ZnAl水滑石负载钯催化剂的制备及催化性能

摘要

A series of hydrotalcite-supported palladium catalysts (Pd/ZnAl-LDH) were prepared with the ion exchange-reduction method,and characterized with XRD,TEM and ICP. Further,their catalytic performance for benzyl alcohol oxidation in low toxicity solvents (ethanol and water) were investigated. Solvent properties,Pd loading,O2 pressure and reaction time had great influences on the prepared catalysts. Pd/ZnAl-LDH catalyst with 2% Pd loading exhibited optimum catalytic performance in ethanol solvent,and its activity and selectivity to benzaldehyde could reach 93.6% and 93.3%, respectively.%采用离子交换-还原法制备了系列锌铝水滑石负载钯催化剂Pd/ZnAl-LDH，通过XRD、TEM和ICP对该系列催化剂进行了表征，并对其在低毒溶剂乙醇或水中苯甲醇氧化反应的催化性能进行了详细考察。研究结果表明，反应溶剂、Pd负载量、氧气压力、反应时间等对催化剂的催化性能有很大的影响，当Pd负载质量分数为2%，反应压力为0.2MPa 时，Pd/ZnAl-LDH 在乙醇溶剂中表现出最佳的催化性能，苯甲醇转化率和苯甲醛选择性可分别达到93.3%和93.6%。