Development of a New Metal Substrate for Lean NOx Trap

This paper presents a new substrate for Lean NOx Traps (LNT) which enables high NOx conversion efficiency, even after long-term aging, when using alkali metals as the NOx adsorber. When a conventional metal honeycomb is used as the LNT substrate, the chromium in the metal substrate migrates into the...

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Bibliographic Details
Published in:SAE International Journal of Fuels and Lubricants 2009-01, Vol.1 (1), p.318-325, Article 2008-01-0806
Main Authors: Hosoe, Hiroki, Sakanushi, Masahiro, Tokushima, Kimihiro, Nishiyama, Tadao, Konya, Shogo, Kasuya, Masayuki, Kaneeda, Masato, Iizuka, Hidehiro
Format: Article
Language:English
Subjects:
Adsorption
Aging
Aging (metallurgy)
Alkali metals
Aluminum
Chromium
Cordierite
Durability
Material aging
Materials
Potassium
Stock conversion ratios
Substrates
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Summary:This paper presents a new substrate for Lean NOx Traps (LNT) which enables high NOx conversion efficiency, even after long-term aging, when using alkali metals as the NOx adsorber. When a conventional metal honeycomb is used as the LNT substrate, the chromium in the metal substrate migrates into the washcoat and reacts with the alkali metals after thermal aging. In order to help prevent this migration, we have developed a new substrate where a fine -alumina barrier is precipitated to the surface of the metal substrate. The new substrate is highly capable of preventing migration of chromium into the washcoat and greatly enhances the NOx conversion. The durability of the new substrate and emission test using a test vehicle are also examined.
ISSN:1946-3952
1946-3960
1946-3960
DOI:10.4271/2008-01-0806