The oxidation adsorption of Hg⁰ by metal oxide is an effective method to remove Hg⁰. A novel high-performance catalyst Cr₂O₃-MOF was prepared by direct calcination of MIL-101 (Cr) to improve the mercury adsorption capacity of MOFs at lower temperature ranges, overcome the weak resistance to different flue gas components and increase the recycling capacity. Cr₂O₃-MOF retains the skeleton structure of MOF with small particle sizes and scattered active sites. The oxygen vacancy (O_V) formed after calcination can be filled by free oxygen to adjust the catalytic performance of the surface. Thus, Cr₂O₃-MOF has a mercury removal capacity to be reached at 100% in a wide temperature range (30–200 °C), especially has the ability of mercury adsorption at room temperature that many MOF adsorbents do not have. After continuous adsorption at 30 °C for 50 h, the mercury removal efficiency was maintained at 90.3%, and it could be recycled. Cr₂O₃-MOF also has excellent resistance to flue gas components such as SO₂, NH₃, NO, and H₂O. Based on different characterization methods and density functional theory (DFT), the transition state theory explains that adsorbed oxygen (O_Ads) filled in O_V has higher mercury capture activity than that of natural lattice oxygen (O_Lat) in the adsorbent. More importantly, compared with noble metal supported monatomic catalysts, Cr₂O₃-MOF has a lower cost with higher mercury removal efficiency, it has more industrial application prospects.

^{金属氧化物对Hg 0}的氧化吸附是去除Hg ⁰的有效方法。直接煅烧MIL-101(Cr)制备新型高性能催化剂Cr 2 O 3 -MOF，提高MOFs在较低温度范围内的汞吸附能力，克服对不同烟气成分的弱抵抗力_，提高_回收率容量。Cr ₂ O ₃ -MOF保留了MOF的骨架结构，粒径小，活性位点分散。煅烧后形成的氧空位(O _V )可以被游离氧所填补，从而调节表面的催化性能。因此，Cr ₂ O ₃-MOF在很宽的温度范围内（30-200℃）具有100%的除汞能力，尤其是具有许多MOF吸附剂所不具备的室温吸附汞的能力。30℃连续吸附50h后，脱汞效率保持在90.3%，可循环使用。Cr ₂ O _{3 -MOF对SO 2}、NH ₃、NO和H ₂ O等烟气成分也具有优异的抵抗能力。基于不同的表征方法和密度泛函理论（DFT），过渡态理论解释了吸附氧(O _Ads ) 填充在 O _V中的汞捕获活性高于天然晶格氧 (O_Lat ) 在吸附剂中。更重要的是，与贵金属负载单原子催化剂相比，Cr ₂ O ₃ -MOF成本更低，脱汞效率更高，更具工业应用前景。