Study On Cu-BTC And Its Modified Materials For The Removal Of Elemental Mercury From Sintering Gas

Mercury,a highly toxic substance,threatens the environment and human health.As an important process of iron and steal smelting,sintering process is an important mercury sources.Thus,it’s necessary to remove the mercury from sintering gas.In this study,three organic frame works（MOFs）was prepared and their performance on mercury removal from sintering gas was studied.Results show that although Cu-BTC had limited Hg⁰ removal ability without HCl,but it exhibited an excellent Hg⁰ removal efficiency when HCl was added.The load of Pd significantly improved the Hg⁰ removal efficency without HCl,but the Hg⁰ removal efficency decreased over 200 ^oC.That may because the activity of Pd declined in high temperature.HCl also improved the Hg⁰ removal efficency of Pd/Cu-BTC.With and without HCl,-SH/Cu-BTC had good Hg⁰ removal efficiency,and the Hg⁰ removal efficiency in high temperature is higher than that of Pd/Cu-BTC.SO₂ inhibited the mercury removal of Cu-BTC,but the inhibition was weakened when Pd was loaded,while the addition of-SH further increased the sulfur resistance of the material.NO promoted the mercury removal performance of the materials,but this effect was not obvious when the mercury removal efficiency was relatively high.The effect of H₂O was also insignificant under all of the experimental conditions.With HCl,Hg⁰ can be removed by catalysis.Without HCl,Hg⁰can be removed by the adsorption of Cu-BTC,or by oxidation with the effect of Pd.Hg⁰ can also be removed by the combination of Hg and S.