RESISTANCE OF MIXED OXIDE CATALYSTS TO SO2-POISONING
复合氧化物汽车尾气净化催化剂抗SO2中毒机理研究

Resistance to SO2 poisoning of mixed oxide catalyst was studied using IR, XPS and TPD techniques. No significant changes was observed after 500 hours exposure to SO2 of 20ppm, and only surface adsorption and a low amount of SO_4~2- were found after exposing to 50ppm SO2 for 20 hours. The special behaviour of the catalyst could be assigned to the function of its additives.