| 摘要 |
<p>The catalytically active particulate filter comprises a wall-flow filter substrate (3), as a filter body, defined by porous walls to separate inflow (4) and outflow (5) channels, where downstream ends of the inflow channels (4) and the upstream ends of the outlet channels are sealed by a gas-tight (6), and two catalytically active coatings, where a first catalytically active coating contains platinum and palladium and is located in the porous walls between the outflow channels, and a second catalytically active coating (2) contains platinum and palladium in the outflow channels. The catalytically active particulate filter comprises a wall-flow filter substrate (3), as a filter body, defined by porous walls to separate inflow (4) and outflow (5) channels, where downstream ends of the inflow channels (4) and the upstream ends of the outlet channels are sealed by a gas-tight (6), and two catalytically active coatings, where a first catalytically active coating contains platinum and palladium and is located in the porous walls between the outflow channels, a second catalytically active coating (2) contains platinum and palladium in the outflow channels on the porous walls between inflow and outflow channels, and a platinum content of the second catalytically active coating is higher than a platinum content of the first catalytically active coating. A weight ratio of platinum to palladium in the first catalytically active coating is 1:4-2:1. The first and second catalytically active coatings extend over the entire length of the wall flow filter substrate. A weight-ratio of platinum to palladium the second catalytically active coating is 6:1. The filter body includes ceramic material. Independent claims are included for: (1) a method for reducing particulate, hydrocarbons and carbon monoxide in diesel engine exhaust gases; and (2) an exhaust gas purification system.</p> |
