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http://dx.doi.org/10.7316/KHNES.2012.23.6.640

Preferential CO Oxidation over Ce-Promoted Pt/γ-Al2O3 Catalyst  

Kim, Kihyeok (Hydrogen and Fuel Cell Department, Korea Institute of Energy Research)
Koo, Keeyoung (Hydrogen and Fuel Cell Department, Korea Institute of Energy Research)
Jung, Unho (Hydrogen and Fuel Cell Department, Korea Institute of Energy Research)
Yoon, Wanglai (Hydrogen and Fuel Cell Department, Korea Institute of Energy Research)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.23, no.6, 2012 , pp. 640-646 More about this Journal
Abstract
The effect of Ce promotion over 1wt% $Pt/{\gamma}-Al_2O_3$ catalysts on the CO conversion and $CO_2$ selectivity was investigated in preferential CO oxidation (PrOx) to reduce the CO concentration less than 10 ppm in excess $H_2$ stream for polymer electrolyte membrane fuel cell (PEMFC). Ce-promoted 1wt% $Pt/{\gamma}-Al_2O_3$ catalysts were prepared by incipient wetness impregnation method and the loading amount of Pt was fixed at 1wt%. The content of Ce promoter which has excellent oxygen storage and transfer capability due to the redox property was adjusted from 0 to 1.5wt%. Ce-promoted 1wt% $Pt/{\gamma}-Al_2O_3$ catalysts exhibit high CO conversion and $CO_2$ selectivity at low temperatures below $150^{\circ}C$ due to the improvement of reducibility of surface PtOx species compared with the 1wt% $Pt/{\gamma}-Al_2O_3$ catalyst without Ce addition. When Ce content was more than 1wt%, the catalytic activity was decreased at over $160^{\circ}C$ in PrOx because of competitive $H_2$ oxidation. As a result, 0.5wt% Ce is optimal content not only to achieve high catalytic activity and good stability at low temperatures below $150^{\circ}C$ in the presence of $CO_2$ and $H_2O$ but also to minimize the $H_2$ oxidation at high temperatures.
Keywords
Preferential CO Oxidation; Pt-Ce/$Al_2O_3$ catalyst; Ceria;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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