MOSSBAUER SPECTROSCOPIC CHARACTERIZATION OF CATALYSTS OBTAINED BY INTERACTION BETWEEN TETRA-N-BUTYL-TIN AND SILICA OR SILICA-SUPPORTED RHODIUM

Mossbauer spectroscopy at 78 K was used to study the interaction betwe en tetra-n-butyl-tin and the surfaces of silica or silica supported rh odium. At room temperature, the tetra-n-butyl-tin was physically adsor bed on the surfaces. After reaction under hydrogen at 373 K, the forma tion of grafted organometallic fragments on the Ph surface was confirm ed whereas with pure silica, =SiO-Sn(n-C4H9)(3) moieties were observed . After treatment at 523 K, the rhodium grafted organometallic species was completely decomposed and there was formation of a defined bimeta llic RhSn compound.