US 9,808,763 B2
Catalyst system for lean NOx reduction with hydrocarbons
David Ginter, Commerce Township, MI (US); Ling Deng, Dunlap, IL (US); Paul Park, Peoria, IL (US); and Scott B. Fiveland, Metamora, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Dec. 8, 2015, as Appl. No. 14/962,385.
Prior Publication US 2017/0157563 A1, Jun. 8, 2017
Int. Cl. B01D 53/94 (2006.01)
CPC B01D 53/9418 (2013.01) [B01D 53/9431 (2013.01); B01D 53/9459 (2013.01); B01D 53/9495 (2013.01); B01D 2251/21 (2013.01); B01D 2255/904 (2013.01)] 9 Claims
OG exemplary drawing
1. 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.