XE-129 AND AL-27 NMR-STUDY OF HIGH-SILICA ZEOLITES SYNTHESIZED IN NONALKALINE FLUORIDE MEDIA - GA, AL-MFI AND AL-BETA

被引：12

作者：

CHEN, QJ ^{[1
]}

GUTH, JL ^{[1
]}

SEIVE, A ^{[1
]}

CAULLET, P ^{[1
]}

FRAISSARD, J ^{[1
]}

机构：

[1] ECOLE NATL SUPER CHIM MULHOUSE, CNRS, URA 428, MAT MINERAUX LAB, F-68093 MULHOUSE, FRANCE

来源：

ZEOLITES | 1991年 / 11卷 / 08期

关键词：

XE-129; NMR; FLUORIDE MEDIUM SYNTHESIS; ZEOLITES; GA-MFI AND AL-MFI; ZEOLITE BETA; EXTRAFRAMEWORK ALUMINUM;

D O I：

10.1016/S0144-2449(05)80058-2

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：

Zeolites synthesized in nonalkaline fluoride media are characterised by Xe-129 and Al-27 n.m.r. spectroscopy. In gallium MFI, the element is present in the framework. As in the case of aluminum, the xenon chemical shift at zero concentration depends only on the Si/Ga ratio. For samples with less than 4 Ga/u.c. overall, the distribution is heterogeneous (the crystallite core is Ga-rich). The presence of highly positively charged nonframework AI(NF) interacting strongly with the xenon is demonstrated in a Beta zeolite. This has also been observed in MFI-type zeolites. In this latter case, the charge on the AI(NF) decreases with the AI(NF) concentration as a result of the formation of probably more polymerized species.

引用

页码：798 / 803

页数：6

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