【摘要】 使用Pt（NH₃）₂（NO₂）₂作为前驱体,通过过量浸渍法制备Pt/Al₂O₃催化剂,并将其在4种不同的气氛（H₂、O₂、NO或NH₃）中进行焙烧。利用N₂吸脱附、X射线衍射、程序升温还原（H₂-TPR）、CO脉冲吸附、CO原位漫反射傅里叶变换红外光谱（CO in situ DRIFTS）等手段对催化剂的物化性质进行了表征。结果表明:由于还原性焙烧气氛导致了众多小尺寸和高分散的Pt纳米颗粒的生成,经1%（体积分数）H₂/N₂焙烧的Pt/Al₂O₃表现出最佳的CO和C₃H₆催化氧化性能。更多还原

【Abstract】 Pt/Al₂O₃ catalysts were prepared by an excess impregnation method with Pt（NH₃）₂（NO₂）₂ as the precursor. Then they were calcined in four different atmospheres（H₂, O₂, NO, NH₃）, and characterized by N₂ adsorption and desorption test, X-ray diffraction,H₂-temperature programmed reduction（TPR） test, CO pulse adsorption test, and CO in-situ diffuse reflectance infrared Fourier transform spectroscopy（CO in situ DRIFTS）. Results show that Pt/Al₂O₃ catalyst calcined in 1 vol% H₂/N₂ atmosphere exhibits the best catalytic oxidation performance for CO and C₃H₆, because of the generation of numerous small-sized and highly dispersed Pt nanoparticles caused by the reducing calcination atmosphere.更多还原