Brønsted acid sites based on penta-coordinated aluminum species.
- Wang Z Laboratory for Catalysis Engineering, School of Chemical and Biomolecular Engineering, Sydney University, Chemical Engineering Building J01, Sydney, New South Wales 2006, Australia.
- Jiang Y Department of Engineering, Macquarie University, Sydney, New South Wales 2109, Australia.
- Lafon O Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France.
- Trébosc J Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France.
- Duk Kim K Laboratory for Catalysis Engineering, School of Chemical and Biomolecular Engineering, Sydney University, Chemical Engineering Building J01, Sydney, New South Wales 2006, Australia.
- Stampfl C School of Physics, Sydney University, Sydney, New South Wales 2006, Australia.
- Baiker A Institute for Chemical and Bioengineering, Department of Chemistry and Applied Bioscience, ETH Zürich, Hönggerberg, HCI, CH-8093 Zürich, Switzerland.
- Amoureux JP Univ. Lille, CNRS, UMR 8181-UCCS, Unité de Catalyse et de Chimie du Solide, F-59000 Lille, France.
- Huang J Laboratory for Catalysis Engineering, School of Chemical and Biomolecular Engineering, Sydney University, Chemical Engineering Building J01, Sydney, New South Wales 2006, Australia.
- 2016-12-16
Published in:
- Nature communications. - 2016
English
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.
- Language
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- English
- Open access status
- gold
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- DOI 10.1038/ncomms13820
- PMID 27976673
- Persistent URL
- https://sonar.ch/global/documents/127159
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