| 초록 |
In our previous study, we investigated the Ce/Zr ratio inCu-CeO2-ZrO2 catalysts employed in the LTS (Low Temperature Shift) step. A cubic-phase Cu-Ce0.8Zr0.2O2 catalyst (The loading amount of Cu = 20 wt%) exhibited the highest turnover frequency and lowest activation energy of the catalysts tested, and its CO conversion was maintained for 100 h. In this study, we focused on optimizing the Cu loading in a cubic Ce0.8Zr0.2O2-supported Cu catalyst to further improve its performance. For this approach, we synthesized a series of catalysts with different Cu loadings in the rangeof 20 wt% - 90 wt% and evaluated their LTS-reaction performances in the temperature range of 240oC - 320oC. As a result, the 80 wt%Cu-Ce0.8Zr0.2O2 catalyst exhibits the highest CO conversion in the temperature range from 200oC to 400oC at a GHSV of 150,494h-1. In addition, it exhibits stable activity at 240°C for 100 h. The excellent catalytic performance of this catalyst is primarily because of the high abundance of surface Cu atoms and the low activation energy. |
