New approaches to prepare supported Sn-Pt bimetallic catalysts

General principles of modification of supported Pt catalysts with tin tetra alkyls are summarized and a new approach to prepare supported Sn-Pt catalys ts is described. The new approach leads to the formation of Multilayered Or ganometallic Complexes (MLOC) anchored onto supported platinum. The formed MLOC can be decomposed either in reductive or oxidative atmosphere with the formation of new type of supported Sn-Pt catalysts with high Sn/Pt-s ratio s. The decomposition in a reductive atmosphere leads to the formation of al loy-type bimetallic phases, while the decomposition in the presence of oxyg en provides Lewis-acid type surface species anchored to supported platinum.