Search Results

In recent years, emission regulations have become stricter as part of the shift toward decarbonization. Particularly in Europe, the PN (Particulate Number) regulation has grown stricter, and further enhancement of PN filtration efficiency of GPF (Gasoline Particulate Filter) is required. However, as PN filtration efficiency is enhanced, pressure drop increases. There is a trade-off between PN filtration efficiency and pressure drop. In particular, coated GPF (cGPF) tends to deteriorate this trade-off relationship compared to uncoated GPF because of the coating of the catalyst. On the other hand, cGPFs have three-way performance, which can reduce the number of catalyst converters in the exhaust system. Therefore, we tried to establish a high performance cGPF by enhancing the trade-off relationship between PN filtration efficiency and pressure drop.