Topic: Deposits in SDPF systems and their disposal options
Project duration: 2017/2018
Project status: completed
The consistent updating of emissions legislation requires continuous further development of exhaust gas aftertreatment technologies. In particular, the low-temperature functionality of SCR catalysts is a challenge. The integration of the SCR coating on the DPF substrate enables a connection close to the engine, which positively favors the SCR functionality due to the higher exhaust gas temperatures. The DPF’s SCR coating entails additional deposits in the exhaust gas aftertreatment system. In addition to soot, engine oil and fuel ashes, insoluble AdBlue® components and urea secondary products are also stored. The extent and possible interactions of the different deposit components on the catalytic coating are largely unknown. With regard to the required durability of the exhaust gas aftertreatment systems (in-use conformity, e.g. commercial vehicle 700,000 km), questions arise with regard to the formation of deposits and their disposal options, which will be of increasing importance in the practical use with SDPF systems in the future.
The aim of this literature study was to obtain a comprehensive overview of SDPF systems, the ash deposition / education mechanisms and their disposal options.