- Substrate & filter technologies
Silicon Carbide diesel particulate filter
The primary function of a DPF is to trap and reduce particulate matter mass (PM) in the diesel exhaust by > 95 % and the particulate number (PN) by > 99 % at the cost of minimal possible back pressure and should be able to sustain high thermal loads.
Dinex Silicon Carbide DPF (SiC-DPF) is a robust substrate technology with moderate back pressure under high soot and ash loads. It is available at a porosity level of 52% for catalysed DPF applications and at a high porosity level up to 65% to accommodate high wash coat loadings, typical of SCR-DPF applications. The coated filters feature a thin but powerful coating designed to work under passive as well as active regeneration strategies.
The high porous Silicon Carbide is based on a reaction forming process of silicon and carbon in-situ to SiC. The final porous structure is built up by hexagonal plate like crystals, which build a three-dimensional network with a high pore volume.
The substrates feature a grooved lock mechanism that provides the necessary mechanical resistance while improving flow dynamics. Made with high quality stainless steel, they are lightweight and easy to integrate into the exhaust system. The use of thin foils allows fast heating and an improvement in turn mass transfer rates while maintaining a low backpressure.
For applications where high temperatures are expected - like CNG/LNG ATS systems, brazing of the substrates is done to add additional mechanical durability.
Substrates are available in cell densities 120, 200, 350 and 500 cpsi.
Metallic filters (POC)
The primary function of a metallic filter based primary oxidation catalyst (POC) is to reduce the particulate matter mass (PM) by at least 40 – 50% and find application in some older generation emissions regulations like EU IV and some current and upcoming off-road regulations in developing countries like India.
Dinex POC ® is an open filter substrate, developed to trap particulate matter in light-duty and heavy-duty diesel vehicles and have special X layer structure. The substrates are characterised by having high mechanical durability, excellent flow distribution and maintenance free flow through construction. Coated with specific wash coat, they are made of a 100 % stainless steel structure.
The substrates are available in 330 cpsi configuration with standard length of 152 mm.