Mn-Ce-Co-Ox/PPS催化滤料催化降解气相二英的研究

通过原位氧化法一步制备得到Mn-Ce-Co-O_x/PPS催化滤料，研究了催化剂负载量对Mn-Ce-Co-O_x/PPS催化降解呋喃的影响，进而分析了最优负载量的Mn-Ce-Co-O_x/PPS催化滤料在140~200℃对二英的催化降解规律，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/m²增加到154.2 g/m²，Mn-Ce-Co-O_x/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/m²。Mn-Ce-Co-O_x/PPS催化滤料在140~200℃对二英的脱除效率高达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种二英同系物的降解效率进行分析，发现Mn-Ce-Co-O_x/PPS对低氯代二英同系物的降解率高于高氯代同系物的降解率。

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

To decompose PCDD/Fs(polychlorinated dibenzo-p-dioxins and dibenzofurans) in flue gas, Mn-Ce-Co-O_x/PPS catalytic filter was prepared by in-situ oxidation method. The effect of catalyst loading on catalytic degradation of furan by Mn-Ce-Co-O_x/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-O_x/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/m² to 154.2 g/m², degradation efficiency of furan by Mn-Ce-Co-O_x/PPS kept increasing, and the monolayer saturated loading of Mn-Ce-Co-O_x/PPS was 120.5 g/m². Mn-Ce-Co-O_x/PPS catalytic filter can remove more than 90% of PCDD/Fs at 140—200℃. Degradation efficiencies of PCDD/Fs over Mn-Ce-Co-O_x/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-O_x /PPS to low-chlorinated dioxin homologs was higher than that of high-chlorinated homologs.