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  • Summary & Details

Hydrocarbon Purification Performance of Ag Impregnated Catalyzed Hydrocarbon Trap - Development of High Purification Performance System for Vehi

銀担持ゼオライトを用いた炭化水素吸着燃焼触媒の浄化性能 - 高性能排ガス浄化システムの開発

Detailed Information

Author(J)1) 長山 敏明, 2) 木島 由貴, 3) 加藤木 工三, 4) 中川 慎二, 5) 東山 和寿, 6) 冨永 成, 7) 村上 和美, 8) 伊藤 毅
Author(E)1) Toshiaki Nagayama, 2) Kijima Yuki, 3) Kouzou Katogi, 4) Shinji Nakagawa, 5) Kazutoshi Higashiyama, 6) Shigeru Tominaga, 7) Kazumi Murakami, 8) Tsuyoshi Itoh
Affiliation(J)1) 日立製作所, 2) 日立製作所, 3) 日立製作所, 4) 日立製作所, 5) 日立製作所, 6) バブコック日立, 7) バブコック日立, 8) バブコック日立
Affiliation(E)1) Hitachi,Ltd.., 2) Hitachi,Ltd.., 3) Hitachi,Ltd.., 4) Hitachi,Ltd.., 5) Hitachi,Ltd.., 6) Babcock-Hitachi K.K., 7) Babcock-Hitachi K.K., 8) Babcock-Hitachi K.K.
Abstract(J)HC吸着材としてのAg含浸ゼオライトは捕捉したHCの脱離温度を高温化する(特に芳香族)。これを用いた触媒は良好な浄化性能を示した。一方、Agが触媒の貴金属と共存すると、ライトオフ性能は模擬劣化試験後に悪化した。これに対して貴金属からAgゼオライトを分離するとエンジン耐久試験後でも燃焼性能を維持した。

Translation

Abstract(E)Catalyzed hydrocarbon (HC) trap is one of the most promising technologies to reduce unburned HC emissions from vehicles during cold start operation. Ag-impregnated zeolite as a HC adsorber can have high desorption temperatures for trapped HCs (especially for aromatics), and this can result in desirable purification performance. However, when Ag was coexistent with catalytic precious metals, the light-off performance with certain kinds of trapped HCs was deteriorated significantly after simulated aging tests. On the contrary, separation of Ag-zeolite from precious metals was effective to keep excellent combustion performance after aging. This behavior was confirmed after an engine exhaust endurance test.

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