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Study on New Characteristic CeO 2 -ZrO 2 Based Material for Advanced TWC
Technical Paper
2009-01-1078
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Performance improvements resulting from the adoption of a new type CeO2-ZrO2-based material were found using a two-brick three way catalyst (TWC) system. Compared to a conventional CeO2-ZrO2-based material, this new type CeO2-ZrO2 has both a larger oxygen storage capacity and a slower oxygen release rate. Such characteristics were confirmed by fundamental studies. Vehicle evaluations showed this material was most effective for hot NOx control when used in the rear catalyst, especially after fuel cuts. The improvement in NOx was thought to be caused by the increased oxygen storage capacity (OSC), which effectively stored excess oxygen during fuel cuts. As a result, the air-to-fuel ratio (A/F) surrounding the active sites could be kept at stoichiometry even if the engine control shifted to a lean setting.
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Hirasawa, Y., Katoh, K., Yamada, T., and Kohara, A., "Study on New Characteristic CeO2-ZrO2 Based Material for Advanced TWC," SAE Technical Paper 2009-01-1078, 2009, https://doi.org/10.4271/2009-01-1078.Also In
References
- Omoto H, Kobayashi T. Ishikawa K. Yamada T. “Catalyst Design for Meeting Stringent LEV-2 NOx Reduction” SAE Paper 02FL67
- Watanebe, T. Iwachido, K. Tashiro, K JSAE, 20085185
- Yamada, T. Ashizawa H. Nagata, M. “Multiple Regression Analysis of OSC Characteristics Under Transient TWC Conditions” SAE paper 2008-01-0713
- Yamada T. Nagata, M. Modeling of OSC function over Three-way Catalyst” SAE paper 2008-01-1480
- Chang Yun-feng. McCarty Jon G. Catalysis Today 30 1996 163
- Gonzalez-Velasco Juan R. et al Applied Catalysis B 33 2001 303
- Kaspar J. et al Catalysis Today 50 1999 285