Natural Abundance 17 O DNP NMR Provides Precise O-H Distances and Insights into the Brønsted Acidity of Heterogeneous Catalysts

Angewandte Chemie
Frédéric A PerrasMarek Pruski

Abstract

Heterogeneous Brønsted acid catalysts are tremendously important in industry, particularly in catalytic cracking processes. Here we show that these Brønsted acid sites can be directly observed at natural abundance by 17 O DNP surface-enhanced NMR spectroscopy (SENS). We additionally show that the O-H bond length in these catalysts can be measured with sub-picometer precision, to enable a direct structural gauge of the lability of protons in a given material, which is correlated with the pH of the zero point of charge of the material. Experiments performed on materials impregnated with pyridine also allow for the direct detection of intermolecular hydrogen bonding interactions through the lengthening of O-H bonds.

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Citations

Mar 22, 2018·Chemical Communications : Chem Comm·Frédéric A PerrasMarek Pruski
Apr 3, 2019·Chemical Communications : Chem Comm·Hamish C CraigJames M Hook
Jul 19, 2020·Nature Communications·Qiang WangFeng Deng
Aug 30, 2019·Physical Chemistry Chemical Physics : PCCP·Frédéric A PerrasMarek Pruski
Jan 15, 2021·Physical Chemistry Chemical Physics : PCCP·Diego CarnevaleDaniel Abergel
Dec 11, 2020·Magnetic Resonance in Chemistry : MRC·Hiroki NagashimaJean-Paul Amoureux
Jan 16, 2021·Solid State Nuclear Magnetic Resonance·Frédéric A PerrasTakeshi Kobayashi
Feb 23, 2021·The Journal of Physical Chemistry Letters·Christopher P GordonChristophe Copéret
Jan 23, 2019·Solid State Nuclear Magnetic Resonance·Frédéric A PerrasMarek Pruski
Aug 24, 2017·Solid State Nuclear Magnetic Resonance·Takeshi KobayashiMarek Pruski
Jun 13, 2019·Solid State Nuclear Magnetic Resonance·Andrew G M RankinOlivier Lafon
May 22, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Takeshi Kobayashi, Marek Pruski
Jul 10, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Ashlea R HughesFrédéric Blanc
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