| 초록 |
To remove NOx more effectively, NOx Storage Reduction (NSR) technology is being used as one of the potential methods. In this study, we used hydrotalcite-derived Mg/Al mixed oxides as support materials for NSR catalysts instead of γ-Al2O3 which is commonly used in NSR catalysts. Hydrotalcite (HT) was prepared by applying co-precipitation method with the Mg/Al ratios of 1:9, 2:8, 3:7, 4:6, 5:5 and 6:4. Hydrotalcite was then calcined at 800 oC and used as NSR catalyst support. Pt and BaO were loaded by using incipient wetness impregnation method to produce Pt(2wt%)-BaO(20wt%)/(Al2O3 or HT) catalysts. All prepared catalysts were calcined at 500 oC, 650 oC and 800 oC, and the NOx storage activity of the catalysts was examined. In summary, HT-supported catalysts showed superior NOx storage performance compared with Al2O3-supported catalyst even after high temperature treatment, especially Mg/Al ratio is 4:6. Such superior property can be explained by the role of Mg which aids in improving Pt dispersion and inhibiting sintering of Pt. |
