【摘要】 在Ru（bpy）₃²⁺/Co（NH₃）₅Cl²⁺酸性水溶液（NaAc/HAc）中,以钨溴灯为光源,Na-Y型分子筛担载的过渡金属氧化物催化剂对光氧化水产氧反应具有较高的催化活性。当二元混合使用时,产氧量达5ml/h以上,氧产率为69％以上;低浓度催化剂用量时,比产氧速率最高达17.9O₂ml/h-mM金属。三元混合使用效果更佳,放氧量超过6ml/h,氧产率达92.9％。更多还原

【Abstract】 Photo-oxidation process of water to generate oxygen is more complicated than the photo-generation of hydrogen. Deposition of metal oxides on Y-zeolite is conducive to improve the activity for the photo-induced generation of oxygen from water oxidation. The oxygen generation activity of RuO2 catalyst, and mixtures of RuO2 with other transition metal oxides, ReOx and CdOx,supported on Y-zeolite prepared by impregnation has been investigated. The influence of different preparation procedures of catalysts and different reaction conditions on the oxygen photo-generation has been also examined. Reaction mixture is irradiated with a 150W/24V bromine-tungsten lamp in an acidic aqueous solution (NaAc/HAc) of Ru(bpy)5+/Co(NH3)5Cl2+.It is found that the catalytic activity of RuO2 supported on Y-zeolite is remarkably higher than that of RuO2 powder. Some binary mixtures of MeOx/Y and RuO2/Y show much higher catalytic activity than simple RuO2/Y, for example, for RuO2/Y +IrOx/Y, RuO2/Y + FeOx/Y, and RuO2/Y + ReOx/Y, the oxygen yields are 5.01,6.13, and 6.09ml/h, the conversion rates of oxygen production are 69.1, 85.1, and 84.5% respectively, at lower concentration of catalysts, the ratios of oxygen production are 16.1, 10.3, and 17.9 O2ml/h-mM metal respectively. Ternary mixtures, such as RuO2/Y + PtOx/Y + FeOx/Y, RuO2/Y + PtOx/Y + IrOx/Y, and RuO2/ Y + PtOx/Y + CdOx/Y catalysts, show even higher catalytic activity than binary mixtures, the oxygen yields are 6.34-6.69 ml/h, and the conversion rates of oxygen production are 88.1-92.9%.Binary and ternary mixtures of RuO2/Y with VIII transition metal and Re, Cd oxides deposited on Y-zeolite used in photogeneration of oxygen from water have not yet been reported in literature, except (RuO2-IrOx)/Y.更多还原