Development of a Reformate-Assisted LNT Aftertreatment System for Retrofit to Diesel Engines
| Sub-Grantees: | Electricore, Inc.
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This proposal addresses the need to significantly reduce NOx emissions from diesel powered Class 6-8 trucks, and is extendable to a wide range of off-road equipment, operating in the Houston-Galveston-Brazoria and Dallas-Fort Worth air quality regions. The objective of this proposal is to develop a new NOx reduction system based on the lean NOx trap (LNT) catalyst, assisted by a diesel fuel reformer. This approach for NOx reduction is an attractive alternative to an urea-SCR system, particularly for retrofit, especially where urea infrastructure and compliance issues limit urea-SCR application. Furthermore, the reformate-assisted LNT system operates at temperatures below 225 C, where urea-SCR systems do not, so the proposed approach can maintain high rates of NOx conversion regardless of the engine’s actual, in-use duty-cycle. The diesel fuel reformer is a new technology planned for production in 2010 for OEM applications. The reformer provides a preferred reductant, hydrogen (H2) and carbon monoxide (CO), to the LNT to reduce the stored NOx to nitrogen. The diesel fuel reformer is also used to desulfate the LNT periodically, to remove the sulfur that is stored from the burned fuel and, thereby, maintain high catalyst NOx conversion efficiencies. The H2 in the reformate also lowers the temperature at which sulfur can be removed, thus increasing the durability of the LNT catalyst. The reformer-assisted LNT system is capable of achieving 70% or greater NOx reduction with aged catalysts, without the compliance or duty-cycle issues associated with urea- SCR.
A collaborative effort between Electricore, Inc., Delphi Corporation, Engine Control Systems Limited, and the Southwest Research Institute is planned to develop and demonstrate this new emissions reducing technology, with the follow-on goal of verification for retrofit applications.
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