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Catalytic oxidation of elemental mercury in flue gas on MnOx/a-Al2O3. |
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Abstract Manganese oxide impregnated on a-alumina (MnOx/a-Al2O3) was employed as catalyst on the catalytic oxidation of Hg0 in the presence of hydrogen chloride. The optimized temperature of the catalytic oxidation reaction was around 300℃, where the Hg0 oxidation efficiency was up to 91% in the presence of 20mL/m3 HCl. Hg0 oxidation efficiency was kept over 90% when the space velocity was in range of 8000 h-1 to 32000 h-1. However, it decreased quickly when the space velocity was increased from 32000 h-1 to 96000 h-1. SO2 inhibited the mercury oxidation by occupying the activity sites on the catalyst, and the oxidation efficiency was reduced by about 20% in the presence of 500mL/m3 SO2. Meanwhile, the main reaction mechanism of catalytic oxidation was discussed.
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Received: 26 August 2008
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