Treatment of particle filters
A filter, particulate matter technology, used in exhaust treatment, electronic control of exhaust treatment devices, machines/engines, etc.
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Embodiment 1 and 2
[0215] All three SCRF filters were made from the same SiC, 300 / 12, 3.761 substrate type. Each filter was backcoated with the same small pore Cu-exchanged zeolite SCR catalyst with a washcoat loading of 1.93 g / in 3 . The Example 1 and Example 2 filters were loaded with the above-described refractory powder using the standard loading procedure described above under the back pressure used to determine the point to stop spraying the refractory powder. Alu130. The comparative example 1 filter was not loaded with any refractory powder. The following results are obtained:
[0216]
[0217] From the results it can be seen that treating the filter according to the present disclosure yields a significant improvement in the initial filtration efficiency of the filter. In particular, the inventors have found that treatment of filters with a refractory powder having a tap density of less than 0.10 g / l allows a significant improvement in filtration efficiency to be obtained even at...
Embodiment 3 and 4
[0219] All three GPF filters were made from the same cordierite, 300 / 8, 1.261 substrate type. Each filter was backcoated with the same TWC catalyst with a PGM loading of 14.8 g / ft 3 , PGM ratio (Pt:Pd:Rh) is 0:10:1, washcoat loading is 1.1g / in 3 The Example 3 and Example 4 filters were loaded with the silica aerogel described above using the standard loading procedure described above under the back pressure used to determine the point at which spraying of the refractory powder ceased. The comparative example 2 filter was not loaded with any refractory powder. The following results are obtained:
[0220]
[0221]From the results it can be seen that treating the filter according to the present disclosure yields a significant improvement in the initial filtration efficiency of the filter. In particular, the inventors have found that treatment of filters with a refractory powder having a tap density of less than 0.10 g / l allows a significant improvement in filtration efficie...
Embodiment 5
[0223] Both SCRF filters were made from the same SiC, 300 / 12, 3.001 substrate type. Each filter was backcoated with the same small pore Cu-exchanged zeolite SCR catalyst with a washcoat loading of 1.52 g / in 3 . Example 5 Filters were loaded with the AEI zeolite described above using the standard loading procedure described above at the mass of refractory powder used to determine the point at which spraying of the refractory powder ceased. The filter of Comparative Example 3 was not loaded with any refractory powder. The following results are obtained:
[0224]
[0225] As can be seen from the results, the use of a refractory powder with a relatively high tap density of 0.30 g / l (i.e., outside the scope of the present disclosure) in the filter of Example 5 did not achieve the results exhibited by Examples 1 to 4. The same significant increase in filtration efficiency. The inventors have theorized that it is particularly beneficial to use refractory powders with a very lo...
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Abstract
Description
Claims
Application Information
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