Study of Ceramic Catalyst Optimization for Emission Purification Efficiency

In this study, to satisfy increasing strict emission regulations , the conversion efficiency of a 0.11 mm (4 mil ) thin-wall catalyst is discussed. The effects of catalyst bulk density on reducing heat mass to improve catalyst emission conversion in the early cold transient mode (Bag 1 in the FTP-75...

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Bibliographic Details
Published in:SAE transactions 1994-01, Vol.103, p.427-439
Main Authors: Machida, Minoru, Yamada, Toshio, Makino, Mikio
Format: Article
Language:English
Subjects:
Automobile exhaust
Ceramic materials
Control systems
Density
Engines
Exhaust gases
FTP
Porosity
Porous materials
Sensors
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Summary:In this study, to satisfy increasing strict emission regulations , the conversion efficiency of a 0.11 mm (4 mil ) thin-wall catalyst is discussed. The effects of catalyst bulk density on reducing heat mass to improve catalyst emission conversion in the early cold transient mode (Bag 1 in the FTP-75 mode)is quantitatively discussed. To analyze the effects of low heat mass, catalyst's bed temperatures were measured. Effects of the geometric surface area (GSA) and volume of the catalyst were also analyzed. An early feedback control system with an HEGO oxygen sensor and a secondary air injection control system with an original control system on THC ,CO ,and NOx emission amounts.
ISSN:0096-736X
2577-1531