| 摘要 |
A catalysed wallflow filter substrate monolith to which the manufacturer of the wallflow filter substrate monolith has pre-coated to inlet channels thereof a surface membrane layer comprising finely divided refractory solids , wherein the outlet channels comprise an axially substantially uniform coating profile of catalyst washcoat, wherein the washcoat loading in an axially upstream half of the catalysed wallflow filter substrate monolith is with 10% of the washcoat loading in the axially downstream half thereof. |
