Study on the mercury removal using Mn loaded Fe-based MOFs

The Mn/MIL-100 (Fe) mercury removal agent loaded with 6% Mn was prepared by impregnation method using Fe-based metal organic framework (MOFs) as the support. A set of fixed bed reactor apparatus was installed and used to study the performance of Mn/MIF-100(Fe) to remove elemental mercury (Hg⁰) in the simulated flue gas. The materials were characterized by XRD, XPS, BET and TGA. The results showed that Mn/MIF-100 (Fe) had high efficiency in removing elemental mercury (Hg⁰). When the GHSV was 180000 h^-1 at 250℃, the mercury removal (Hg⁰) efficiency was above 82%. The main mercury removal mechanism of Mn/MIF-100 (Fe) was oxidation, and the loading of Mn promoted the adsorption of mercury. With the increase of flue gas temperature, the oxidation efficiency of elemental mercury was gradually increased. O₂ and NO promoted the removal of mercury while SO₂ and NH₃ inhibited the removal of mercury. Mn/MIL-100(Fe) had a strong adaptability to the complex flue gas as a whole.