Summary of the JASIN 1978 field experiment

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Abstract
Two examples of catalysis by supported clusters are given that involve a molecular cluster frame during the catalytic cycle. [Note: Equation omitted. See the image of page 115 for this equation.] is able to hydrogenate ethylene between 343 and 373 K. The mechanism of this reaction, which involves the molecular cluster frame, requires the opening of the bridging three-electron oxygen ligand as the key step of the catalytic process. Rh$_{6}$(CO)$_{16}$ adsorbed on alumina is a catalyst for the water-gas shift reaction carried out between 293 and 393 K. The mechanism of this reaction involves three steps: (i) electrophilic attack by surface protons on the metallic frame with formation of Rh$^{\text{I}}$(CO)$_{2}$ and Rh$^{\text{III}}$(H)(H) species; (ii) reductive elimination of H$_{2}$ favoured by CO coordination to the Rh$^{\text{III}}$(H)(H) species; (iii) nucleophilic attack by molecular water on CO coordinated to Rh$^{\text{I}}$ with regeneration of the starting cluster, release of CO$_{2}$ and surface protons.

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