The elementary steps in the surface reactions of the transition metal carbonyl clusters on alumina and silica leading to small metal particles have been investigated. It was established that after the initial interaction with the surface oxygen or hydroxyl groups the carbonyl clusters undergo disruption including metal-metal bond rupture to form monometallic dicarbonyl species which are responsible for highly dispersed metal particles on the alumina surface. In contrast, on the silica surface there are several surface transformations of the original cluster framework including the build-up of a framework with higher nuclearity which ultimately leads to metal particles larger in size than those formed on alumina. The difference is reflected in the catalytic properties of the supported catalysts formed from the carbonyl clusters.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry