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Particle size dependent CO dissociation on alumina-supported Rh: a model study

MPS-Authors
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Frank,  Martin
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Libuda,  Jörg
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Stempel,  S.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Bäumer,  Marcus
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

Frank, M., Andersson, S., Libuda, J., Stempel, S., Sandell, A., Brena, B., et al. (1997). Particle size dependent CO dissociation on alumina-supported Rh: a model study. Chemical Physics Letters, 279(1-2), 92-99. doi:10.1016/S0009-2614(97)01114-7.


Cite as: https://hdl.handle.net/21.11116/0000-0008-B693-4
Abstract
Via deposition of Rh from the gas phase onto a thin, well-ordered alumina film we have prepared various of alumina-supported Rh particle systems. The morphologies and particle sizes have been characterised with spot profile analysis LEED and STM measurements. The probabilities for thermally induced dissociation of adsorbed CO at temperatures between 350 and 500 K were determined from C 1s photoelectron spectra. For small aggregates the dissociation activity increases with increasing average particle size. After reaching a maximum for particles containing an average of 500 to 1000 Rh atoms, the fraction of dissociated CO decreases to values closer to those observed well-prepared Rh single crystal surfaces.