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Cobalt Modification for Improving Potassium Resistance of Mn/Ce‐ZrO2 in Selective Catalytic Reduction
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AbstractThe three catalysts Mn/Ce‐ZrO2, MnCo/Ce‐ZrO2, and Mn/Co‐Ce‐ZrO2 were applied to remove NO in simulated flue gas. Their selective catalytic reduction (SCR) activity and potassium resistance were studied. Catalysts with Co as a modifier of the support exhibited the best SCR activity. The catalyst Mn/Co‐Ce‐ZrO2 had a larger surface area, higher dispersion of active components, larger amount of surface acid, and better redox characteristics than the other two catalysts, leading to a better SCR activity. X‐ray photoelectron spectroscopy results proved the higher surface Mn4+ concentration of K0.3Mn/Co‐Ce‐ZrO2. Pyridine adsorption analysis suggested that there was still a large amount of Lewis acid in Mn/Co‐Ce‐ZrO2 even after potassium poisoning, demonstrating the higher resistance of this catalyst to potassium. Mn/Co‐Ce‐ZrO2 with potassium addition had a relatively stable SCR activity in the presence of H2O and SO2.
Title: Cobalt Modification for Improving Potassium Resistance of Mn/Ce‐ZrO2 in Selective Catalytic Reduction
Description:
AbstractThe three catalysts Mn/Ce‐ZrO2, MnCo/Ce‐ZrO2, and Mn/Co‐Ce‐ZrO2 were applied to remove NO in simulated flue gas.
Their selective catalytic reduction (SCR) activity and potassium resistance were studied.
Catalysts with Co as a modifier of the support exhibited the best SCR activity.
The catalyst Mn/Co‐Ce‐ZrO2 had a larger surface area, higher dispersion of active components, larger amount of surface acid, and better redox characteristics than the other two catalysts, leading to a better SCR activity.
X‐ray photoelectron spectroscopy results proved the higher surface Mn4+ concentration of K0.
3Mn/Co‐Ce‐ZrO2.
Pyridine adsorption analysis suggested that there was still a large amount of Lewis acid in Mn/Co‐Ce‐ZrO2 even after potassium poisoning, demonstrating the higher resistance of this catalyst to potassium.
Mn/Co‐Ce‐ZrO2 with potassium addition had a relatively stable SCR activity in the presence of H2O and SO2.
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