A novel insight into enhanced propane combustion performance onPtUSY catalyst

Platinum was supported on γ-A1203 and ultra-stable Y zeolite （USY） by an incipient wetness impregna-tion method. The catalysts were characterized by nitrogenphysisorption, transmission electron microscopy （TEM）,CO/C3H8 isothermal oxidations, NH3 temperature-pro-grammed desorption （NH3-TPD） and infrared （IR） spec-troscopy of adsorbed probe molecules （CO, C3H8 and C3H8＋ 02）. Compared with Pt/Al2O3, PtUSY catalystshows obviously higher activity for the combustion ofpropane. After estimating the size effect of Pt particles andpropane adsorption capacity of USY, the excellent activityof PtUSY is also attributed to the strong interactionsbetween the precious metal and the acidic zeolite. It inhi-bits the oxidation of Pt in an oxygen-rich atmosphere athigh temperatures, which facilitate the initial oxidation stepinvolving the C-H bond activation on metallic Pt asreflected by in situ diffuse reflectance infrared Fourier-transformed （DRIFT） spectra.