Preparation of Pt/Mn-silicalite-1 Catalysts and Their Catalytic Performance for Propane Dehydrogenation

As one of the important components of natural gas and shale gas, the catalytic conversion of propane not only has important theoretical research significance but also has broad prospects in application. Propane dehydrogenation is one of the important ways to enhance the production of propylene, and the key of this reaction is to improve the stability of Pt-based catalysts and minimize the amount of Pt. In this work, the Mn-doped silicalite-1(S-1) supports (xMn-S-1) with different Mn doping amounts were designed, and prepared a series of Pt/xMn-S-1 catalysts was prepared by loading Pt. The scanning electron microscope(SEM), X-ray diffraction(XRD), Raman spectra and ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS) characterizations were carried out, and the catalytic performance was tested for propane dehydrogenation. According to the characterizations, the Mn species enter the framework of S-1 to form Mn-O-Si by coordinating with EDTA, which can anchor the Pt species to form highly dispersed Pt species. According to the activity evaluation, Pt/0.05Mn-S-1 catalyst showed the best dehydroge & hybull; nation performance with the propane initial conversion of 51.9%. And the propane conversion was 36.7% after 6 h reaction. The reason may be the strong interaction formed between the Mn-S-1 support and active metal Pt with the appropriate amount of Mn doping, which results in the enhanced propane dehydrogenation activity and stability over Pt/0.05Mn-S-1 catalyst.