机械研磨时间对铜基甲醇合成催化剂性能的影响

Influence of Mechanical Grinding Time on Properties of Cu-based Catalyst for Methanol Synthesis

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。

Cu/ZnO/A1203 catalysts were prepared using mechanical grinding and combustion method and tested for the synthesis of methanol from CO hydrogenation. The calcination processes were monitored with TG-DSC. The catalysts were characterized by XRD, SEM, N2 adsorption, TPR and N20 oxidation and followed H2 titration. The results showed that the physicochemical properties of the as-prepared catalysts depend strongly on grinding time, and the BET surface area and the dispersion of copper species exhibit a volcano variation trend with an increase in grinding time. The catalyst obtained by grinding for 2 h exhibits the highest activity.