Modified catalyst for gaseous-state elemental mercury oxidation and preparation method of modified catalyst

[0028] Example 1 Anhydrous MnCl 2 Add in deionized water, stir evenly, and prepare different MnCl 2 Mass fraction of impregnation solution (MnCl 2 The solubility in water is shown in Table 1), and then the dried γ-Al 2 o 3 The pellets were respectively immersed in the above solution, stirred slightly and dipped for 6 h, dried at 80 °C for 8 h, heated at 200 °C for 2 h under nitrogen purging, and then heated at 380 °C for 3 h under nitrogen purging to prepare Catalyst MnCl with different content of catalytic components 2 / γ-Al 2 o 3 . Different MnCl 2 The mass fraction of each catalyst prepared by impregnating solution vs. Hg 0 The catalytic oxidation efficiency is shown in Table 2.

[0029] Table 1 MnCl 2 Solubility in water

[0030]

[0031] Table 2 Catalytic oxidation efficiency of catalyst

[0032]

[0033] Example 2 with anhydrous MnCl 2 As a catalytic component, (NH 4 ) 6 Mo 7 o 24 4H 2 O is used as a doping modification component, and (NH 4 ) 6 Mo 7 o 24 4H 2 O and MnCl 2 Mix according to different molar ratios, add deionized water and stir evenly to obtain MnCl-containing 2 The impregnation solution with a mass fraction of 15%, and then the dried γ-Al 2 o 3 The carrier pellets were respectively immersed in the above solution, stirred slightly and immersed for 6 h, then dried at 80 °C for 8 h, heated at 200 °C for 2 h under nitrogen purging, and then heated at 380 °C for 3 h under nitrogen purging. Catalyst MoO with different content of doped modification components and catalytic components prepared 3 -MnCl 2 / γ-Al 2 o 3 . (NH 4 ) 6 Mo 7 o 24 4H 2 O and MnCl 2 The effect of each catalyst on Hg prepared by impregnating solution mixed in different molar ratios 0 The catalytic oxidation efficiency is shown in Table 3.

[0034] Table 3 Catalytic oxid

[0036] Example 3 (NH 4 ) 6 Mo 7 o 24 4H 2 O and MnCl 2 Mix at 0.5% by mole ratio, add deionized water and stir evenly to obtain 2 and (NH 4 ) 6 Mo 7 o 24 The soaking liquid of mass fraction, all the other are identical with embodiment 2. Different MnCl 2 and (NH 4 ) 6 Mo 7 o 24 The mass fraction of each catalyst prepared by impregnating solution vs. Hg 0 The catalytic oxidation efficiency is shown in Table 4.

[0037] Table 4 Catalytic oxidation efficiency of modified catalysts

[0038]