Wall-flow filter comprising catalytic washcoat
A technology of wall-flow filter and catalytic carrier, applied in the direction of catalyst carrier, dispersed particle filtration, molecular sieve catalyst, etc., to achieve the effect of reducing resource usage and improving process steps
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0124] A Cu-aluminosilicate zeolite selective catalytic reduction (SCR) catalyst was prepared by grinding a prefabricated sample to a volume D90 ≤ 5 μm. Two washcoat samples were prepared using SCR catalyst samples and deionized water. The first sample was a low viscosity sample adjusted to 36% w / w solids containing 10% w / w binder. The second sample was a high viscosity sample adjusted to 43% w / w solids containing 10% w / w binder. Neither the relatively high viscosity sample nor the relatively low viscosity sample included any surfactants or rheology modifiers. However, the viscosity of both samples was 10-40 cp as measured on a Brookfield viscometer at 50 rpm using spindle number 1.
[0125] The lower end of an uncoated asymmetric relatively high porosity (approximately 60% porosity) aluminum titanate filter substrate (including end plugs at each end in a "normal" wall-flow filter configuration) of an asymmetric square structure (with vertically extending channels) dipped i...
Embodiment 2
[0129] A new washcoat sample used the same Cu-aluminosilicate zeolite SCR catalyst as described in Example 1, deionized water, 10% w / w solids binder (total 35% solids w / w) and Prepared with 0.2% by weight of commercially available hydroxymethylcellulose as a rheology modifier. The viscosity of the new washcoat sample was 2000 cp as measured on a Brookfield viscometer at 50 rpm, spindle number 3. This new washcoat sample was coated to the relatively high porosity (about 60 % porosity), uncoated aluminum titanate filter substrate, the method comprising the steps of: (a) placing the containment device on the monolithic filter substrate, (b) metering a predetermined amount of the liquid component to the containment device, in the order of (a) followed by (b); and (c) by applying a vacuum, the liquid component is drawn into at least a portion of the substrate, and substantially all of the amount is maintained in the base. The resulting coated product is dried and then calcined. ...
Embodiment 3
[0132] The 35% w / w solids sample of Example 2 was used, but without the rheology modifier, to coat the same relatively high porosity aluminum titanate filter substrate as used in Example 2, but instead using WO2011 / 080525 The disclosed method and apparatus, comprising the steps of: (i) holding the honeycomb monolithic substrate substantially vertical; (ii) introducing a predetermined volume of liquid into the substrate via the open ends of channels at the lower end of the substrate; (iii) placing The introduced liquid is retained sealed within the substrate; (iv) inverting the substrate containing the retained liquid; and (v) applying a vacuum to the open ends of the substrate channels at the lower end of the inverted substrate to draw air along the channels of the substrate. into the liquid. In this example, the washcoat is introduced into the open channels at the first end of the filter, followed by drying, followed by a calcination step. Next, the product of this first "pa...
PUM
| Property | Measurement | Unit |
|---|---|---|
| size | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
| size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More