复相催化反应实验中活性催化剂的探索

为了改善流动法测定催化剂活性的实验,通过原位还原置换法将Ag负载于Raney-Cu表面,制备Ag/Raney-Cu催化剂,并比较了Ag/Raney-Cu与Raney-Cu及传统ZnO/Al_2O_3催化剂对甲醇分解反应的催化性能。研究发现所制备的Ag/Raney-Cu及Raney-Cu均显示了高于ZnO/Al_2O_3催化剂的低温催化活性。在250℃时,Raney-Cu的活性高于Ag/Raney-Cu;随着温度升高,Ag/Raney-Cu的活性显著增强,当温度升高至350℃,其活性高于Raney-Cu的活性。

The Investigation on the Active Catalysts for a Heterogeneous Catalytic Reaction Experiment

To improve the catalyst activity measurements in the laboratory course, Raney-Cu and Ag/Raney-Cu, an Ag-modified Raney-Cu which was synthesized by the galvanic replacement method, were tested in the methanol decomposition reaction. Results showed that both Ag/Raney-Cu and Raney-Cu are more active than the conventional ZnO/Al₂O₃ catalyst for methanol decomposition at a large range of reaction temperatures, and Raney-Cu is more active at the lower temperature of 250℃. However, the catalytic activity of Ag/Raney-Cu increased remarkably with the increase of reaction temperature, and became more active than Raney-Cu at 350℃. This study suggests that both Raney-Cu and Ag/Raney-Cu are ideal low temperature catalysts for the catalytic activity measurements in the laboratory course.