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dc.contributor.author
Wang, Zichun
dc.contributor.author
Jiang, Yijiao
dc.contributor.author
Lafon, Olivier
dc.contributor.author
Trébosc, Julien
dc.contributor.author
Kim, Kyung D.
dc.contributor.author
Stampfl, Catherine
dc.contributor.author
Baiker, Alfons
dc.contributor.author
Amoureux, Jean-Paul
dc.contributor.author
Huang, Jun
dc.date.accessioned
2018-09-12T12:02:50Z
dc.date.available
2017-06-12T17:55:59Z
dc.date.available
2018-09-12T12:02:50Z
dc.date.issued
2016
dc.identifier.issn
2041-1723
dc.identifier.other
10.1038/ncomms13820
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/125018
dc.identifier.doi
10.3929/ethz-b-000125018
dc.description.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.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Nature Publishing Group
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Brønsted acid sites based on penta-coordinated aluminum species
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2016-12-15
ethz.journal.title
Nature Communications
ethz.journal.volume
7
en_US
ethz.journal.abbreviated
Nat Commun
ethz.pages.start
13820
en_US
ethz.size
5 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
007044158
ethz.publication.place
London
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-12T17:56:53Z
ethz.source
ECIT
ethz.identifier.importid
imp59365508b96f568620
ethz.ecitpid
pub:187583
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-20T13:01:47Z
ethz.rosetta.lastUpdated
2020-02-15T14:59:55Z
ethz.rosetta.versionExported
true
ethz.COinS
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