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采用溶胶-凝胶法制备了复合型的CeO2/TiO2粉体光催化剂,用电镜和X射线粉末衍射技术对其进行了表面表征.以有机污染物甲醇的气相光催化消除为模型反应评价CeO2/TiO2催化剂的光催化活性.考察了不同活化温度和活化时间以及不同气体流速对CeO2/TiO2光催化消除甲醇性能的影响,并对该催化剂光催化消除甲醇的反应动力学进行了研究.试验结果表明,在活化温度450℃、活化时间3h条件下得到的催化剂光催化活性最高.初始浓度为10.2g/m3的甲醇在流速为4mL/min时可基本消除,达到排放标准.光催化反应符合一级动力学规律,实验测得该反应的活化能为Ea=15.63kJ/mol,指前因子A=0.5176s-1.
The composite CeO2 / TiO2 powder photocatalyst was prepared by sol-gel method and characterized by electron microscopy and X-ray powder diffraction. The gas phase photocatalytic elimination of organic pollutant was used as model reaction to evaluate the photocatalytic activity of CeO2 / The photocatalytic activity of TiO2 catalyst was investigated.The effects of different activation temperature and activation time and different gas flow rates on the performance of CeO2 / TiO2 photocatalyst to eliminate methanol were investigated and the kinetics of the photocatalytic removal of methanol by the catalyst was studied.The results show that , And the photocatalytic activity of the catalyst obtained under the activation temperature of 450 ℃ and the activation time of 3h was the highest.The methanol with the initial concentration of 10.2g / m3 could be basically eliminated at the flow rate of 4mL / min and reached the emission standard.The photocatalytic reaction met the first order Kinetic law, the experiment measured the activation energy of the reaction Ea = 15.63kJ / mol, pre-factor A = 0.5176s-1.