| abstract |
FIELD: engines. n SUBSTANCE: invention relates to multifunctional catalyzed filter, which is useful for internal combustion engines exhaust gases cleaning. In particular invention relates to catalyzed filter with flow-through filtration wall, as well as to method of production thereof, which includes following steps: a) providing filter housing with flow-through filtration wall with multiple lengthwise inlet flow channels and discharge flow channels separated by gas-permeable porous partitions; b) applying catalyst porous oxide coating composition containing first catalyst composition, which is active during reaction of nitrogen oxides with carbon oxide and hydrogen with production of ammonia, and second catalyst, which is active during selective recovery of nitrogen oxides by reaction with ammonia with production of nitrogen, wherein first catalyst composition has modal particles size less than porous partitions average pores diameter, and second catalyst composition has modal size of particles greater than porous partitions average pores diameter; c) applying catalyst porous oxide coating on filter housing by adding porous oxide coating through outlet channels outlet end; and d) drying and thermal treatment of filter housing with applied coating in order to obtain catalyzed particulate filter. n EFFECT: purification of internal combustion engines exhaust gases. n 6 cl, 1 ex |