Impact of Mineralizing Agents on Aluminum Distribution and Acidity of ZSM-5 Zeolites

被引：28

作者：

Al-Nahari, Shadi ^{[1
]}

Dib, Eddy ^{[3
]}

Cammarano, Claudia ^{[1
]}

Saint-Germes, Etienne ^{[1
]}

Massiot, Dominique ^{[2
]}

Sarou-Kanian, Vincent ^{[2
]}

Alonso, Bruno ^{[1
]}

机构：

[1] Univ Montpellier, ICGM, CNRS, ENSCM, F-34293 Montpellier 5, France

[2] Univ Orleans, CNRS, CEMHTI UPR3079, F-45071 Orleans 2, France

[3] Normandie Univ, LCS, ENSICAEN, UNICAEN,CNRS, F-14000 Caen, France

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2023年 / 62卷 / 07期

关键词：

Acidity; Electrostatic Interactions; NMR Spectroscopy; Temperature Programmed Desorption; Zeolites; SOLID-STATE NMR; RESOLUTION AL-27 NMR; AL DISTRIBUTION; MFI FRAMEWORK; LOCATION; ATOMS; FLUORIDE; SILICON; MAS; DISORDER;

D O I：

10.1002/anie.202217992

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Intensive research on improving the catalytic properties of zeolites is focused on modulating their acidity and the distribution of associated Al sites. Herein, by studying a series of ZSM-5 zeolites over a broad range of Al content, we demonstrate how the nature of the mineralizing agent (F- or OH-) used in hydrothermal syntheses directly impacts Al sites distribution. The proportions of Al sites, probed by Al-27 NMR, depend on the Si/Al ratio for F-, but remain identical for OH- (from Si/Al=30 to 760). This leads to contrasting variations in weak and strong acidities. Such opposite effect of mineralizers is explained by the spatial location of negative charges and the resulting balance between short- and long-range electrostatic interactions. This understanding paves the way for additional and simple opportunities to control zeolites' acidity.

引用

页数：5

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