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US 9,808,763 B2Granted
Catalyst system for lean NOx reduction with hydrocarbons
AssigneeCaterpillar Inc.
InventorsDavid Ginter, Ling Deng, Paul Park, Scott B. Fiveland
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Abstract
A NOx control system includes a lean NOx catalyst and an alcohol generator. The lean NOx catalyst includes a substrate and a hydrocarbon selective catalytic reduction (HC-SCR) catalyst disposed on the substrate. The HC-SCR catalyst catalyzes a reduction of NOx with an alcohol. The alcohol generator generates the alcohol.
Claims9
A NOx control system to selectively reduce NOx present in an exhaust, the NOx control system comprising:
- a lean NOx catalyst including:
- a substrate;
- and
- a hydrocarbon selective catalytic reduction (HC-SCR) catalyst disposed on the substrate, wherein the HC-SCR catalyst catalyzes a reduction of NOx with an alcohol;
- and
- an alcohol generator to generate the alcohol;
- wherein the alcohol generator is a superacid catalyst disposed on the substrate and the superacid catalyst catalyzes a reaction to convert an exhaust constituent into the alcohol.
4 more elements
Dependencies are inferred from the claim text.