Improved NO reduction by using metal–organic framework derived MnO(x)–ZnO

Derivatives based on metal frameworks (MOFs) are attracting more and more attention in various research fields. MOF-based derivatives x% MnO(x)–ZnO are easily synthesized by the thermal decomposition of Mn/MOF-5 precursors. Multiple technological characterizations have been conducted to ascertain the strengthening interaction between Mn species (Mn(2+) or Mn(3+)) and Zn(2+) (e.g., XRD, FTIR, TG, XPS, SEM, H(2)-TPR and Py-FTIR). The 5% MnO(x)–ZnO exhibits the highest NO conversion of 75.5% under C(3)H(6)-SCR. In situ FTIR and NO-TPD analysis showed that monodentate nitrates, bidentate nitrates, bridged bidentate nitrates, nitrosyl groups and C(x)H(y)O(z) species were formed on the surface, and further hydrocarbonates or carbonates were formed as intermediates, directly generating N(2), CO(2) and H(2)O.