贵金属分布设计对单级双载催化器性能的影响

Influences of Precious Metals Distribution Design on the Performances of the Converter with Two substrates

摘要:

面对单级双载催化器的应用需求，研究了贵金属Pd、Rh在两块载体上的分布对催化器活性和抗老化性的影响。结果表明，Pd、Rh在两块载体上的分布对催化器的催化活性和抗老化性均造成显著影响；对于不同催化器，高Pd比例催化剂同处进气端或排气端时，Pd比例越高越有利于提高催化活性和抗老化性；对同一套催化器，高Pd催化剂在进气端时性能优于在排气端时；而负载相同Pd、Rh比例的催化剂组合未表现出明显的性能优势。说明在单级双载催化系统中对两块催化剂上的贵金属进行合理地分布设计对更有效地控制尾气排放和提高使用寿命是非常重要的

Abstract:

The converters with two catalysts in every one were prepared and their catalytic activity and anti-aging ability were studied with the distribution changes of palladium and rhodium contents on the two substrates. The results show that the two metals distribution influences the converter activity and anti-aging ability significantly, and for the different converters, a higher content of Palladium in the catalysts all near to the inlet or the outlet is more helpful to enhance the converter catalytic activity and anti-aging ability. For the same converter, the performances were higher when the catalyst loading more Palladium is near to the inlet, but without obvious performance advantage for the converter with same Pd/Rh ratio on the two substrates. It is indicated that designing a precious metals distribution reasonably on the two substrates is very important for increasing the using life of single converter with two substrates and controlling the vehicle exhaust emission effectively