Effective Catalyst layout for ultra thin-wall and high cell-density ceramic substrate

973118

12/31/1997

Event
SAE Brasil 97 VI International Mobility Technology Conference and Exhibit
Authors Abstract
Content
Catalytic performance can be improved by reducing bulk density (BD) and increasing geometric surface area (GSA) of ceramic substrate. Ultra thin-wall / high cell-density ceramic substrates, such as 3 mil/ 600 cpsi and 2 mil/ 900 cpsi have improved the catalytic performance over the conventional 6 mil/ 400 cpsi substrates. and are expected to help in complying with future emission regulations, as well as catalyst down-sizing. This paper describes the effects of BD and GSA using Pd-based catalysts. The significant reduction of hydrocarbons emissions was demonstrated at close-coupled location, and dual bed design was proven effective. The effectiveness at under-floor location was not as significant as the close-coupled location. This paper proposes the converter layout of dual bed close-coupled converter consisting of small volume 2 mill 900 cpsi front catalyst and large volume 3 mil/ 600 cpsi rear catalyst. The underfloor converter may be eliminated, if sufficient catalyst volume can be taken for the close-coupled converter.
Meta TagsDetails
DOI
https://doi.org/10.4271/973118
Pages
10
Citation
Umehara, K., Yamada, T., Hijikata, T., Ichikawa, Y. et al., "Effective Catalyst layout for ultra thin-wall and high cell-density ceramic substrate," SAE Technical Paper 973118, 1997, https://doi.org/10.4271/973118.
Additional Details
Publisher
Published
Dec 31, 1997
Product Code
973118
Content Type
Technical Paper
Language
English