Improved NO reduction by using metal-organic framework derived MnOx-ZnO

Abstract

Derivatives based on metal frameworks (MOFs) are attracting more and more attention in various research fields. MOF-based derivativesx% MnOx-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 (Mn2+or Mn3+) and Zn2+(e.g., XRD, FTIR, TG, XPS, SEM, H2-TPR and Py-FTIR). The 5% MnOx-ZnO exhibits the highest NO conversion of 75.5% under C3H6-SCR.In situFTIR and NO-TPD analysis showed that monodentate nitrates, bidentate nitrates, bridged bidentate nitrates, nitrosyl groups and CxHyOzspecies were formed on the surface, and further hydrocarbonates or carbonates were formed as intermediates, directly generating N2, CO2and H2O.