Exhaust treatment system for dual fuel engines
AssigneeBASF Mobile Emissions Catalysts LLC
InventorsShiang Sung, Pushkaraj R Patwardhan
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Abstract
Disclosed herein are emission treatment systems comprising an oxidation catalyst composition in fluid communication with an exhaust gas stream emitted from an engine that combusts both hydrocarbon fuel and hydrogen; and optionally, at least one selective catalytic reduction (SCR) composition and/or at least one three-way conversion (TWC) catalyst composition, combustion systems comprising the same, and method of treating an exhaust gas stream, such as, e.g., an exhaust gas produced by combusting hydrogen fuel during a cold-start period, using the same.
Claims35
An emission treatment system for treatment of an exhaust gas stream emitted from an engine that combusts both hydrocarbon fuel and hydrogen, comprising:
- a diesel oxidation catalyst composition disposed on a substrate in fluid communication with an exhaust gas stream emitted from an engine that combusts both hydrocarbon fuel and hydrogen;
- at least one selective catalytic reduction (SCR) composition disposed on a substrate downstream from the diesel oxidation catalyst composition;
- and
- at least one three-way conversion (TWC) catalyst composition disposed on a substrate in fluid communication with the exhaust gas stream emitted from the engine that combusts both hydrocarbon fuel and hydrogen,
- wherein the engine is configured to combust hydrogen without combusting hydrocarbon during a cold-start period, and no hydrogen is injected downstream of the engine during the cold-start period.
A combustion system producing a treated exhaust stream, comprising:
- an engine adapted to combust a fuel source comprising a hydrocarbon fuel and a hydrogen fuel, and producing an exhaust gas stream;
- a hydrocarbon fuel source in fluid communication with the engine;
- a hydrogen fuel source in fluid communication with the engine;
- a diesel oxidation catalyst composition disposed on a substrate in fluid communication with the exhaust gas stream emitted from the engine;
- at least one selective catalytic reduction (SCR) composition disposed on a substrate downstream from the diesel oxidation catalyst composition;
- and
- at least one three-way conversion (TWC) catalyst composition disposed on a substrate in fluid communication with the exhaust gas stream emitted from the engine,
- wherein the engine is configured to combust hydrogen without combusting hydrocarbon during a cold-start period, and no hydrogen is injected downstream of the engine during the cold-start period.
A method of treating an exhaust gas stream, the method comprising:
- receiving an exhaust gas stream from an engine adapted to combust both hydrocarbon fuel and hydrogen fuel, wherein the receiving step comprises intermittently receiving an exhaust gas produced by combusting the hydrogen fuel;
- passing the exhaust gas stream through an oxidation catalyst article comprising a diesel oxidation catalyst composition disposed on a substrate in fluid communication with the exhaust gas stream to produce a first effluent;
- receiving the first effluent into a selective catalytic reduction (SCR) article comprising at least one SCR composition disposed on a substrate downstream from the oxidation catalyst article;
- and
- passing the exhaust gas stream through at least one three-way conversion (TWC) catalyst article comprising a three-way conversion catalyst composition disposed on a substrate in fluid communication with an exhaust gas stream;
- wherein the engine is configured to combust hydrogen without combusting hydrocarbon during a cold-start period, and no hydrogen is injected downstream of the engine during the cold-start period.
Dependencies are inferred from the claim text.