MULTINUCLEAR SOLID-STATE NMR INVESTIGATION OF ZEOLITE MCM-22

被引:86
作者
HUNGER, M [1 ]
ERNST, S [1 ]
WEITKAMP, J [1 ]
机构
[1] UNIV STUTTGART, INST CHEM TECHNOL 1, D-70550 STUTTGART, GERMANY
来源
ZEOLITES | 1995年 / 15卷 / 03期
关键词
MCM-22; CRYSTALLOGRAPHICALLY NONEQUIVALENT T SITES; SOLID-STATE NMR; HIGH-FIELD AL-27 MAS NMR;
D O I
10.1016/0144-2449(94)00038-T
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 this paper, the results of the first high-field (B-0 = 17.6 T) Al-27 MAS n.m.r. measurement on zeolite MCM-22 are reported. The Si-29 and Al-27 MAS n.m.r, spectra of as-synthesized and dealuminated zeolite MCM-22 were interpreted by signals of framework silicon and aluminum atoms located on at least five crystallographically nonequivalent T sites. After ammonium exchange and calcination of zeolite MCM-22, acidic bridging OH groups identified by a H-1 MAS n.m.r. signal at 4.2 ppm are formed. Using Si-29 CP/MAS n.m.r, spectroscopy these bridging OH groups were attributed to hydroxyl protons bonded via oxygen bridges to Si(1 Al) atoms located on all the at least five crystallographically nonequivalent T sites.
引用
收藏
页码:188 / 192
页数:5
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