SBA-15为载体制备的铜基催化剂催化甲醇脱氢制甲酸甲酯

以SBA-15为载体,分别用离子交换法和浸渍法制备铜基催化剂,考察不同制备方法、催化剂组成和反应条件等对催化剂在甲醇脱氢制甲酸甲酯反应中催化性能的影响,用TG、XRD、TPR等方法对制备的催化剂进行表征。结果表明,离子交换法制备的催化剂其活性高于浸渍法制备的催化剂。催化剂用量为0.3g时,铜氨配合物溶液制备的Cu（am）-SBA-15催化剂,在最佳反应温度为250℃、进料量40mL.h-1时,甲醇转化率和甲酸甲酯选择性分别为18.81%和87.41%;浸渍法制备的Cu-ZnO-SBA-15在最佳反应温度为270℃、进料量为14mL.h-1时,转化率和产物选择性分别为13.41%和84.51%。实验还表明Cu和Cu2＋对甲醇脱氢制甲酸甲酯反应均有催化活性,且前者明显高于后者。

Dehydrogenation of Methanol to Methyl Formate over SBA-15 Supported Copper-Based Catalysts

Using SBA-15 as the support,copper-based catalysts were prepared by ion exchange and impregnation methods respectively.Different preparation methods,catalysts composition and reaction conditions were studied for the influence of catalytic performance and the catalysts were characterized by TPR,XRD and TPR.The results showed that the activity of catalyst prepared by ion exchange was higher than the activity of catalyst prepared by impregnations.When the amount of catalyst was 0.3 g,the reaction temperature was 250 ℃,and the flow rate of methanol was 40 mL·h-1,the conversion of methanol and the selectivity of methyl formate was 18.81% and 87.41% respectively,using the Cu（am）-SBA-15 catalyst prepared by ion exchange.When the reaction temperature was 270 ℃,flow rate of methanol was 14 mL·h-1,the conversion of methanol and the selectivity of methyl formate were 13.41% and 84.51% respectively,using the Cu-ZnO-SBA-15 catalyst prepared by impregnation.The results also revealed that Cu（0） and Cu2＋ all had catalytic activity,but the catalytic activity of Cu（0） was obviously higher than that of Cu2＋.