Influence of Oxygen Storage Characteristics on Automobile Emissions

Paper #:
  • 1999-01-1076

Published:
  • 1999-03-01
Citation:
Tan, I., Yamamoto, M., Yamada, K., and Tanaka, H., "Influence of Oxygen Storage Characteristics on Automobile Emissions," SAE Technical Paper 1999-01-1076, 1999, https://doi.org/10.4271/1999-01-1076.
Pages:
10
Abstract:
The catalytic performance and On-Board Diagnostics (OBD) of the manifold catalyst having high Oxygen Storage Capacity (OSC) are described in this paper.First of all, we compared the performance of three-way catalysts containing Cerium - Zirconium - Yttrium oxide with Cerium - Zirconium oxide. Three-way catalysts dispersed Pt, Rh and Pd on Cerium - Zirconium - Yttrium oxide showed excellent catalytic performance especially at cold starting and at transient states, after high temperature aging at 1050°C. The performance of these catalysts was studied using the Driving Mode Simulation Dynamometer, which was developed in-house, and oxygen storage and release responses were compared in actual gas.Then we investigated the possibility of on-board diagnostics of catalyst deactivation with high OSC in manifold and close-coupled positions, a diagnostic which is usually assumed to be difficult to attain with present conventional technology. We achieved finding a correlation between the HC emission of catalysts and the delay in response of two exhaust gas sensors even at high temperatures (700°C) with high gas flow rate.
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