| 초록 |
The Lean NOx Trap (LNT) catalyst technology is one of the most effective techniques to remove NOx from lean-burn engines (e.g. diesel) and has gained considerable attention since the environmental regulations on NOx emissions from diesel engines have become more stringent. In this study, we used hydrotalcite-derived Mg/Al mixed oxides as support materials for LNT catalysts instead of γ-Al2O3 which is commonly used in LNT catalysts. We synthesized hydrotalcite (HT) materials with various Mg/Al molar ratios, follwed by calcination. Pt and BaO were loaded by using incipient wetness impregnation mehtod, thus producing Pt(2wt%)-BaO(20wt%)/(Al2O3 or HT) catalysts. We investigated the effect of Mg/Al ratios in HT supported Pt-BaO catalysts on the physicochemical properties and NOx storage performance by using several analytical techniques, such as ICP, XRD, TPD, BET, and NOx uptake measurement. |
