| 초록 |
NH3 can be adsorbed on Lewis acidic Mnn+ species (n ≤ 4) and undergo oxidation upon the interactions with oxygens adjacent to Mnn+ species at ≥ 300 oC. This frequently results in the transformation of NH3 into undesired by-products (N2O and NO2), whose formation can be facilitated when Mnn+ species possess strong Lewis acidities. Here, we summarize our recent study on manganese oxide surfaces (Mn-CO2) subjected to supercritical CO2 extraction (SC-CO2) for selective NH3 oxidation. SC-CO2 technique was demonstrated to attenuate Lewis acidic strengths of surface Mnn+ species innate to Mn-CO2, which in turn are amicable to selectively oxidize NH3 for the exclusive formation of N2 at high temperatures. |
