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Surface Chemistry of Zirconia-Supported Rhodium Carbonyl Clusters

Elsevier Science & Technology
DOI: 10.1016/s0167-2991(08)60755-7
  • Musicology
  • Physics


CO hydrogenation catalyst precursors prepared by adsorbing Rh4(CO)12 and Mo(CO)6 on ZrO2 were studied by Fourier transform infrared photoacoustic spectroscopy and by temperature-programmed desorption. Rh4(CO)12/ZrO2 evolves, at temperature near ambient, to a system dominated by Rh1(CO)2 species through a mechanism involving CO dissociation. The small Rh crystallites formed by reduction of the sample at 523 K are disrupted and converted to the same Rh1 species when exposed to CO at 305 K. Mo enhances CO dissociation and favours the oxidative interaction of surface hydroxyls with Rh0 species at about 500 K; the promotion effect of Mo in CO hydrogenation is discussed in connection with these results.

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