采用固定床反应器评价了整体式催化剂Pt/γ-Al_2O_3/Ce_(0.5-x)Zr_(0.5-x)Mn_(2x)O_2去除饮食油烟的催化性能.制备了一系列不同Mn含量的Ce_(0.5-x)Zr_(0.5-x)Mn_(2x)O_2储氧材料,并考察了其作为载体对Pt/γ-Al_2O_3/Ce_(0.5-x)Zr_(0.5-x)Mn_(2x)O_2催化剂活性的影响.应用X射线衍射(XRD)、N_2物理吸附和H_2程序升温还原(H_2-TPR)等手段对催化剂进行了表征.XRD结果表明,贵金属Pt很好地分散在载体γ-Al_2O_3和Ce_(0.5-x)Zr_(0.5-x)Mn_(2x)O_2上.N_2物理吸附和H_2-TPR研究结果与催化剂活性测试能很好吻合.催化剂的活性顺序为x=0.10>x=0.15>x=0.05>x=0>x=0.20,Pt/γ-Al_2O_3/Ce_(0.4)Zr_(0.4)Mn_(0.2)O_2催化剂活性最好,油烟完全转化温度仅为495K.
The catalytic activity of the Pt/γ-Al_20_3/Ce_(0.5-x)Zr_(0.5-x)Mn_(2x)O_2 monolithic catalyst for the low-temperature catalytic combustion of cooking fume in a fixed-bed reactor was studied with a series of Ce_(0.5-x)Zr_(0.5-x)Mn_(2x)O_2 complex oxides, and the effect of the Mn amount in Pt/γ-Al_20_3/Ce_(0.5-x)Zr_(0.5-x)Mn_(2x)O_2 was further investigated. The catalyst was characterized by X-ray diffraction (XRD), N_2 adsorption, and H_2-temperature-programmed reduction (H_2-TPR). XRD results revealed that Pt was well dispersed on the γ-Al_2O_3 support and Ce_(0.5-x)Zr_(0.5-x)Mn_(2x)O_2 matrix. H_(2-)TPR and N_2 adsorption measurements showed the catalyst activity in the order x = 0.10 > x = 0.15 > x = 0.05 > x = 0 > x = 0.20. Pt/γ-Al_20_3/Ce_(0.4)Zr_(0.4)Mn_(0.2)O_2 had the highest activity (T_(90) = 495 K).
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