Preparation and application of low-temperature anti-sulfur SCR (Selective Catalytic Reduction) catalyst for removing nitrogen oxide in ship tail gas

[0019] Embodiment 1. A method for preparing a low-temperature anti-sulfur SCR catalyst for removing nitrogen oxides from ship exhaust includes the following steps:

[0020] (1) Dissolve chromium sulfate, zirconium chloride and cerium nitrate inorganic salts in water according to a certain proportion, respectively, to prepare chromium sulfate aqueous solution, zirconium chloride aqueous solution and cerium nitrate aqueous solution with a molar concentration of 0.7 mol / L, and then combine the above Three kinds of aqueous solutions are mixed, denoted as solution D, in solution D, the molar ratio of Cr 3+ : Zr 4+ : Ce 4+ = 8: 2: 0.3, the ammonia solution is prepared into an ammonia solution with a molar concentration of 0.3 mol / L, which is recorded as solution E;

[0021] (2) Drop solution E dropwise into the container containing solution D, while stirring vigorously, control the pH value of the mixed solution by adjusting the dropping rate of solution E to make the end point of titrat

[0025] Embodiment 2. A method for preparing a low-temperature anti-sulfur SCR catalyst for removing nitrogen oxides from ship exhaust includes the following steps:

[0026] (1) Dissolve chromium chloride, zirconium sulfate, and cerium sulfate inorganic salts in water in a certain proportion, respectively, to prepare chromium chloride aqueous solution, zirconium sulfate aqueous solution and cerium sulfate aqueous solution with a molar concentration of 1mol / L, and then combine the three The aqueous solution is mixed, denoted as solution D, in solution D, the molar ratio of Cr 3+ : Zr 4+ : Ce 4+ = 8: 2: 0.5, the ammonia solution is prepared into an ammonia solution with a molar concentration of 1 mol / L, which is recorded as solution E;

[0027] (2) Drop solution E dropwise into the container containing solution D, while stirring vigorously, control the pH value of the mixed solution by adjusting the dropping rate of solution E to make the end point of titration pH value 8, and continu

[0031] Embodiment 3. A preparation method of a low-temperature anti-sulfur SCR catalyst for removing nitrogen oxides from ship exhaust, including the following steps:

[0032] (1) Dissolve chromium nitrate, zirconium nitrate and cerium nitrate inorganic salts in water according to a certain proportion, respectively, to prepare chromium nitrate aqueous solution, zirconium nitrate aqueous solution and cerium nitrate aqueous solution with a molar concentration of 0.5 mol / L, and then combine the three aqueous solutions Mixing is marked as solution D, in solution D, the molar ratio of Cr 3+ : Zr 4+ : Ce 4+ =8:2:1, mix the aqueous ammonia solution into an aqueous ammonia solution with a molar concentration of 0.5 mol / L, and record it as solution E;

[0033] (2) Drop solution E dropwise into the container containing solution D, while stirring vigorously, control the pH value of the mixed solution by adjusting the dropping rate of solution E to make the end point of titration pH 9 and cont