical shift of CO adsorbed on Lewis acid sites. For a deep-bed treated zeolite H-ZSM-5 a value of 590 +/- 60 ppm relative to gaseous CO has been found.

引用

页码：173 / 183

页数：11

共 14 条

[1] THE DEPENDENCE OF THE LINE SHIFTS IN NMR-SPECTRA OF ADSORBED MOLECULES ON SURFACE COVERAGE WITH COMPLEX-FORMATION - C-13-NMR STUDY OF THE INTERACTION OF ACETONE WITH OH GROUPS OF A SILICA-GEL [J].