Ceramic Wall-Flow Filters And Oxidation Catalyst Supports For Diesel Exhaust Aftertreatment

Extruded cordierite honeycombs have proven successful as filters for trapping and incineration of soot carbon, and as catalyst supports for the oxidation of CO and HC emissions in diesel exhaust. The microstructure, properties and design of an extruded cordierite ceramic filter with a 100/17 square cell structure, which help meet performance and durability requirements, are presented. The importance of systems approach to filter design is illustrated by an example where the appropriate choice of filter composition, packaging design, soot loading and regeneration technique helps meet performance and durability requirements.