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摘要: 考察了制备参数及反应条件对蜂窝状堇青石基CuO/Al2O3催化剂同时脱硫脱硝活性的影响。结果表明，添加碱金属可以提高脱硫活性, 但由于促进NH3氧化而降低了脱硝活性。为了获得理想的同时脱硫脱硝活性，催化剂的适宜载铜量为6.0％，载钠量为2.0％。随着反应温度从350 ℃升高到450 ℃，该催化剂的脱硫活性逐渐升高，再生后脱硫活性都有所下降，但仍具有活性随温度升高而升高的趋势，说明脱硫过程为反应控制型；但由于温度升高，NH3氧化加剧，脱硝活性逐渐降低，所以适宜操作温度为400 ℃。在1 450 h－1～3600 h－1范围内， 空速对脱硝活性影响不大， 对脱硫活性影响较大。 对于再生催化剂，当空速由3 600 h－1降低到2 300 h－1时，硫容（SO2转化率达80％时单位质量催化剂所吸附的SO2量）不断增加，继续降低空速时硫容基本保持不变，所以适宜操作空速为2 300 h－1以下。Abstract: Honeycomb cordierite based CuO/Al2O3 catalyst was studied for simultaneous SO2 and NO removal from flue gas. It is found that the addition of sodium in the catalyst can improve SO2 removal activity. However, the sodium addition will slightly decrease NO removal activity due to the increased NH3 oxidation. With increasing the reaction temperature from 350℃ to 450℃, the SO2 removal activity increases, while the NO removal activity decreases due to the increased NH3 oxidation. Space velocity shows a slight effect on NO removal in the range of 1450h－1～3600h－1, but a strong effect on SO2 removal activity. A catalyst composition, 6.0 % copper and 2.0 % sodium, was found to be optimal for simultaneous SO2 and NO removal. The suitable reaction temperature and space velocity are about 400 ℃ and 2 300 h－1 or below, respectively.
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Key words:
- honeycomb cordierite /
- CuO/Al2O3 /
- flue gas /
- SO2 and NO removal
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