SAE 2014 Light Duty Emissions Control Symposium

Technical Session Schedule

Tuesday, December 9

Lean NOx Control
(Session Code: LDD200)

Room Salon ABCD  11:00 a.m.

Moderators - Rahul Mital, General Motors Co.

Time Paper No. Title
11:00 a.m. ORAL ONLY
Reductant Systems
Padmanabha Reddy Ettireddy, Tenneco Inc.
11:25 a.m. ORAL ONLY
Catalyst Technologies for Cold Start Emission Control
Cold start emission control is critical for light duty vehicles to meet the US EPA Tier 3 or CARB LEV III emission standards. Recent development in this area will be reviewed in this presentation. For stoichiometric-burn gasoline engine powdered vehicles, a gasoline Cold Start Concept (gCSC™) technology will be discussed. The technology integrates HC trapping components and low temperature Three-Way Catalysts together to improve the net HC conversion efficiency. For lean-burn diesel engine powered vehicles, novel diesel Cold Start Concept (dCSC™) catalysts will be presented. The catalysts, in combination with NOx reduction catalysts, can significantly reduce the cold start HC/NOx emissions.
Hai-Ying Chen, Johnson Matthey Inc.
11:50 a.m. ORAL ONLY
NOX Control with Passive SCR in Lean Gasoline Engines
The fuel efficiency of a stoichiometric gasoline engine can significantly be improved by operating the engine in a fuel-lean combustion mode. Reduction of oxides of nitrogen (NOX) emissions in lean exhaust, however, poses a significant technical challenge. The passive NH3-SCR system is a potential low-cost approach for controlling nitrogen oxides (NOX) emissions from lean-burn gasoline engines. In this system, NH3 is generated over a close-coupled TWC during periodic slightly rich engine operation and subsequently stored on an under-floor SCR catalyst. Upon switching to lean, NOX passes through the TWC and is reduced by the stored NH3 on the SCR catalyst. This presentation discusses reductant generation and utilization processes over the passive SCR system and analysis relevant to simulated drive cycles where lean, rich and stoichiometric operations are used to meet engine torque and catalyst emission control demands.
Vitaly Prikhodko, James E. Parks, Josh Pihl, Todd Toops, Oak Ridge National Laboratory
12:15 p.m. Panel
Panel Discussion