Adsorption of bimetallic molecular clusters

Supported bimetallic catalysts can be made by adsorption of a bimetallic precursor such as molecular cluster compounds, colloidal particles or dendrimer-stabilised particles. In several cases, homogeneous bimetallic particles have been found where the compositions lie within the miscibility gap of the bulk alloy (e.g. with PtAu particles). This suggests that when the particles are small enough and do not possess metallic properties, the normal rules do not apply. 

Bimetallic molecular cluster compounds containing gold will adsorb intact on supports, and the ligands may then be removed by heating, but only a few such compounds are available. Simple carbonyl complexes do not exist, 

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Mixed metal catalysts can also be made using PVD [41,42] and by activation of rapidly quenched metal alloys such as Au5FeZni4 and Au5Ag Zn,4 under CO oxidation conditions at 553 K [52]. Other methods for preparing mixed metal catalysts include the use of dendrimer-stabilized bimetallic particles, and adsorption of bimetallic molecular clusters [2],... 

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