A novel insight into enhanced propane combustion performance on PtUSY catalyst  

作　　者：Hui Luo Xiao-Dong Wu Duan Weng Shuang Liu Rui Ran 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China [2]The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering,Tsinghua University, Beijing 100084, China

出　　处：《Rare Metals》2017年第1期1-9,共9页稀有金属（英文版）

基　　金：financially supported by the Ministry of Science and Technology of China (No. 2013AA061902);the Ministry of Education of China (No. 113007A);financial support from the State Key Laboratory of New Ceramics and Fine Processing

摘　　要：Platinum was supported on c-AlOand ultrastable Y zeolite(USY) by an incipient wetness impregnation method. The catalysts were characterized by nitrogen physisorption, transmission electron microscopy(TEM),CO/CHisothermal oxidations, NHtemperature-programmed desorption(NH–TPD) and infrared(IR) spectroscopy of adsorbed probe molecules(CO, CHand CH+ O). Compared with Pt/AlO, Pt USY catalyst shows obviously higher activity for the combustion of propane. After estimating the size effect of Pt particles and propane adsorption capacity of USY, the excellent activity of Pt USY is also attributed to the strong interactions between the precious metal and the acidic zeolite. It inhibits the oxidation of Pt in an oxygen-rich atmosphere at high temperatures, which facilitate the initial oxidation step involving the C–H bond activation on metallic Pt as reflected by in situ diffuse reflectance infrared Fouriertransformed(DRIFT) spectra.Platinum was supported on c-Al_2O_3 and ultrastable Y zeolite(USY) by an incipient wetness impregnation method. The catalysts were characterized by nitrogen physisorption, transmission electron microscopy(TEM),CO/C_3H_8 isothermal oxidations, NH_3 temperature-programmed desorption(NH_3–TPD) and infrared(IR) spectroscopy of adsorbed probe molecules(CO, C_3H_8 and C_3H_8+ O_2). Compared with Pt/Al_2O_3, Pt USY catalyst shows obviously higher activity for the combustion of propane. After estimating the size effect of Pt particles and propane adsorption capacity of USY, the excellent activity of Pt USY is also attributed to the strong interactions between the precious metal and the acidic zeolite. It inhibits the oxidation of Pt in an oxygen-rich atmosphere at high temperatures, which facilitate the initial oxidation step involving the C–H bond activation on metallic Pt as reflected by in situ diffuse reflectance infrared Fouriertransformed(DRIFT) spectra.

关 键 词：PLATINUM ZEOLITE Propane combustion ADSORPTION Metallic state ACIDITY 

分 类 号：O643.36[理学—物理化学]