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Development of Lean NOx Catalyst with High Thermal Durability

Article of Honda R&D Technical Review Vol.19 No.1

Summary

A new metal substrate was developed to prevent the migration of alkali metals which work as NOx adsorbents and maintain a higher NOx conversion rate after thermal aging. A higher NOx conversion rate was expected after thermal aging because the metal substrate contains almost no silicon (Si), however, the NOx conversion rate after thermal aging fell below that of the cordierite substrate. This was not due to the migration of alkali metals to the metal substrate, but due to the chromium (Cr) in the metal substrate migrating to the washcoat and generating complex compounds formed with alkali metals. To help prevent this migration, the conventional metal substrate was heat-treated in air at 1100 °C to make an α-alumina barrier on the surface. This newly developed substrate showed no migration of alkali metals and almost no migration of Cr. When this substrate was used, the NOx conversion rate after heat treatment at 830 °C for 280 hours was 31% higher than that of the conventional cordierite substrate.

Reference

(1) Ohno, H., Takanohashi, T., Takaoka, N., Kuroda, O., Iizuka, H.: NOx Conversion Properties of a Mix Oxide Type Lean NOx Catalyst, SAE Paper, 2000-01-1197 (2000)
(2) Kaneeda, M., Kuroda, O., Iizuka, H., Higashiyama, K., Hiratsuka, T., Shinotsuka, N., Ohno, H., Takanohashi, T., Satoh, N.: Improvement of Thermal Resistance of Lean NOx Catalyst, SAE Paper, 2003-01-1166 (2003)
(3) Iwachido, K., Tanada, H., Watanabe, T., Yamada, N., Nakayama, O., Ando, H., Hori, M., Taniguchi, S., Noda, N., Abe, F.: Development of the NOx Adsorber Catalyst for Use with High-Temperature Condition, SAE Paper, 2001-01-1298 (2001)

Author (organization or company)

Hiroki HOSOE(Automobile R&D Center)、Masahiro SAKANUSHI(Automobile R&D Center)、Kimihiro TOKUSHIMA(Automobile R&D Center)、Tadao NISHIYAMA(Automobile R&D Center)、Masato KANEEDA(Hitachi, Ltd.)、Shogo KONYA(NIPPON STEEL CORPORATION)

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