Low reactivity of Rhx clusters produced in the presence of CO

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Rhodium dicarbonyl, RhI(CO)2, produced by the CO-induced disruption of Rhx crystallites at and below 300 K, undergoes reductive agglomeration in the presence of CO above 448 K or during the high-temperature reaction involving CO. The Rhx clusters formed at 523-573 K exhibit a much lower reactivity toward CO than that of the sample produced by reduction with H2 at 1173 K: no or only a limited re-formation of RhI(CO)2 was observed. The effects of several factors are examined. It appears that the surface C produced in the CO dissociation plays a dominant role in preventing the occurrence of the CO-induced disruption at low temperature. The regeneration of reactive Rhx clusters can be achieved only by oxidative and reductive treatment at 673 K.

Original languageEnglish
Pages (from-to)10133-10138
Number of pages6
JournalJournal of physical chemistry
Issue number39
Publication statusPublished - Dec 1 1993


ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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