Improved catalytic soot filter
A filter and soot technology, applied in the direction of dispersed particle filtration, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of system volume increase limitation, cost increase, and the need for reducing agents, etc.
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[0102] 1. Catalyst preparation
[0103] 1.1 Zoned Catalytic Soot Filter with Pd-Rear Outlet Coating - 50% Length (Sample A)
[0104] For inlet coating, use to provide 13g / ft 3 The final dry Pd content of palladium nitrate aqueous impregnated 0.25g / in 3 The gamma-alumina is then impregnated with a platinum solution of a Pt complex in which platinum is stabilized as an ammine to provide 27 g / ft 3 of dry Pt content. The resulting powder was dispersed in water. The resulting slurry was then used to coat a cordierite filter substrate from the inlet side of the filter to 50% of the full length of the filter. After drying at 110°C in air and calcination in air at 450°C, the amount of washcoat on 50% of the inlet to the filter substrate was approximately 0.27g / in 3 .
[0105] For outlet coating, use to provide 5g / ft 3 The final dry Pd content of palladium nitrate aqueous impregnated 0.25g / in 3 gamma-alumina. The resulting powder was dispersed in water. The resulting slurry w...
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