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采用机械研磨燃烧法在不同研磨时间下制备了系列Cu/ZnO/Al2O3催化剂,并评价了其在一氧化碳加氢制备甲醇反应中的活性。催化剂前驱体的焙烧过程通过热重-差热分析仪(TG-DSC)监测。采用X射线衍射(XRD)、扫描电镜(SEM)、N2吸附、程序升温还原(TPR)和N2O氧化后氢气滴定等方法对催化剂进行了表征。结果表明,催化剂的结构性质与研磨时间密切相关,催化剂的比表面积和铜原子的分散度随研磨时间延长先增大后减小,研磨2 h制得的催化剂显示了最高的催化活性。
A series of Cu / ZnO / Al2O3 catalysts were prepared by mechanical grinding combustion at different milling times and their catalytic activity in the methanol reaction of hydrogenation of carbon monoxide was evaluated. The calcination of the catalyst precursor was monitored by a thermogravimetry-differential thermal analyzer (TG-DSC). The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption, temperature programmed reduction (TPR) and hydrogen peroxide titration after N2O oxidation. The results show that the structural properties of the catalyst are closely related to the milling time. The specific surface area and the copper atom dispersion of the catalyst first increase and then decrease with the prolongation of milling time. The catalyst prepared after milling for 2 h shows the highest catalytic activity.