ArticleChemical science2021
On the location of Lewis acidic aluminum in zeolite mordenite and the role of framework-associated aluminum in mediating the switch between Brønsted and Lewis acidity.
Article in Chemical science, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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11 citing papers in PubMed, 124 citations in OpenAlex.
- Zeolite Catalysts Prepared with Maximum Brønsted Acidity Reveal a Dominant Contribution from Inaccessible Sites.Journal of the American Chemical Society · 2026Article
- Tandem Maneuvering of Acidic Sites and Porosity of Zeolite Beta Catalyst for Enhanced C-C Benzylation of Lignin Model 4-Ethylphenol.ChemSusChem · 2026Article
- Effect of Mesoporosity on Structural, Textural, and Optical Characteristics of Fe(III) Ion-Exchanged ZSM-5 Zeolites.Molecules (Basel, Switzerland) · 2025Article
- CO Adsorbates Induced Framework-Associated Low-Valence CoJournal of the American Chemical Society · 2025Article
- Evaluation of Zeolite Composites by IR and NMR Spectroscopy.Molecules (Basel, Switzerland) · 2024Article
- Modulating acid sites in Y zeolite for valorisation of furfural to get γ-valerolactone.RSC advances · 2024Article
- The need forChemical science · 2023Article
- Tuning the catalytic acidity in AlCatalysis science & technology · 2022Article
- The concept of active site in heterogeneous catalysis.Nature reviews. Chemistry · 2022Review
- Micro/mesoporous LTL derived materials for catalytic transfer hydrogenation and acid reactions of bio-based levulinic acid and furanics.Frontiers in chemistry · 2022Article
- Distribution of Aluminum Species in Zeolite Catalysts:Journal of the American Chemical Society · 2021Article
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Authors and funding
3 authors at 2 institutions in 2 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Lewis acidic aluminum in zeolites, particularly acidity that is inherent to the framework, is an indeterminate concept. A fraction of framework aluminum changes geometry to octahedral coordination in the proton form of zeolite mordenite. Such octahedrally coordinated aluminum is the precursor of a Lewis acid site and its formation is accompanied by a loss in Brønsted acidity. Herein, we show that such Lewis acid sites have a preferred location in the pore structure of mordenite. A greater proportion of these Lewis acid sites resides in the side-pockets than in the main channel. By reverting the octahedrally coordinated aluminum back to a tetrahedral geometry, the corresponding Brønsted acid sites are restored with a concomitant loss in the ability to form Lewis acid sites. Thereby, reversible octahedral-tetrahedral aluminum coordination provides a means to indirectly switch between Lewis and Brønsted acidity. This phenomenon is unique to Lewis acidity that is inherent to the framework, thereby distinguishing it from Lewis acidity originating from extra-framework species. Furthermore, the transformation of framework aluminum into octahedral coordination is decoupled from the generation of distorted tetrahedrally coordinated aluminum, where the latter gives rise to the IR band at 3660 cm
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