利用微乳液浸渍技术制备了负载型Pd/Al2O3膜,并用扫描电镜和原子吸收光谱对微乳液中的纳米Pd颗粒及其在Al2O3陶瓷膜载体上的形貌、分布和负载量进行了表征. 在"催化接触器"型膜反应器中,以 1,5-环辛二烯(COD)加氢作为模型反应考察了Pd/Al2O3膜的催化性能. 结果表明,采用微乳液技术制备Pd/Al2O3膜时, Pd负载量、浸渍操作方式、焙烧温度和载体孔径对Pd/Al2O3膜的催化性能有一定影响. 要获得对COD加氢反应的高催化活性和较高的中间产物环辛烯选择性,优化的Pd/Al2O3膜制备条件为: 缓慢析出Pd纳米颗粒,同时采用循环浸渍方式,焙烧温度300 ℃, 膜载体孔径1.9 μm.
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