【摘要】 采用不同孔密度载体分别负载不同贵金属含量、不同涂层涂敷量制备系列三效催化剂,通过模拟计算和发动机台架试验研究了具有不同孔结构载体的催化剂性能。结果表明,提高载体孔密度可明显改善催化剂的起燃特性和空燃比特性、有效降低催化剂中贵金属用量、提高HCs转化效率。起燃温度变化取决于孔密度和贵金属含量间的协同作用;载体孔密度变化对催化剂空燃比特性产生的影响更强于贵金属含量变化;经高温老化后,贵金属量仍是保持催化剂转化效率稳定性的重要因素。更多还原

【Abstract】 A series of three-way catalysts was prepared by different cell density substrates with different precious metal contents and washcoat loading.Light-off characteristics of the catalysts were studied by analog computation and tested on engine bench.The results indicate that high cell density of the substrate can improve the catalyst light-off characteristics and air-fuel ratio characteristics markedly,decrease precious metals content in the catalyst and enhance the capability of purifying HCs.The light-off temperature is dependent on the synergic relationship between the substrate cell density and precious metals content.The influence of substrate cell density on air-fuel ratio characteristics is stronger than that of precious metals content.For the aged catalyst,the precious metals content is still an important factor for maintaining catalytic conversion.更多还原