| Abstract: | Catalysts that were recently developed by Toyota for the control of automobile exhaust are reviewed. (1) A system combining a close-coupled catalyst with high heat resistance and an under-floor catalyst with high oxygen storage capacity were developed for low emission vehicles. (2) Based on a new concept, a three-way catalyst having the ability to store NOx at oxidizing atmosphere and to reduce stored NOx at stoichiometric or reducing atmosphere was developed for automotive lean burn engines. (3) A thin wall ceramic substrate was developed for better catalyst performance. |
