XPS Study of a New Heterogeneous Ruthenium Catalyst Precursor

The catalyst precursor has been synthesized by modifying the silica surface with ClPPh 2 followed by a surface reaction with RuCl 3 . Supports consisting of a thin layer of SiO 2 on a silicon single crystal have been used. Characterization of the different stages in the reaction procedure has been performed by a combination of conventional and angle-resolved X-ray photoelectron spectroscopy (XPS) using RuCl 3 /P(C 6 H 5 ) 2 /SiO 2 /Si(100) model precursors. Different types of ruthenium centra have been identified.