Diesel particulate filter provided with three-way catalytic coatings

Abstract

The invention relates to a diesel particulate filter provided with three-way catalytic coatings, and relates to a diesel particulate filter used for a diesel exhaust system. The diesel particulate filter comprises a plurality of filter flow channels which are used for removing diesel exhaust particulates from diesel exhaust flow, wherein the plurality of filter flow channels are contacted with the diesel exhaust flow and coated with the three-way catalytic coatings; and the three-way catalytic coatings can be configured to promote soot oxidation during occurrence of a regeneration event, and promotes reduction of NOx in the exhaust flow simultaneously. The three-way catalytic coatings can be used as replacement or supplementation of a three-way catalyst of a diesel oxidation catalyst.

Description

Background technique [0001] Diesel engine emissions and their impact on the environment are currently a growing concern. These engines are used in generators, vehicle engines or the like. Along with this concern, there are more and more government regulations to limit the emission of various exhaust gases into the environment. One of the unwanted exhaust gases is NO x . [0002] NO emissions from diesel engines x The amount depends on the air-fuel ratio used to run the engine, as well as other factors such as combustion temperature, the amount of oxygen entering the cylinder, etc. Engines that run only in steady state are typically run with a lean mixture with a high air-to-fuel ratio. Desired torque, fuel economy and manageable NO x Emissions can be achieved through combustion optimization. However, in transient conditions such as vehicle acceleration to achieve the required torque with faster response, the NOx content becomes challenging. In this transient state, sinc...

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Problems solved by technology

But the reduction of EGR leads to NO x increase in emissions

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