Brønsted acid sites based on penta-coordinated aluminum species

Zichun Wang, Yijiao Jiang, Olivier Lafon, Julien Trébosc, Kyung Duk Kim, Catherine Stampfl, Alfons Baiker, Jean-Paul Amoureux () and Jun Huang ()
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Zichun Wang: Laboratory for Catalysis Engineering, School of Chemical and Biomolecular Engineering, Sydney University
Yijiao Jiang: Macquarie University
Olivier Lafon: Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide
Julien Trébosc: Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide
Kyung Duk Kim: Laboratory for Catalysis Engineering, School of Chemical and Biomolecular Engineering, Sydney University
Catherine Stampfl: School of Physics, Sydney University
Alfons Baiker: Institute for Chemical and Bioengineering, ETH Zürich, Hönggerberg, HCI
Jean-Paul Amoureux: Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide
Jun Huang: Laboratory for Catalysis Engineering, School of Chemical and Biomolecular Engineering, Sydney University

Nature Communications, 2016, vol. 7, issue 1, 1-5

Abstract: Abstract Zeolites and amorphous silica-alumina (ASA), which both provide Brønsted acid sites (BASs), are the most extensively used solid acid catalysts in the chemical industry. It is widely believed that BASs consist only of tetra-coordinated aluminum sites (AlIV) with bridging OH groups in zeolites or nearby silanols on ASA surfaces. Here we report the direct observation in ASA of a new type of BAS based on penta-coordinated aluminum species (AlV) by 27Al-{1H} dipolar-mediated correlation two-dimensional NMR experiments at high magnetic field under magic-angle spinning. Both BAS-AlIV and -AlV show a similar acidity to protonate probe molecular ammonia. The quantitative evaluation of 1H and 27Al sites demonstrates that BAS-AlV co-exists with BAS-AlIV rather than replaces it, which opens new avenues for strongly enhancing the acidity of these popular solid acids.

Date: 2016
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DOI: 10.1038/ncomms13820

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