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- W2065573642 abstract "We have studied the oxidation of MgO(100) supported Pd nanoparticles in a size range from $4phantom{rule{0.3em}{0ex}}text{to}phantom{rule{0.3em}{0ex}}24phantom{rule{0.3em}{0ex}}mathrm{nm}$ at $570phantom{rule{0.3em}{0ex}}mathrm{K}$ and near atmospheric pressures. Our experimental setup using high-energy x rays allows us to study in situ the oxidation behavior for different particle sizes under identical experimental conditions. We can identify three size regimes with a distinct oxidation mechanism. For particles smaller than $5phantom{rule{0.3em}{0ex}}mathrm{nm}$ in diameter, kinetic barriers for bulk oxide formation are strongly reduced and complete transformation to PdO bulk oxide takes place, epitaxial to the MgO substrate. Particles with a diameter $5phantom{rule{0.3em}{0ex}}mathrm{nm}$ $<D<9phantom{rule{0.3em}{0ex}}mathrm{nm}$ undergo continuous shrinkage during oxidation accompanied by the formation of epitaxial PdO on MgO(100). For larger particles with $D>9phantom{rule{0.3em}{0ex}}mathrm{nm}$, we observe a complete passivation of the particle surface by a thin polycrystalline PdO layer, which prevents further oxidation. Our experiments demonstrate that particles with a few nanometers in size exhibit a much higher reactivity with oxygen, which is important for the performance of Pd nanoparticles as a CO oxidation catalyst." @default.
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- W2065573642 date "2008-03-24" @default.
- W2065573642 modified "2023-10-14" @default.
- W2065573642 title "Combinatorial high-energy x-ray microbeam study of the size-dependent oxidation of Pd nanoparticles on MgO(100)" @default.
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- W2065573642 doi "https://doi.org/10.1103/physrevb.77.115444" @default.
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