Importance

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Abstract

An apparatus for removing particulate soot from an exhaust gas of an internal combustion engine includes a catalyst and a soot particulate filter positioned downstream of the catalyst for trapping soot particles therein. Atomized fuel is injected into the catalyst. The catalyst has a non-uniform catalytic loading such that the catalyst has an upstream region having a catalytic loading of a first concentration and a downstream region having a catalytic loading of a second concentration. The first concentration is greater than the first. The catalyst catalyzes an exothermic oxidation reaction between the hydrocarbon fuel and oxygen in the exhaust gas. Heat from this exothermic oxidation reaction is transferred to the soot particulate filter thereby igniting the soot particles trapped therein. A method for regenerating a particulate filter assembly having with a catalyst having a non-uniform catalytic coating is also disclosed.

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First Claim