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Anomalous small-angle x-ray scattering from mesoporous noble metal catalysts

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Abstract

We present the analysis of a catalyst containing platinum nanoparticles supported on mesoporous MCM-41 silica by anomalous small-angle x-ray scattering (ASAXS). The analysis of this composite system by ASAXS is first studied by use of model calculation. Here, it is shown that the full analysis must proceed by decomposing the scattering data measured at different energies of the incident beam into three partial intensities. This evaluation is compared to a simplified method in which scattering curves measured at two different energies are subtracted from each other. The different methods are applied to experimental data obtained from platinum nanoparticles on an MCM-41 support material. The model calculations show that the simplified method leads to large deviations especially at low q in ordered systems. In the semi-ordered material MCM-41, these deviations are less pronounced, and the method of simple subtraction proves to be a good approximation for q values higher than 0.1 nm−1.

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Acknowledgments

The authors would like to thank Prof. Dr. Armin Feldhoff of the Leibniz Universität Hannover, Germany, for taking the TEM micrographs. Part of this work was funded by the Ministry of Science, Research and the Arts as well as the Landesstiftung foundation of Baden Wuerttemberg (Az: 23-720.431-1.8/1)

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Authors and Affiliations

  1. Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109, Berlin, Germany

    Karsten Vogtt, Guenter Goerigk & Matthias Ballauff

  2. Institute of Physics, Humboldt University Berlin, Newtonstr. 15, 12489, Berlin, Germany

    Matthias Ballauff

  3. Institut für Technische Chemie, Fakultät für Chemie und Mineralogie, Linnéstr. 3, 04103, Leipzig, Germany

    Roger Gläser

  4. Institut für Technische Chemie und Polymerchemie, Karlsruher Institut für Technologie (KIT), Engesserstraße 18, 76128, Karlsruhe, Germany

    Nico Dingenouts

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  1. Karsten Vogtt
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  2. Guenter Goerigk
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Correspondence to Karsten Vogtt or Roger Gläser.

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Vogtt, K., Goerigk, G., Ballauff, M. et al. Anomalous small-angle x-ray scattering from mesoporous noble metal catalysts. Colloid Polym Sci 291, 2163–2171 (2013). https://doi.org/10.1007/s00396-013-2951-8

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  • DOI: https://doi.org/10.1007/s00396-013-2951-8

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