催化燃烧VOCs的三种过渡金属催化剂的活性比较

Activity Comparison of Three Transition Metal Catalysts Used in the Catalytic Combustion of VOCs

利用浸渍法将过渡金属硝酸盐溶液沉积在 γ Al2 O3上 ,通过焙烧制得三种过渡金属氧化物催化剂CuO/γ Al2 O3、CdO/γ Al2 O3和NiO/γ Al2 O3.通过催化燃烧销毁乙醇、丙酮和甲苯的实验 ,对催化剂活性进行了评价 .实验结果表明 ,在催化剂作用下 ,三种挥发性有机化合物VOCs催化燃烧的起燃温度和完全燃烧温度都明显低于它们的燃点 ,其中CuO/γ Al2 O3催化剂的催化活性优于CdO/γ Al2 O3和NiO/γ Al2 O3催化剂 ,它对丙酮、乙醇和甲苯的催化起燃温度分别是 180 ,190和 2 30℃ ,另外对于催化燃烧VOCs 。

Three transition metal catalysts, CuO/γ-Al 2O 3, CdO/γ-Al 2O 3 and NiO/γ-Al 2O 3, were prepared by depositing transition metal nitrate solutions on γ-Al 2O 3 via impregnation. The catalytic activities of these three catalysts were compared by the catalytic combustion experiments of ethanol, acetone and toluene. Experimental results show that both the light-off temperature and the total conversion temperature of the catalytic combustion of these three volatile organic compounds (VOCs) are much lower than the corresponding burning points, that CuO/γ-Al 2O 3 is of an more excellent catalytic activity than CdO/γ-Al 2O 3 and NiO/γ-Al 2O 3, that the light-off temperatures of the catalytic combustion of acetone, ethanol and toluene catalyzed by CuO/γ-Al 2O 3 are respectively 180, 190 and 230 ℃, and that the stronger the polarity of VOCs is, the easier the corresponding oxidation is.