Sulfur-Resistant Exhaust Gas Aftertreatment System For The Oxidation Of NO
AssigneeMAN Nutzfahrzeuge AG
InventorAndreas Doring
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Abstract
An arrangement for aftertreatment of exhaust gas for lean-burn internal combustion engines such as diesel engines and Otto engines with direct injection includes a catalyzer for oxidation of nitrogen monoxide and a molecular sieve which keeps sulfur dioxide away from the catalyzer arranged upstream of the catalyzer.
Claims26
Apparatus for after-treatment exhaust gas in the exhaust gas line of a lean-burn internal combustion engine, the exhaust gas line having an input and an output, the apparatus comprising:
- a catalyzer having at least one active component for oxidation of nitrogen monoxide;
- and
- a molecular sieve arranged upstream of the catalyzer, the molecular sieve preventing sulfur dioxide from reaching the catalyzer.
A method for producing an apparatus for after-treatment exhaust gas in the exhaust gas line of a lean-burn internal combustion engine, the method comprising:
- producing a catalyzer having at least one active component for oxidation of nitrogen monoxide by one of extrusion and coating a substrate;
- and
- providing a molecular sieve layer on the catalyzer, the molecular sieve layer preventing sulfur dioxide from reaching the catalyzer.
The method of claim 24 further comprising arranging a catalytic layer on the molecular sieve layer, the catalytic layer having at least one active component for oxidation of hydrocarbons.
Dependencies are inferred from the claim text.