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Hydrogen Production from Ethanol over Rh–Pd/CeO2 Catalysts

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Abstract

The work presents a study by temperature programmed desorption, in situ infra red spectroscopy and catalytic steam reforming of ethanol (SRE) over CeO2 and the bimetallic Pd-Rh/CeO2; comparison with the monometallic catalysts (Rh/CeO2 and Pd/CeO2) was also made for the steam reforming study. Comparing TPD of ethanol over CeO2 and the bimetallic catalysts indicated two main differences: the direct oxidation route to acetate over CeO2 is suppressed by the presence of the metal and the lowering of the dehydrogenation reaction temperature by about 100 K. In situ IR study indicated that the bimetallic catalyst breaks the carbon–carbon bond of ethanol at low temperature <400 K, as evidenced by the presence of adsorbed CO species. SRE over ½ wt.% Rh–½ wt.% Pd/CeO2, at 770 K at realistic conditions showed that maximum conversion and selectivity could be achieved. This high activity considering the very small amounts of transition metals on CeO2 is discussed in light of their electronic and geometric effects.

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Acknowledgments

The authors acknowledge the VC fund of the University of Auckland for a research grant. M.S. and H·I. thank Industrial Research Limited (Christchurch) and Arnold Corp. (Wellington) for their financial support.

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Author notes

  1. H. Idriss

    Present address: Department of Chemistry, University of Aberdeen, Aberdeen, AB24 3EU, Scotland, UK

Authors and Affiliations

  1. Department of Chemistry, The University of Auckland, Private Bag 92019, Auckland, New Zealand

    M. Scott, M. Goeffroy, W. Chiu & H. Idriss

  2. Institute of Materials and Engineering Science, ANSTO, PMB 1, Menai, NSW, 2234, Australia

    M. A. Blackford

Authors
  1. M. Scott
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  2. M. Goeffroy
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  3. W. Chiu
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Correspondence to H. Idriss.

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Scott, M., Goeffroy, M., Chiu, W. et al. Hydrogen Production from Ethanol over Rh–Pd/CeO2 Catalysts. Top Catal 51, 13–21 (2008). https://doi.org/10.1007/s11244-008-9125-9

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  • DOI: https://doi.org/10.1007/s11244-008-9125-9

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