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Study of Low-temperature CO Oxidation Cycle on Precious Metal-supported CeO2

Article of Honda R&D Technical Review Vol.22 No.2


Low-temperature active catalysts that oxidate CO at low temperatures and use the reaction heat produced to convert HC and NOx are available as technologies to respond to the reduction of exhaust gas temperatures as a result of the achievement of increased fuel efficiency. Pd/CeO2 catalysts, in which a palladium catalyst is supported on a cerium oxide carrier, represent one of these technologies. The mechanism of supply and resupply of active oxygen by the cerium oxide carrier was focused on and an analysis was conducted in order to increase the low-temperature activity of these catalysts. This study resulted in the determination of a mechanism of low-temperature CO oxidation able to accelerate the CO oxidation reaction from low temperatures by means of the achievement of supply of active oxygen from low temperatures through the use of highly dispersed palladium particles, and the achievement of rapid and high-volume resupply of active oxygen through the coexistence of H2O and O2.


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Author (organization or company)

Yoshiyuki NAKANISHI(Automobile R&D Center)、Hiroki TAKEORI(Automobile R&D Center)、Masanori HASHIMOTO(Automobile R&D Center)、Takayuki WATANABE(Automobile R&D Center)

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