An ESCA Study of Alkali Protomer Effects on Silica-Supported Ruthenium Catalysts

Article abstract of DOI:10.1021/j100269a020

An ESCA study has been carried out to characterize the effect of alkali promotion on ruthenium-silica catalysts.Alkali promotion of Ru was found to result in a significant increase in the atomic relaxation energy in addition to a presumed reduction in the work function.While it was not possible to determine the amount, if any, of electron charge transfer from the promoter to the Ru, it was also not possible to rule out such a transfer.The anions associated with the elkali ions, however, appeared to have little effect on the electronic structure of the Ru.The study reported in this paper is one of the most complete investigations to date of the modification by alkali promotion of the electronic structure of a supported transition-metal catalyst.