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Perras, Frédéric A; Padmos, J. Daniel; Johnson, Robert L; Wang, Lin-Lin; Schwartz, Thomas J; Kobayashi, Takeshi; Horton, J. Hugh; Dumesic, James A; Shanks, Brent H; Johnson, Duane D; Pruski, Marek
Journal of the American Chemical Society, 02/2017, Letnik: 139, Številka: 7Journal Article
The characterization of nanometer-scale interactions between carbon-containing substrates and alumina surfaces is of paramount importance to industrial and academic catalysis applications, but it is also very challenging. Here, we demonstrate that dynamic nuclear polarization surface-enhanced NMR spectroscopy (DNP SENS) allows the unambiguous description of the coordination geometries and conformations of the substrates at the alumina surface through high-resolution measurements of 13C–27Al distances. We apply this new technique to elucidate the molecular-level geometry of 13C-enriched methionine and natural abundance poly(vinyl alcohol) adsorbed on γ-Al2O3-supported Pd catalysts, and we support these results with element-specific X-ray absorption near-edge measurements. This work clearly demonstrates a surprising bimodal coordination of methionine at the Pd–Al2O3 interface.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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