| abstract |
FILTER ARTICLE, E, SYSTEM FOR THE TREATMENT OF AN EXHAUST GAS A wall flow filter coated with an SCR catalyst composition is provided, in which the catalyst composition contains molecular sieve crystals promoted by transition metal, and in that (i) the crystals have an average crystalline size of about 0.5 pm to about 15 pm, (ii) the crystals are present in said composition as individual crystals, the agglomerations having an average particle size of less than about 15 pm, or a combination of said individual crystals and said agglomerations; and (iii) said molecular sieve is an aluminum silicate or a silica-aluminophosphate of a Frame Type having a maximum ring size of eight tetrahedral atoms. |