Filter for exhaust gas cleaning and method for manufacturing same
A technology for exhaust gas purification and manufacturing methods, applied in chemical instruments and methods, membrane filters, separation methods, etc., can solve problems such as increased manufacturing costs, catalyst loading, and complicated processes, and achieve stable production and supply, and high PM purification rate , the effect of simple process
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[0088] 2. Catalyst preparation method
[0089] The manufacturing method of the exhaust gas purification filter of this embodiment is the manufacturing method of the exhaust gas purification filter 1 (CSF) which at least includes the honeycomb substrate 1 and the catalyst, and the honeycomb The honeycomb base material 1 has a porous partition wall 3 that traps particulate components such as soot in the exhaust gas, and the catalyst is supported on the aforementioned honeycomb base material 1 and will be captured by the aforementioned partition walls 3 of the aforementioned honeycomb base material 1 And the aforementioned particulate components accumulated in the unit are burned and removed, and the manufacturing method has the following steps:
[0090] The catalyst slurrying process is a catalyst slurrying process in which the catalyst 2 is slurried to prepare the catalyst slurry 4, and includes any one of the following x) to z) mixing and crushing treatment;
[0091] a cataly...
Embodiment 1
[0156] (catalyst preparation)
[0157] 100 parts by mass of raw material powders containing cerium oxide, zirconia, lanthanum oxide, and yttrium oxide in a mass ratio of 37:46:5:5 were placed in chloroplatinic acid as a Pt raw material component and as a Pd raw material component. 50 parts by mass of an aqueous solution of palladium nitrate (the mass ratio of Pt and Pd is 5:2) was mixed in a liquid tank, the precious metal component was impregnated on the aforementioned inorganic oxide, and fired at 600° C. for 30 minutes to obtain A catalyst (catalyst powder) in which a noble metal component is supported on an inorganic oxide having the composition described in .
[0158] To 100 parts by mass of the obtained catalyst powder, 300 parts by mass of water was added and mixed to slurry the catalyst powder. Thereafter, the obtained catalyst slurry was put into a ball mill (manufactured by Makino Corporation, trade name: BM40L), and the conditions were adjusted so that the particle...
Embodiment 2
[0167]In Example 1, the conditions for catalyst pulverization were changed. That is, the treatment time of the pulverization treatment was changed to 60 minutes so that the particle diameter (D90) was in the range of 0.5A1 μm to 0.67A1 μm relative to the average pore diameter A1 μm of the partition wall, and the same operation as in Example 1 was carried out. , to obtain catalyst slurry. When the particle size (D90) of the catalyst powder in the obtained catalyst slurry was measured in the same manner as in Example 1, it was confirmed that it was 0.65 times the average pore size A1 μm of the partition wall. That is, the catalyst slurry of Example 2 containing the catalyst powder with a particle diameter (D90) of 0.65A1 μm was obtained. In Table 1, the numerical values of (particle diameter (D90) / average pore diameter of partition wall) and (particle diameter (D50) / average pore diameter of partition wall) are shown, respectively.
[0168] Next, except having used the cataly...
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