以高比表面积三元复合氧化物作为载体制备Pt/CeO2-TiO2-Al2O3催化剂,调控贵金属Pt负载过程中的p H,研究催化剂体系在NO气氛下对碳烟的消除能力。结果表明催化剂合成过程中的p H值越低,催化剂中贵金属粒子越大、同时催化剂中化学吸附的表面活性氧物种(O2-,O-)的量越多,催化剂对碳烟的消除能力越强。原位傅立叶红外表征证明双齿硝酸盐和吸附NO2是反应所需活性中间物种,优化制备的催化剂P3具有优异的抗H2O及抗SO2中毒的性能。 The Pt / CeO2-TiO2-Al2O3 catalyst was prepared by using ternary composite oxides with high specific surface area to control the p H during the Pt loading process. The removal of soot by the catalyst system under NO atmosphere was studied. The results show that the lower the value of p H in the catalyst synthesis, the larger the noble metal particles in the catalyst, and the more the amount of chemically adsorbed surface active oxygen species (O2-, O-) in the catalyst, the more the catalyst can eliminate the soot Strong. In-situ Fourier transform infrared spectroscopy (FT-IR) showed that bidentate nitrate and NO2 were the active intermediates for the reaction. The optimized catalyst P3 possesses excellent resistance to H2O2 and SO2 poisoning.