Various Metals (Ce, In, La, and Fe) Promoted Pt/Sn-SBA-15 as Highly Stable Catalysts for Propane Dehydrogenation

The various metals promoted Pt/Sn-SBA-15 catalysts (MPt/SSF, M = Ce, In, La, and Fe) were prepared by a conventional coimpregnation method and then were characterized by N2 adsorption/desorption, XRD, XPS, H2-TPR, H2-TPD, CO2-TPD, Raman, and TG techniques. The track of Sn species was not detected by XRD and XPS analysis due to its rather low content and location in the framework of silica. The redox property and the surface composition together with the lattice oxygen capacity of catalysts were significantly affected by the nature of promotors. The results further implied that the lattice oxygen played an important role in determining the initial activity in propane dehydrogenation as a linear relationship was achieved, while the integrated impacts of redox property, antisintering ability, and resistance to coke deposition were responsible for catalytic stability. The sample FePt/SSF showed maximum initial propane conversion of 56.8%, while the InPt/SSF exhibited the best performance during the catalytic stability test.