Silicon carbon-supported copper oxide catalysts for the selective catalytic reduction of NOx with NH3 at low temperature
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摘要: 采用湿浸渍法制备了碳化硅负载的氧化铜（CuO/SiC）催化剂，采用扫描电镜（SEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）等对其进行了表征，在模拟烟气条件下研究了该催化剂对低温NH3选择性催化还原NOx的性能。结果表明，CuO/SiC还原NO的催化活性与氧化铜含量和反应温度有关。负载质量分数为5%的CuO/SiC催化剂在低温下表现出较高的活性，虽然SO2对其催化活性略有抑制；研究发现，NO还原反应发生在被吸附的氨与气相的NO或弱吸附的NO之间。所制备的CuO/SiC催化剂为实际的工业应用提供了新的选择。Abstract: Silicon carbide supported copper oxide (CuO/SiC) catalysts were prepared by wet impregnation method and characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS); their catalytic performance in the selective catalytic reduction of NOx with NH3 at low temperature was investigated with a mimic flue gas. The results indicate that the catalytic performance of CuO/SiC in the selective catalytic reduction NO with NH3 is related to the loading of copper oxide and reaction temperature. The CuO/SiC catalyst with a CuO loading of 5% exhibits high activity at low temperature, where SO2 shows slightly inhibition upon the NO reduction activity; the NO reduction reaction over CuO/SiC may take place between the adsorbed ammonia and the gaseous or weakly adsorbed NO. Such CuO/SiC catalysts may provide a new choice for the practical removal of NOx in industry.
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Key words:
- selective catalytic reduction /
- silicon carbide /
- copper oxide /
- ammonia
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图 3 SiC(a)和5%CuO/SiC(b)的SEM照片，5%CuO/SiC的XRD谱图(c)和5%CuO/SiC的XPS(d)谱图
Figure 3 SEM images of SiC (a) and 5% CuO/SiC (b), XRD patterns of SiC and 5% CuO/SiC (c) and XPS spectrum of 5% CuO/SiC (d)
图 4 在250 ℃条件下负载CuO对CuO/SiC催化剂活性的影响
Figure 4 Effect of CuO loading on the activity of CuO/SiC in the selective catalytic reduction of NOx with NH3 at 250 ℃
图 5 反应温度对5%CuO/SiC催化剂活性的影响
Figure 5 Effect of reaction temperature on the selective catalytic reduction of NOx with NH3 over the 5% CuO/SiC catalyst reaction conditions: 0.045% NO; 0.05% NH3; 5% (volume ratio) O2; WHSV, 30000 h-1; catalyst weight, 300 mg
图 6 5%CuO/SiC催化剂的NO+O2-TPD(a)和NH3-TPD(b)谱图
Figure 6 NO+O2-TPD profiles (a) and NH3-TPD profiles (b) of the 5% CuO /SiC catalyst
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