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AssigneeJohnson Mattey Public Limited Company
InventorsDavid Bergeal, Andrew Francis Chiffey, Marie Feuersein, Paul Richard Phillips, Wolfgang Strehlau, Daniel Swallow, James Wylie
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An apparatus is disclosed. The apparatus comprises a lean-burn internal combustion engine, engine management means and an exhaust system for treating exhaust gas of the engine. The exhaust system comprises a first oxidation catalyst disposed on a first honeycomb monolith substrate. The first oxidation catalyst comprises platinum supported on a first metal oxide support comprising at least one reducible oxide, and is substantially free of alkali metals and alkaline earth metals. The engine management means is arranged, when in use, intermittently to modulate the lambda composition of the exhaust gas entering the first oxidation catalyst to a rich lambda composition.
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, 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.
A method of recovering an oxidation activity of a first oxidation catalyst aged in an exhaust gas of a lean-burn internal combustion engine, which first oxidation catalyst comprising platinum supported on a first metal oxide support and disposed on a honeycomb monolith substrate, which method comprising the step of intermittently contacting the first oxidation catalyst with exhaust gas modulated to a rich lambda composition, wherein the first metal oxide support comprises at least one reducible oxide and wherein the first oxidation catalyst is substantially free of alkali metals and alkaline earth metals.
Dependencies are inferred from the claim text.