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Development of New Concept Three-Way Catalyst for Automotive Lean-Burn Engines
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English
Abstract
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.
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Authors
- Naoto Miyoshi - Toyota Motor Corp.
- Shin'ichi Matsumoto - Toyota Motor Corp.
- Kenji Katoh - Toyota Motor Corp.
- Toshiaki Tanaka - Toyota Motor Corp.
- Jun Harada - Toyota Motor Corp.
- Naoki Takahashi - Toyota Central R & D Labs., Inc.
- Koji Yokota - Toyota Central R & D Labs., Inc.
- Masahiro Sugiura - Toyota Central R & D Labs., Inc.
- Kouichi Kasahara - Cataler Industrial Co., Ltd.
Topic
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.Also In
Applications and Developments in New Engine Design and Components
Number: SP-1071; Published: 1995-02-01
Number: SP-1071; Published: 1995-02-01
References
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