Interfacial charge distributions in carbon-supported palladium catalysts

Nature Communications - Tập 8 Số 1
Radhika G. Rao1, Raoul Blume2, Thomas W. Hansen3, Erika Fuentes4, Kathleen Dreyer5, Simona Moldovan6, Ovidiu Ersen6, David Hibbitts5, Yves Chabal4, R. Schlögl2, Jean‐Philippe Tessonnier7
1Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
2Fritz Haber Institute of the, Max Planck Society, DE-14195, Berlin, Germany
3Center for Electron Nanoscopy, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
4Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, TX 75080, USA
5Department of Chemical Engineering University of Florida Gainesville FL 32611 USA
6Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 University of Strasbourg – CNRS, FR-67200, Strasbourg, France
7NSF Engineering Research Center for Biorenewable Chemicals, Ames, IA, 50011, USA

Tóm tắt

AbstractControlling the charge transfer between a semiconducting catalyst carrier and the supported transition metal active phase represents an elite strategy for fine turning the electronic structure of the catalytic centers, hence their activity and selectivity. These phenomena have been theoretically and experimentally elucidated for oxide supports but remain poorly understood for carbons due to their complex nanoscale structure. Here, we combine advanced spectroscopy and microscopy on model Pd/C samples to decouple the electronic and surface chemistry effects on catalytic performance. Our investigations reveal trends between the charge distribution at the palladium–carbon interface and the metal’s selectivity for hydrogenation of multifunctional chemicals. These electronic effects are strong enough to affect the performance of large (~5 nm) Pd particles. Our results also demonstrate how simple thermal treatments can be used to tune the interfacial charge distribution, hereby providing a strategy to rationally design carbon-supported catalysts.

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