Patent ID: 9140167
Filing Date: 2015-09-22
Classification: B01D,B01J,F01N,F02D

Abstract:
1. An apparatus comprising a lean-burn internal combustion engine, engine management means and an exhaust system for treating exhaust gas of the engine, which exhaust system comprising a first oxidation catalyst disposed on a first honeycomb monolith substrate, which first oxidation catalyst comprising platinum supported on a first metal oxide support comprising at least one reducible oxide and at least one molecular sieve, wherein the at least one molecular sieve comprises at least one precious metal and either (i) copper, (ii) iron, or (iii) copper and iron, wherein the first oxidation catalyst is substantially free of alkali metals and alkaline earth metals, wherein the engine management means is arranged, when in use, intermittently to modulate the lambda composition of the exhaust gas contacting the first oxidation catalyst to a rich lambda composition.