涂层分布形式对汽油机颗粒捕集器催化剂性能的影响

史学刚，张萌萌

潍柴动力股份有限公司，山东 潍坊  261061

摘要：制备GPF-内（涂层在孔道壁内部微孔中）和GPF-外（涂层在孔道壁外部）2种催化剂涂层分布的汽油机颗粒捕集器（gasoline particulate filter，GPF）样品，并辅以不同涂覆工艺，对2种样品的微观涂层分布、冷流/热流背压、积碳-冷流背压、台架起燃温度、储氧量和整车排放性能进行试验对比。试验结果表明：GPF-内的冷流和热流平均背压较GPF-外分别低约17.0%和37.7%；碳载量为2.5 g/L时，GPF-内的积碳-冷流背压较GPF-外低约4 kPa；GPF-内的台架HC、CO和NO_x起燃温度分别较GPF-外低约8.2、6.3和5.9 ℃；GPF-外的粒子数量和颗粒物排放比GPF-内分别低63.82%、10.34%；两者台架储氧量基本相当；GPF-内对降低气态污染物排放及油耗的效果好，GPF-外对颗粒污染物的捕集效率高。

关键词：GPF;涂层分布形式;背压;排放性能

Effect of catalyst coating distribution on the performance of gasoline particle filter catalyst

SHI Xuegang, ZHANG Mengmeng

Weichai Power Co., Ltd., Weifang 261061, China

Abstract：Two types of catalyst coating distribution test samples in the gasoline particulate filter (GPF) of gasoline engines are investigated: GPF inner (coating inside the pore wall) and GPF outer (coating outside the pore wall). The micro coating distribution, cold/hot flow back pressure, carbon deposition cold flow back pressure, bench ignition temperature, oxygen storage capacity, and vehicle emission performance of the two test samples are compared. The experimental results show that the cold and hot flow back pressures of GPF inner are on average about 17.0% and 37.7% lower than those of GPF outer, respectively. When the carbon deposition amount is 2.5 g/L, the carbon deposition cold flow back pressure of GPF inner is about 4 kPa lower than that of GPF outer. The ignition temperatures of HC, CO, and NO_x of GPF inner are approximately 8.2, 6.3, and 5.9 ℃ lower than those of GPF outer , respectively. The emission of particles number and the particulate matter of GPF outer are 63.82% and 10.34% lower than those of GPF inner respectively. The oxygen storage capacity of both platforms is basically equivalent. GPF inner has a good effect on reducing gaseous pollutant emissions and fuel consumption, while GPF outer has a high capture efficiency for particulate pollutants.

Keywords:GPF; catalyst coating distribution; back pressure; emission performance