期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 37, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202207316
关键词
Alumina; Catalysis; Density Functional Calculations; Solid-State NMR; Surface Chemistry
资金
- Chevreul Institute [FR 2638]
- Ministere de l'Enseignement Superieur, de la Recherche et de l'Innovation
- Hauts-deFrance Region
- FEDER
- IR-RMN-THC FR 3050 CNRS
- CINECA award under the ISCRA initiative [HP10C0T7WT 2022]
- ChimieParisTech-PSL
- CPE-Lyon
- CNRS
- Embassy of France in the United States
- U.S. Department of Energy, Office of Science, Division of Basic Energy Sciences, under the Catalysis Science Initiative [DE-FG-02-03ER15467]
This study provides a qualitative and quantitative assessment of the hydroxyl groups on the surface of γ-Al2O3 and describes the principal configurations of hydroxyl groups in unprecedented detail. The relationship between hydroxyl structures and the molecular-level structures of active sites in catalytic alkane metathesis is discussed.
Aluminas are strategic materials used in many major industrial processes, either as catalyst supports or as catalysts in their own right. The transition alumina gamma-Al2O3 is a privileged support, whose reactivity can be tuned by thermal activation. This study provides a qualitative and quantitative assessment of the hydroxyl groups present on the surface of gamma-Al2O3 at three different dehydroxylation temperatures. The principal [AlOH] configurations are identified and described in unprecedented detail at the molecular level. The structures were established by combining information from high-field H-1 and Al-27 solid-state NMR, IR spectroscopy and DFT calculations, as well as selective reactivity studies. Finally, the relationship between the hydroxyl structures and the molecular-level structures of the active sites in catalytic alkane metathesis is discussed.
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