GPF (Gasoline Particulate Filter)Euro 6 PN Filtration for After-treatment System

GPF (Gasoline Particulate Filter)

Gasoline particulate filters (GPF) are an emission aftertreatment technology based on diesel particulate filters (DPF), developed to control particulate emissions from gasoline direct injection (GDI) engines. The technology is also referred to as petrol particulate filter (PPF) and, in some German literature, as Otto particle filter (Ottopartikelfilter in German), abbreviated OPF.

The population of GDI vehicles has been increasing, driven by CO2 and/or fuel economy requirements. In 2016, an estimated 2/3 of new gasoline cars in Europe were GDI [JM 2017]. The proportion of GDI vehicles has been also rapidly increasing in North America—within nine years after its first significant use in the market, GDI penetration has climbed to 48.5% of new light vehicle sales in the United States [Davis 2017]. Emissions from the growing GDI vehicle fleet are a public health concern and a potential major source of ambient particle pollution in highly populated urban areas.

To meet Euro 6 / China-VI stage light-duty vehicles PN emission requirements, WFEC developed WFG series cGPF catalysts. WFEC cGPF catalysts can achieve excellent PN filtration rate through optimized washcoat design and distribution. By improve of washcoat material and coating process, the backpressure of cGPF catalyst is largely decreased, thus the negative influence on engine fuel economy by cGPF is obvious lowered. And the active catalytic washcoat on cGPF can deeply purify gas pollutant (such as THC, CO and NO_x) and fulfill Euro 6 / China-VI aging requirements. cGPF can install in CC (Close-coupled) or UF (Under-floor) position, applying together with TWC. The vehicle emission of PN and gas pollutant is able to completely satisfy Euro 6 / China-VI regulations after employing WFEC TWC+cGPF aftertreatment system.