Pd/Al_2O_3膜的制备及其对1,5-环辛二烯加氢的催化性能  

Preparation of Pd/Al_2O_3 Membrane and Its Catalytic Performance for Hydrogenation of 1,5-Cyclooctadiene

作　　者：周永华[1] 叶红齐[1] Reinhard SCHOMCKER 

机构地区：[1]中南大学化学化工学院粉体技术研究所,湖南长沙410083 [2]柏林工业大学化学研究所

出　　处：《催化学报》2007年第9期794-798,共5页

摘　　要：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1.9μm.Abstract： The supported Pd/Al2O3 membrane samples with controllable Pd loading were prepared by impregnation with Pd-containing microemulsion. Pd nanoparticles in the microemulsion and in the pore structure of Al2O3 membrane were characterized by scanning electron microscopy and atomic absorption spectroscopy. The catalytic performance of the Pd/Al2O3 membrane samples for the hydrogenation of 1,5-cyclooctadiene over a catalytic contactor membrane reactor was measured. The results showed that the Pd loading amount, impregnation methods, calcination temperature, and pore size of the Al2O3 support affected the activity and selectivity of the Pd/ Al2O3 membrane samples. The optimal preparation conditions for Pd/Al2O3 membrane with high activity and higher selectivity for cyclooctene were that the Pd nano-particles were slowly deposited from Pd-containing microemulsion while the Al2O3 membrane support was circularly impregnated with Pd-containing microemulsion, the calcination temperature was 300 ℃ , and the pore size of the Al2O3 support was 1.9μm.

关 键 词：钯 氧化铝 膜反应器 微乳液 环辛二烯 加氢 环辛烯 环辛烷 

分 类 号：O643.32[理学—物理化学]