1998-10-19

Reduction of NOx in Lean Exhaust by Selective NOx-Recirculation (SNR-Technique) Part I: System and Decomposition Process 982592

The SNR-technique is a new NOx aftertreatment system for lean burn gasoline and diesel applications. The objective of SNR is NOx removal from lean exhaust gas by NOx adsorption and subsequent selective external recirculation and decomposition of NOx in the combustion process. The SNR-project is composed of two major parts. Firstly the development of NOx adsorbents which are able to store large quantities of NOx in lean exhaust gas, and secondly the NOx decomposition by the combustion process.
Emphasis of this paper is the investigation of NOx reduction in the combustion process, including experimental investigation and numerical simulation. The NOx decomposition process has been proven in diesel and lean-burn gasoline engines. Depending on the type of engine NOx-conversion rates up to 90 % have been observed. Regarding the complete SNR-system, including the efficiency of the adsorbing material and the NOx decomposition by the combustion, a NOx removal of more than 50% is achievable. By numerical studies the reaction paths of NOx decomposition have been identified As a main result of the reaction analysis it is presumed that the thermal NO production is decreased and additionally the NO reduction via non-thermal NO reactions is increased.
The SNR project was carried out by an international consortium comprising five European countries within the framework of the BRITE EURAM PROGRAMME and with the financial support of the European Community.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

NOx Removal Using Discharge Plasma and Electrophoresis

2003-01-1188

View Details

TECHNICAL PAPER

Emission Control With Lean Mixtures

760226

View Details

TECHNICAL PAPER

Performance and Emissions of an LPG Lean-Burn Engine for Heavy Duty Vehicles

1999-01-1513

View Details

X