Mn-Ce-Co-Ox/PPS催化滤料催化降解气相二[口恶]英的研究

Study on catalytic degradation of PCDD/Fs over Mn-Ce-Co-Ox/PPS catalytic filter

通过原位氧化法一步制备得到Mn-Ce-Co-Ox/PPS催化滤料,研究了催化剂负载量对Mn-Ce-Co-Ox/PPS催化降解呋喃的影响,进而分析了最优负载量的Mn-Ce-Co-Ox/PPS催化滤料在140~200℃对二[口恶]英的催化降解规律,同时采用SEM、EDS和XRD等表征手段对复合催化滤料的结构及性能进行表征。结果如下:催化剂负载量由81.8 g/m^(2)增加到154.2 g/m^(2),Mn-Ce-Co-Ox/PPS对呋喃的降解效率呈增加趋势,催化剂单层饱和负载量为120.5 g/m^(2)。Mn-Ce-Co-Ox/PPS催化滤料在140~200℃对二[口恶]英的脱除效率高达90%以上,降解效率随着反应温度升高而快速提升,200℃降解效率达到最高,为78.01%,表现出良好的催化降解性能。对17种二[口恶]英同系物的降解效率进行分析,发现Mn-Ce-Co-Ox/PPS对低氯代二[口恶]英同系物的降解率高于高氯代同系物的降解率。

To decompose PCDD/Fs(polychlorinated dibenzo-p-dioxins and dibenzofurans)in flue gas,Mn-Ce-Co-Ox/PPS catalytic filter was prepared by in-situ oxidation method.The effect of catalyst loading on catalytic degradation of furan by Mn-Ce-Co-Ox/PPS catalytic filter was investigated.Furthermore,effect of operating temperature in the range of 140—200℃on catalytic degradation of PCDD/Fs by Mn-Ce-Co-Ox/PPS catalytic filter was studied.Several physicochemical methods,including SEM(scanning electron microscope),EDS(energy dispersive spectroscopy)and XRD(X-ray diffraction)were employed to characterize the structure and properties of the composite catalytic filter.With the increase of catalyst loading from 81.8 g/m^(2) to 154.2 g/m^(2),degradation efficiency of furan by Mn-Ce-Co-Ox/PPS kept increasing,and the monolayer saturated loading of Mn-Ce-Co-Ox/PPS was 120.5 g/m^(2).Mn-Ce-Co-Ox/PPS catalytic filter can remove more than 90%of PCDD/Fs at 140—200℃.Degradation efficiencies of PCDD/Fs over Mn-Ce-Co-Ox/PPS showed a rapid growth with the increase of reaction temperature,achieving the highest of 78.01%at 200℃.The degradation efficiency of 17 dioxin homologs was analyzed,and it was found that the degradation rate of Mn-Ce-Co-Ox/PPS to low-chlorinated dioxin homologs was higher than that of high-chlorinated homologs.