Brønsted acid sites based on penta-coordinated aluminum species

被引：0
作者：
Zichun Wang
Yijiao Jiang
Olivier Lafon
Julien Trébosc
Kyung Duk Kim
Catherine Stampfl
Alfons Baiker
Jean-Paul Amoureux
Jun Huang
机构：
[1] Laboratory for Catalysis Engineering,Department of Engineering
[2] School of Chemical and Biomolecular Engineering,Department of Chemistry and Applied Bioscience
[3] Sydney University,undefined
[4] Macquarie University,undefined
[5] Univ. Lille,undefined
[6] CNRS,undefined
[7] UMR 8181-UCCS,undefined
[8] Unité de Catalyse et de Chimie du Solide,undefined
[9] School of Physics,undefined
[10] Sydney University,undefined
[11] Institute for Chemical and Bioengineering,undefined
[12] ETH Zürich,undefined
[13] Hönggerberg,undefined
[14] HCI,undefined
来源：
Nature Communications | / 7卷
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摘要：
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.
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