Chemical and Biological Engineering, Chemistry, Materials Science and Engineering, Physics and Astronomy, Ames Laboratory
Journal or Book Title
Journal of the American Chemical Society
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.
American Chemical Society
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.; and Pruski, Marek, "Characterizing Substrate–Surface Interactions on Alumina-Supported Metal Catalysts by Dynamic Nuclear Polarization-Enhanced Double-Resonance NMR Spectroscopy" (2017). Materials Science and Engineering Publications. 354.