What is a Gasoline Particulate Filter (GPF) ?
What is a Gasoline Particulate Filter (GPF)?
Gasoline particulate filters (GPF) are based on the proven wall-flow technology of diesel particulate filters. While the purpose of DPF is to mitigate particulate emissions from diesel engines, GPFs were developed to reduce fine particulate emissions from gasoline vehicles.
GPFs have the same honeycomb structure as DPFs, but are exclusively made with a ceramic cordierite material with a wall microstructure specifically engineered for gasoline exhaust. The porosity of this material can be higher than in a DPF to allow for the filtration of finer particulates (PM2.5 or smaller) prevalent in gasoline vehicle exhaust. There are also some differences in the filter configurations within the system design. These filters can withstand high temperatures >1100°C (2000°F), are extremely thermal shock resistant to allow for rapid heat-up on frigid days.
Since their introduction, advanced gasoline engines like high-performance gasoline-direct-injection (GDI) engines dominate engine design. They offer consumers better fuel economy without sacrificing engine performance. However, they produce a high number of fine particulates, such as PM2.5, that impact air quality and human health. As a result, Europe (with the introduction of EU6 regulations) and China (with China 6 regulations) introduced a particle limit for gasoline exhaust.
Leveraging particulate filters in gasoline systems is an important engineering advancement for clean-vehicle technology and the designs keep improving. Corning’s latest generation of GPFs offer filtration efficiency of more than 95% of particulates from vehicle exhaust when filters are new. Filters improve with age and increase their collection efficiency as mileage accumulates. In some cities, that means exhaust can actually be cleaner than the ambient air’s particulate level.
Corning offers two families of products for the different requirements of each application: DuraTrap® GC filters for uncatalyzed applications and DuraTrap® GC HP filters for catalyzed applications.