催化剂中贵金属与汽车排放关系的研究

A Study on the Correlation Between the Precious Metal in Catalysts and Vehicle Emission

对451辆国5轻型汽油耐久封样车辆的贵金属进行统计分析,比较部分车辆排放数据与贵金属关系。结果表明:目前国5轻型汽油车催化器多采用4种形式的载体单元分布模式,催化剂多采用Pd/Rh贵金属组合形式,贵金属总含量为5~162 g/ft^3,使用Pd/Rh贵金属比例多在6:1至16:1的区间范围内。适当的贵金属含量和比例可以更有效的降低尾气排放。

The precious metals of 451 gasoline vehicles which finished the durable tests and followed the national emission standards V were analyzed, and the correlation between the emission data of some vehicles and precious metals was compared. The results showed that： so far the catalytic converters of gasoline vehicle followed the national emission standards V used four forms of carrier unit distribution pattern. The combination of Pd/Rh were used frequently. The total content of precious metals were 5-162 g/ft3. Pd/Rh proportion were 6：1 to 16：1. Appropriate precious metal content and proportion could be more effective to reduce emissions.