| 摘要 |
Wall-flow filters can be reproducibly provided with a catalytically active coating by providing a defined quantity of a coating composition and sucking this coating composition through the openings of the entry passages into the filter body. The coating composition is sucked in by applying a subatmospheric pressure to the openings of the exit passages of the wall-flow filters. A different ratio of the coating quantities on the inner surfaces (pore surfaces) and outer surfaces (geometric surfaces of the passage walls) forms depending on the type of coating composition-suspension of fine-particle solids, colloidal solution or solution of soluble precursors of catalytically active components. |
