Gasoline particulate filter

Filtration efficiency rises with aging

In aged aftertreatment systems, the ash layer established in the GPF improves filtration efficiency, yielding better overall particle removal than with fresh components.

Wang, Xin · Wang, Chongyao · Yang, Nan · Ge, Zihao · Chen, Dong · Liangxiao, Hou · Lyu, Liqun · Tan, Jianwei · Hao, Lijun · Ge, Yunshan

Journal of Hazardous Materials 2026

Specifications

Peak particle diameter

{'zh': '90', 'en': '90'} nm

Advantages

Filtration improves with aging

The establishment of an ash layer increases the filtration efficiency of the GPF, thereby improving the overall PN removal efficiency of the aged aftertreatment system.

Further reductions via strategy

With the aged aftertreatment system, optimizing the fuel enrichment strategy during engine warm-starts can further reduce PN emissions.

Aged catalyst retains efficiency

Although aging reduced the oxidation efficiency, the increased GPF filtration efficiency compensated, resulting in improved overall removal efficiency.

Applications

• HEV particulate emission control：Validate aftertreatment performance for HEV start-stop particulate control.
• Exhaust aftertreatment：Compare fresh and aged GPF filtration efficiency under real driving.
• Particulate emission testing：Characterize particulate emissions during cold/warm starts via RDE and RTS95.
• Catalytic filter materials：Assess ash layer impact on catalytic filter filtration and oxidation.