Study on New Characteristic CeO 2 -ZrO 2 Based Material for Advanced TWC

2009-01-1078

04/20/2009

Event
SAE World Congress & Exhibition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-1078
Pages
5
Citation
Hirasawa, Y., Katoh, K., Yamada, T., and Kohara, A., "Study on New Characteristic CeO 2 -ZrO 2 Based Material for Advanced TWC," SAE Technical Paper 2009-01-1078, 2009, https://doi.org/10.4271/2009-01-1078.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-1078
Content Type
Technical Paper
Language
English