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Development of NOx Storage-Reduction Three-way Catalyst for D-4 Engines
Technical Paper
1999-01-1279
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
It is an essential task for automobiles to reduce their fuel consumption. A direct injection gasoline engine (D-4 engine) is effective in reducing fuel consumption, but the reduction of NOx in the lean combustion region is impossible with a conventional three-way catalyst. The NOx storage-reduction three-way catalyst was put into practical use in 1994 for vehicles with lean-burn engines. This catalyst, however, is poisoned by SO2 caused by fuel sulfur, thus its activity is reduced. The conversion efficiency of this sulfur poisoned catalyst was not sufficient for reducing NOx in the exhaust gas of D-4 engine. We have, therefore, studied the mechanism of sulfur poisoning, and succeeded in improving the catalytic performance with the newly developed monolithic substrate and the newly developed additives.
Authors
Citation
Ikeda, Y., Sobue, K., Tsuji, S., and Matsumoto, S., "Development of NOx Storage-Reduction Three-way Catalyst for D-4 Engines," SAE Technical Paper 1999-01-1279, 1999, https://doi.org/10.4271/1999-01-1279.Also In
Gas Direct Injection Aftertreatment and Exhaust Aftertreatment Modeling
Number: SP-1455; Published: 1999-03-01
Number: SP-1455; Published: 1999-03-01
References
- Miyoshi et al. Development of New Concept Three-Way Catalyst for Automotive Lean-Burn Engines SAE Paper 950809 1995
- Kato et al. Development of NOx Storage-Reduction Catalyst System for Automotive Lean-Burn Engines TOYOTA Technical Review 44 2 27 1994
- Suzuki et al. Analysis and Improvement of Poisoning Mechanism of NOx Storage-Reduction Three-Way Catalyst TOYOTA Technical Review 46 2 68 1996