CeO2-CuO/粉煤灰吸附SO2/NO性能分析

利用室温液相浸渍法将粉煤灰制备成CeO2-CuO/粉煤灰，提高了粉煤灰对SO2/NO的吸附效率。采用XRF、XRD、SEM等手段对其进行表征测试，结果表明，粉煤灰的晶相结构主要为石英和莫来石，且改性后表面变得更为粗糙，孔隙增多。利用吸附反应装置优化SO2/NO的反应条件，结果表明：在样品量为0.3 g、温度为50 ℃、SO2流速为8 mL·min-1、O2流速为4?mL·min-1时，CeO2-CuO/粉煤灰对SO2吸附效果最佳；在样品量为0.4?g、温度为70?℃、NO流速为6?mL·min-1、O2流速为4?mL·min-1时，对NO吸附效果最佳。共吸附会降低各自的吸附效率。利用原位FTIR分析表明：SO2在CeO2-CuO/粉煤灰表面主要生成硫酸盐和亚硫酸盐物种；NO则主要生成硝酸盐和亚硝酸盐物种。

Performance analysis of CeO2-CuO/fly ash for adsorption of SO2/NO

CeO2-CuO/fly ash prepared by liquid phase impregnation at room temperature improved its adsorption efficiency for SO2/NO. The samples were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), the results represented that fly ash’s crystal structure mainly consisted of quartz and mullite, and the surface of fly ash became coarser with more pores after modification. Adsorption-reactive device was used to optimize the reactive conditions of SO2/NO. The results showed that the CeO2-CuO/fly ash adsorbent has the best adsorption effect on SO2 when the sample weight is 0.3?g, the temperature is 50?℃, the flow rate of SO2 is 8?mL·min-1, and flow rate of O2 is 4?mL·min-1. When the sample weight is 0.4?g, the temperature is 70?℃, the flow rate of NO is 6?mL·min-1, and the flow rate of O2 is 4?mL·min-1, the adsorption effect of NO is best. Co-adsorption decreases the respective adsorption efficiency. In situ FTIR spectroscopy results showed the main species are sulfate and sulfite for SO2 adorption, and nitrate and nitrite for NO adsorption.