Development of New Concept Three-Way Catalyst for Automotive Lean-Burn Engines 950809
A new 3-way catalyst with NOx conversion performance for lean-burn engines has been developed. The catalyst oxidizes NOx and stores the resulting nitrate, which is then reduced by HC and CO during engine operation around the stoichiometric air/fuel ratio. Both the composition of the storage component and the particle sizes of the noble metal were optimized. In addition, a special air fuel mixture control has been developed to make the best of the NOx storage-reduction function. The present catalyst showed 90% conversion efficiency and improved fuel economy by 4% in the Japanese 10-15 mode test cycle. The efficiency remained at 60% or more after durability test.
Citation: Miyoshi, N., Matsumoto, S., Katoh, K., Tanaka, T. et al., "Development of New Concept Three-Way Catalyst for Automotive Lean-Burn Engines," SAE Technical Paper 950809, 1995, https://doi.org/10.4271/950809. Download Citation
Author(s):
Naoto Miyoshi, Shin'ichi Matsumoto, Kenji Katoh, Toshiaki Tanaka, Jun Harada, Naoki Takahashi, Koji Yokota, Masahiro Sugiura, Kouichi Kasahara
Affiliated:
Toyota Motor Corp., Toyota Central R & D Labs., Inc., Cataler Industrial Co., Ltd.
Pages: 12
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Applications and Developments in New Engine Design and Components-SP-1071, SAE 1995 Transactions: Journal of Engines-V104-3
Related Topics:
Three-way catalysts
Fuel economy
Catalysts
Lean burn engines
Energy conservation
Particulate matter (PM)
Storage
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