Patent ID: 8071037

Claim:
An apparatus for treating exhaust comprising: (a) a housing having an upstream inlet for receiving the exhaust, and a downstream outlet for discharging the exhaust, the housing defining an axial flow path for the exhaust; (b) an injector configured to inject a urea solution into the exhaust; (c) a permeable catalytic device for converting urea to ammonia positioned in the axial flow path downstream of the injector, wherein the catalytic device has an upstream face that is positioned at an angle of about 20-70 degrees relative to the axial flow path and the catalytic device is configured to receive the urea solution from the injector at the upstream face; and (d) a selective catalytic reactor for converting NO x to nitrogen gas and water in the presence of ammonia, wherein the selective catalytic reactor is positioned downstream of the catalytic device; wherein the catalytic device is parallelogram-shaped in cross-section or trapezoid-shaped in cross-section.