Preparation And Characterization Of New Type Of Pd-Y,Pd-Mn/Anodic Oxidation Stainless Steel Wire Mesh Catalysts For Volatile Organic Compounds Oxidation

Volatile organic compounds (VOCs), emitted from many industrial processes, are considered as main contributors to the atmospheric pollution and to be dangerous to human health. Catalytic oxidation is quite promising in the VOCs elimination because of its high efficiency, economic and without sec-pollution.Therefore, a new type of catalyst with low temperature catalytic combustion of VOCs and good stability for a long reaction time is urgently required, especially for industrial application. Compared with familiar catalyst supports, metallic support catalyst applied for VOCs elimination are commercially attractive because of its good temperature conductivity. However, the development of metallic monolith catalyst is limited by the small surface area and poor adhesion of the active component with the metallic support. The anodic oxidation treatment was applied to design a porous membrane over the stainless steel screen surface.In this thesis, several catalysts using stainless steel wire mesh (SSWM) after anodic oxidation treatment as support was prepared. The Pd-Y/SSWM, Pd-Mn/SSWM catalysts were prepared by impregnation method. The results shows that the total oxidation temperature for toluene, acetone, and ethyl acetate was at 220°C, 280°C, and 320°C on 0.1%Pd-4%Y/SSWM catalyst, while the T98 of toluene, acetone and ethyl acetate was respectively at220°C,260°C and 320°C on 0.1%Pd-6%Mn/SSWM catalyst. Moreover, the Pd-Y/SSWM and Pd-Mn/SSWM catalyst shows stable activity under the reaction of toluene oxidation at 240°C for over 1000 h and 700 h, respectively.In addition, the surface structure and properties were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Temperature programmed reduction (TPR), X-ray powder diffraction (XRD), Accelerated Surface Area and Porosimetry System and so on. The results show that the active components homogeneously distribute on the catalyst suface. This two type of catalysts exhibite good application prospects.