トヨタ自動車株式会社第1材料技術部触媒設計室Catalyst Desigen Department, Material Engineering Division 1, Toyota Motor Corporation ◇ Toyota-cho 1, Toyota-shi, Aichi 471-71, Japan
トヨタにおいて最近開発された自動車排ガス触媒について概説する。（1）触媒浄化特性を高める薄壁基材。（2）低エミッション車用に開発した耐熱性の高いスタートアップ触媒と酸素貯蔵能力の高い床下触媒との組み合わせシステム。（3）新しいコンセプトに基づいてリーンバーンエンジン用に開発した酸化雰囲気で窒素酸化物を吸蔵し，還元雰囲気で還元する機能を持つ触媒。（4）ディーゼルエンジン用に開発した低温活性の高い触媒。
Catalysts that were recently developed by Toyota for automobile exhaust are reviewed. (1) A thin wall substrates were developed for better catalyst performance. (2) A system combining a close-coupled catalyst with high heat resistance and an under-floor catalyst with high oxygen capacity were developed for low emission vehicles. (3) Based on a new concept, a three-way catalyst having the ability to store NOx at oxidizing atmosphere and to reduce stored NOx at reducing atmosphere was developed for automotive lean burn engines. (4) An oxidizing catalyst with low light off temperature was developed for automotive diesel engines.
Key words: Automobile catalyst; Thin wall substrate; Close-coupled catalyst; Oxygen storage capacity; Low emission vehicle; NOx storage-reduction catalyst; Diesel oxidizing catalyst
© 1998 ゼオライト学会© 1998 Japan Association of Zeolite
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