H-1 MAS NMR AND NIR STUDIES OF ALUMINUM-EXCHANGED ZSM-5 ZEOLITES

被引：14

作者：

STAUDTE, B ^{[1
]}

HUNGER, M ^{[1
]}

NIMZ, M ^{[1
]}

机构：

[1] CENT INST PHYS CHEM,W-1199 BERLIN,GERMANY

来源：

ZEOLITES | 1991年 / 11卷 / 08期

关键词：

NMR; NIR; AIZSM-5; HZSM-5;

D O I：

10.1016/S0144-2449(05)80065-X

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：

H-1 MAS n.m.r., Al-27 MAS n.m.r., and spectroscopy in the near-infrared (n.i.r.) have been performed to study the Plank mechanism in Al-exchanged zeolite ZSM-5. It is shown that the dissociation of water on exchanged aluminum cations in ZSM-5 occurs even at room temperature. The aluminum-exchange prevents partially dealumination of the framework. The bridging OH groups and the nonframework AIOH groups removed by activation at 673 K arise by an additional loading with water; thus, the Plank mechanism is reversible.

引用

页码：837 / 841

页数：5

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