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Technical selection guidance for gasoline three-way catalysts (TWC), diesel oxidation catalysts (DOC), particulate filters (DPF) and selective catalytic reduction (SCR) systems.
Near the stoichiometric air-fuel ratio, a TWC simultaneously oxidizes carbon monoxide (CO) and hydrocarbons (HC) while reducing nitrogen oxides (NOₓ). Engineering selection must consider precious-metal formulation, oxygen-storage materials, substrate CPSI, washcoat loading, light-off temperature, back pressure and durability duty.
Selection requires more than package dimensions: reaction chemistry, exhaust conditions, substrate structure and durability targets must be evaluated together.
CO and HC oxidation and NOₓ reduction must operate together within the required temperature and air-fuel-ratio window.
Match ceramic or metallic substrate, CPSI and washcoat loading to flow, back-pressure, thermal-load and lifetime targets.
Evaluate light-off, thermal shock, ageing, sulfur or phosphorus poisoning and high-temperature stability.
Use engine displacement, exhaust flow, sensor layout, emission standard and installation space for engineering selection.
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