| 초록 |
Catalytic preferential oxidation (PROX) of CO in a H2-rich stream has recently attracted much attention, since it is considered as the simplest and the most effective method for CO removing from the gas mixtures containing concentrated H2 for fuel cells. In this study, a series of mesoporous Cu-Co composite oxides by a co-nanocasting-replication method using mesoporous silica KIT-6 as hard template which with the different Cu/Co ratios. The obtained materials were well-characterized by XRD, N2–adsorption, SEM, TEM, XPS, H2-TPR and CO-TPD. The results indicated that these Cu/Co composite oxides with different ratios show the smaller particle sizes than pure CuO and Co3O4. And these composite oxides can be reduced at lower temperatures than Co3O4 by H2. CO adsorption amounts over the composite oxides were significantly higher than those over Co3O4 and CuO. It is indicated that a strong interaction between Cu and Co species in these composite oxides and when the Cu/Co=1 atomic ratio at which the Cu3Co3-xO4 phase was the main component. For the preferential oxidation of CO in H2-Rich stream, the ratio of composite oxides is 5:5 showed the best catalytic activity than both Cu oxide and Co oxide and other composite oxides. |
