AL-27 AND SI-29 N.M.R. STUDIES OF HZSM-5 .2. THE EFFECT OF COKE FORMATION

被引：27

作者：

MEINHOLD, RH

BIBBY, DM

机构：

[1] Chemistry Division, Department of Scientific and Industrial Research, Petone

来源：

ZEOLITES | 1990年 / 10卷 / 03期

关键词：

!sup]27[!/sup]Al; !sup]29[!/sup]Si; coking; HZSM-5; n.m.r; Zeolite;

D O I：

10.1016/0144-2449(90)90037-R

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 formation of coke in zeolite channels during the conversion of methanol to gasoline in HZSM-5 causes changes in the 27Al and 29Si spectra of the zeolite. Displacement of water and oxygen by bulky molecules in the channels increases the electric-field gradient at 27Al, decreases the 29Si relaxation rate, and eventually distorts the channel walls. Cross-polarization 29Si n.m.r. was used to follow the hydrogen content of the coke, whereas water and oxygen contents were related to the amount of coke in the channels and the proportion of methyl groups. © 1990.

引用

页码：146 / 150

页数：5