Abstract
A Rh K EXAFS study showed that the rhodium particles in a Rh/Ta2O5 catalyst were fully reduced and in the ‘normal’ state after reduction in H2 at 523 K. The metal particles contained about 73 rhodium metal atoms and had a diameter of 17 Å. After reduction at 858 K the catalyst was in the SMSI state. In addition to a contribution from rhodium nearest neighbours, two contributions from neighbouring tantalum ions could be detected. The tantalum ions were located in the reduced supporting oxide directly underneath the rhodium metal particles and in tantalum oxide covering the rhodium metal particles. Neither alloy formation, nor the formation of pillboxes or raftlike structures was observed.
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