New palladium - yttrium, palladium - manganese / anodized stainless steel wire mesh and properties of catalyst

Title: New palladium - yttrium, palladium - manganese / anodized stainless steel wire mesh and properties of catalyst
　　Authors: Song Cui
　　Degree-granting unit: Zhejiang University
　　Key words: anodic oxidation;; earth;; transition metal;; precious metals;; stainless steel mesh;; catalytic combustion
　　Summary:
　　In recent years, environmental pollution and ecological damage caused widespread concern, and industrial emissions of volatile organic Magnetic lifter compounds (Volatile Organic Compounds, called VOCs) has become an important source of environmental pollution. The catalytic combustion with its clean, efficient, economic and other characteristics, VOCs have been considered the most effective way to deal with one.
　　Metal carrier has good heat transfer performance and thermal efficiency, but due to the smooth surface, the smaller problems such as surface area, it developed slowly. How to prepare high activity and stability of the metal catalyst is the catalyst for environmental research focus. The paper used by anodic oxidation treatment stainless steel wire mesh (stainless steel wire mesh, marked SSWM) as a catalyst to the surface layer of anodic oxide film from generated, and the use of rare earth metals were prepared by impregnation method. Precious metals ( Pd-Y/SSWM), transition metals - precious metals (Pd-Mn/SSWM) two-component catalyst. These two catalysts in terms of VOCs treatment effect, or the cost and stability are achieved better results, with a very wide range of industrial applications.
　　Different series of experiments examined the catalytic activity of the catalyst, the results show that, in the rare earth metals. Precious metal two-component 0.1% Pd-4% Y / SSWM catalyst, acetone, toluene and ethyl acetate at 280 ℃, 220 ℃ and 320 ℃ to achieve complete combustion (T_ (98)), and transition metals - precious two-component 0.1% Pd-6% Mn / SSWM catalyst also showed excellent catalytic activity, acetone, toluene and ethyl acetate T_ ( 98) were 260 ℃, 220 ℃ and 320 ℃. And, Pd-Y/SSWM and Pd-Mn/SSWM two catalysts in the reaction temperature of 240 ℃, after 1000 h and 700 h for a long time stability of toluene oxidation http://www.999magnet.com/products/131-magnetic-lifter experiments, the conversion rate has remained above 98%, showing a excellent stability.
　　In addition, the use of high-resolution scanning electron microscopy (SEM), temperature programmed reduction (TPR), X optical spectroscopy (EDX), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), physical and chemical adsorption, ultrasonic vibration testing analytical testing methods, the catalyst surface morphology, surface area, species composition and activity combined with the carrier strength characterization and analysis. The results showed that, Pd-Y/SSWM and Pd-Mn/SSWM catalyst surface active component on the carrier is highly fragmented, uniform particle size, combined with a solid carrier, catalytic oxidation of VOCs with a good performance, with a good prospect.
　　Degree Year: 2010