文摘
Pt-Sn bimetallic catalysts dispersed on alumina are commonly used for reforming and dehydrogenation reactions. In this research work, Pt and Sn were supported on titania. The resulting interactions between the components in the prepared samples, before and after treatment with hydrogen, were studied by M?ssbauer spectroscopy, X-ray diffraction and Rietveld refinement. The results show the presence of Pt and SnO2 after calcinations. After the reduction process, metallic Pt, PtSn, and Pt3Sn alloys were identified. The Rietveld refinement analysis shows that some Ti4+ atoms were replaced by Sn4+ atoms in the titania structure. Finally, the M?ssbauer spectroscopy and X-ray diffraction results indicate that metallic platinum and SnO2 are encapsulated by a TiOx layer.