C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 3/58 (2006.01) B01D 53/86 (2006.01) B01J 23/42 (2006.01) C10K 3/04 (2006.01) H01M 8/06 (2006.01)
Patent
CA 2263393
The activity of a carbon monoxide-selective oxidation catalyst is increased, and the temperature range in which the catalyst activity for facilitating a carbon monoxide-selective oxidation becomes sufficiently high is expanded. A CO- selective oxidation unit contains carbon monoxide-selective oxidation catalysts having catalyst metals including platinum and ruthenium. The interior of the unit is divided into a plurality of regions. An upstream-end region has only ruthenium as a catalyst metal. A downstream-end region has only platinum as a catalyst metal. In intermediate regions between these regions, platinum and ruthenium as catalyst metals are present in mixed states. The ruthenium proportion becomes higher toward the upstream-end region. Therefore, the temperature range in which the activity for facilitating the CO- selective oxidation becomes sufficiently high also becomes higher toward the upstream- end region in the CO-selective oxidation unit.
Gowling Lafleur Henderson Llp
Toyota Jidosha Kabushiki Kaisha
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