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采用钴-铁氧化物制备复合催化剂,研究烟气中零价汞的催化氧化脱除性能。考察了催化剂制备的焙烧温度、不同活性组分及不同负载量、烟气温度、NH3/NO及SO2浓度对零价汞催化去除效率的影响规律。结果表明:以Co和Fe作为活性组分的复合催化剂脱汞效率明显高于单一金属催化剂,8%Co-2%Fe的催化剂活性最好,催化剂最佳活性温度为300℃,焙烧温度为400℃时活性最好,烟气中NH3/NO及SO2抑制催化剂的脱汞活性。温度为300℃时可获得86.7%的零价汞脱除效率。
Cobalt - iron oxide composite catalysts were prepared to study the catalytic oxidation of zero-valent mercury in flue gas. The effects of calcination temperature, different active components and different loadings, flue gas temperature, NH3 / NO and SO2 concentration on the catalytic efficiency of zero-valent mercury removal were investigated. The results showed that the mercury removal efficiency of the composite catalyst with Co and Fe as the active components was significantly higher than that of the single metal catalyst. The catalyst activity of 8% Co-2% Fe was the best. The optimum catalyst activity temperature was 300 ℃ and the calcination temperature was 400 ℃, the activity is the best, NH3 / NO and SO2 in the flue gas inhibit the mercury removal activity of the catalyst. Zero-valent mercury removal efficiency of 86.7% was obtained at 300 ° C.