Browse Publications Technical Papers 2004-01-0156
2004-03-08

Factors Affecting Diesel LNT Durability in Lab Reactor Studies 2004-01-0156

Promising lean NOx trap (LNT) results on lean-burn gasoline engines have encouraged the development of LNTs for diesel applications. Although the fundamentals of LNT are common for both gasoline and diesel applications, there are major differences due to the character of engine operation and control strategies. The sulfur tolerance and thermal durability of current state-of-the-art diesel LNTs under the conditions that represent the thermal and chemical conditions in diesel exhaust were investigated in a laboratory flow reactor.
Sulfur poisoning and thermal aging are unavoidable factors contributing to diesel LNT deactivation. The results show that sensitivity to sulfur poisoning varies with the catalyst formulations, and in some formulations the sulfur poisoning appears reversible. However, the thermal deactivation is permanent regardless of its cause, i.e., LNT de-sulfation (deSOx) or diesel particular filter (DPF) regeneration. The severity of aging depends on gas composition as well as the LNT formulation. The results suggest that there might be several deactivation mechanisms for diesel LNTs that respond differently to aging conditions. This study provides a means to investigate LNT deactivation mechanisms and to estimate durability of LNTs on diesel engine application.

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

Intra-Catalyst Reductant Chemistry and Nox Conversion of Diesel Lean Nox Traps at Various Stages of Sulfur Loading

2006-01-3423

View Details

TECHNICAL PAPER

A New Feedback Control of a Lean Nox Trap Catalyst

2004-01-0527

View Details

TECHNICAL PAPER

New Diesel Emission Control Strategy to Meet US Tier 2 Emissions Regulations

2005-01-1091

View Details

X