What is a ceramic substrate?
Composed of thin-walled extruded ceramic, substrates are used as the bases to hold catalyst coatings. Substrates used for diesel oxidation converters (DOC), three-way catalyst (TWC) and selective catalytic reduction (SCR) catalysts are “flow-through” in structure. This allows gases to pass straight through. Substrates used for diesel particulate filters (DPF) are called “wall-through.” This structure physically traps soot because alternating channels in the substrate are blocked. Substrates can be cylindrical or square and come in many sizes.
