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MgO-supported cluster catalysts with Pt–Ru interactions prepared from Pt3Ru6(CO)21(μ3-H)(μ-H)3

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Abstract

Bimetallic MgO-supported catalysts were prepared by adsorption of Pt3Ru6(CO)21(μ3-H)(μ-H)3 on porous MgO. Characterization of the supported clusters by infrared (IR) spectroscopy showed that the adsorbed species were still in the form of metal carbonyls. The supported clusters were decarbonylated by treatment in flowing helium at 300 °C, as shown by IR and extended X-ray absorption fine structure (EXAFS) data, and the resulting supported PtRu clusters were shown by EXAFS spectroscopy to have metal frames that retained Pt–Ru bonds but were slightly restructured relative to those of the precursor; the average cluster size was almost unchanged as a result of the decarbonylation. These are among the smallest reported bimetallic clusters of group-8 metals. The decarbonylated sample catalyzed ethylene hydrogenation with an activity similar to that reported previously for γ-Al2O3-supported clusters prepared in nearly the same way and having nearly the same structure. Both samples were also active for n-butane hydrogenolysis, with the MgO-supported catalyst being more active than the γ-Al2O3-supported catalyst.

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Acknowledgments

We thank N. E. Schore of the University of California, Davis, for access to synthesis equipment. Financial support for S. C. was provided by the Ministry of University Affairs and Prince of Songkla University, Pattani Campus, Thailand; support was also provided by the U.S. Department of Energy, Office of Energy Research, Office of Basic Energy Sciences (Contract FG02–87ER13790). EXAFS experiments were performed at beamline X-18B at the National Synchrotron Light Source, BNL. The EXAFS data were analyzed with the software XDAP [10].

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, University of California, Davis, CA, USA

    Saowapa Chotisuwan, Rodrigo J. Lobo-Lapidus & Bruce C. Gates

  2. School of Chemistry, Suranaree University of Technology, Nakhon Ratchasima, Thailand

    Saowapa Chotisuwan & Jatuporn Wittayakun

  3. Department of Science, Prince of Songkla University, Pattani, Thailand

    Saowapa Chotisuwan

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  1. Saowapa Chotisuwan
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  2. Jatuporn Wittayakun
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  3. Rodrigo J. Lobo-Lapidus
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  4. Bruce C. Gates
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Correspondence to Bruce C. Gates.

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Chotisuwan, S., Wittayakun, J., Lobo-Lapidus, R.J. et al. MgO-supported cluster catalysts with Pt–Ru interactions prepared from Pt3Ru6(CO)21(μ3-H)(μ-H)3 . Catal Lett 115, 99–107 (2007). https://doi.org/10.1007/s10562-007-9119-4

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  • DOI: https://doi.org/10.1007/s10562-007-9119-4

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