Characterization of bifunctional PtSn/H[Al]ZSM5 catalysts: a comparison between two impregnation strategies

The type of impregnation strategy used to prepare PtSn/H[Al]ZSM5 catalysts lead to pronounced changes in the catalytic behavior because of the presence of an electronic effect between Pt and Sn for the co-impregnated samples and a geometric effect for the sequentially impregnated samples. All samples were characterized by using the toluene hydrogenation reaction, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy.