Synthesis and Structural Characterization of SiO2-Supported PtFe Catalysts Prepared from PtFe2(C8H12)(CO)8

摘要: Fourier transform infrared (FTIR) and extended X-ray absorption fine structure (EXAFS) spectroscopies were used to characterize the species formed following deposition of a PtFe2(COD)(CO)8 cluster on SiO2 removal organic ligands. The results indicate that initially adsorbs weakly surface but loses fraction ligands during aging under N2 thus becomes bonded surface. PtFe2 core remains nearly intact this process. can be further removed from freshly impregnated by thermal treatments in either He or H2 at 350 °C. Both lead formation bimetallic with average dimensions order 1 nm. However, these PtFe undergo substantial structural changes CO oxidation conditions.