Laser-supported high-temperature MAS NMR for time-resolved in situ studies of reaction steps in heterogeneous catalysis

被引：34

作者：

Ernst, H ^{[1
]}

Freude, D ^{[1
]}

Mildner, T ^{[1
]}

Wolf, I ^{[1
]}

机构：

[1] UNIV LEIPZIG,ABT GRENZFLACHENPHYS,D-04103 LEIPZIG,GERMANY

来源：

SOLID STATE NUCLEAR MAGNETIC RESONANCE | 1996年 / 6卷 / 02期

关键词：

catalysis; C-13 magic-angle-spinning nuclear magnetic resonance; H-1 magic-angle-spinning nuclear magnetic resonance; in situ reactions; zeolite Y; ZSM-5;

D O I：

10.1016/0926-2040(95)01214-1

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 temperature of zeolite samples containing various adsorbed molecules was rapidly changed (within 15 s) from room temperature to 600 K by means of a laser beam. The location of the sealed glass ampoule in a boron nitride container decreases the temperature gradient in the sample and avoids laser-induced reactions. The technique facilitates time-dependent magic-angle-spinning (MAS) NMR spectroscopy of high-temperature reactions which take place within 60 s. The H-D exchange in the hydrogen form of zeolites loaded with fully deuterated molecules, the methanol-to-gasoline conversion and the catalytic ethylbenzene disproportionation in zeolites were monitored by C-13 and H-1 MAS NMR by means of a ''stop and go'' method.

引用

页码：147 / 156

页数：10