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Finite size effects on supported Pd nanoparticles: Interaction of hydrogen with CO and C2H4

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Morkel,  Matthias
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Rupprechter,  Günther
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Morkel, M., Rupprechter, G., & Freund, H.-J. (2005). Finite size effects on supported Pd nanoparticles: Interaction of hydrogen with CO and C2H4. Surface Science Letters, 588(1-3), L209-L219. doi:10.1016/j.susc.2005.05.037.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-07D5-D
Abstract
Pd-hydride formation proceeds predominantly via minority sites on Pd nanoparticles (defects and (1 0 0) facets). Finite size effects govern the surface chemistry, e.g. “explosive” hydrogen desorption in the presence of a CO overlayer originates from the confinement of dissolved hydrogen within the limited nanoparticle volume. In situ surface vibrational spectra, acquired during CO hydrogenation under technical conditions, suggest surface roughening or a partly disordered CO adsorbate phase that only occur at elevated pressure. The presence of Pd-hydride phases yielded a very high activity for C2H4 hydrogenation on the Pd nanoparticles which may again be related to the hydrogen confinement effect.