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  • 1 University of Tokyo Department of Chemistry, Faculty of Science Hongo Tokyo Japan
  • 2 Sagami Chemical Research Center Nishi-Ohnuma, Sagamihara Kanagawa Japan
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Silica supported Rh–Fe catalysts were characterized by means of in situ57Fe Mössbauer spectroscopy. The Mössbauer spectra indicated that iron on the silica support existed either as Fe/O/ in the Rh–Fe alloy or as Fe3+ in Rh–Fe metal cluster compounds. The (Fe3+/Fe/O/) ratio and Mössbauer parameters were found to depend on the (Fe/Rh) atomic ratio in the catalysts. Such dependence corresponded to the change of catalytic properties of the supported Rh–Fe catalyst with the varying (Fe/Rh) ratio.