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Brønsted acid sites based on penta-coordinated aluminum species

Author

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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)

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.

Suggested Citation

  • Zichun Wang & Yijiao Jiang & Olivier Lafon & Julien Trébosc & Kyung Duk Kim & Catherine Stampfl & Alfons Baiker & Jean-Paul Amoureux & Jun Huang, 2016. "Brønsted acid sites based on penta-coordinated aluminum species," Nature Communications, Nature, vol. 7(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13820
    DOI: 10.1038/ncomms13820
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    Cited by:

    1. Huang, Jijiang & Veksha, Andrei & Chan, Wei Ping & Giannis, Apostolos & Lisak, Grzegorz, 2022. "Chemical recycling of plastic waste for sustainable material management: A prospective review on catalysts and processes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 154(C).

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