29Si{27Al} TRAPDOR MAS NMR to distinguish Qn(mAl) sites in aluminosilicates. Test case: Faujasite-type zeolites

被引：20
作者：
Greiser, S. [1 ]
Hunger, M. [2 ]
Jaeger, C. [1 ]
机构：
[1] Bundesanstalt Mat Forsch & Prufung BAM, Div Struct Anal 13, Richard Willstatter Str 11, D-12489 Berlin, Germany
[2] Univ Stuttgart, Inst Chem Technol, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
来源：
SOLID STATE NUCLEAR MAGNETIC RESONANCE | 2016年 / 79卷
关键词：
Solid-state NMR; Si-29{Al-27} TRAPDOR MAS NMR; Q(4)(mAl) sites; Faujasite-type zeolites; Aluminosilicates; ECHO DOUBLE-RESONANCE; ALKALINE ACTIVATION; H-1; MAS; SI-29; SPECTROSCOPY; GLASSES; SILICA; AL-27; ALUMINOPHOSPHATES; GEOPOLYMERS;
D O I：
10.1016/j.ssnmr.2016.10.004
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：
Si-29{Al-27} TRAPDOR MAS NMR was applied to two faujasite-type zeolites with Si/Al ratios of 1.3 (Na-X) and 2.7 (Na-Y). The aim of this test study is to show that different Q(4)(mAl) sites (m = 4, 3, 2, 1) can be distinguished by differently strong TRAPDOR effects (Delta S/S-0). Indeed, it was found that the TRAPDOR effect depends on the number m of AlO4 units connected to the Q(4) silicon tetrahedrons. For Na-X, the measured Delta S/S-0 values are 1 : 0.81 : 0.56 for Q(4)(4Al), Q(4)(3Al) and Q(4)(2Al), respectively (normalized to Q(4)(4Al)). The corresponding Delta S/S-0 values are the same for Na-Y within the error bars, although the silicon sites are different: Q(4)(3Al), Q(4)(2Al) and Q(4)(1Al) and now normalized to Q(4)(3Al) as no Q(4)(4Al) is present. Nevertheless, the proposed method opens up the possibility to distinguish overlapping Si-29 NMR signals of the Q(n)(mAl) sites in amorphous materials as the main goal of these investigations.
引用
收藏
页码：6 / 10
页数：5
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