微乳液法制备Pd负载型催化剂及其催化性能  

Supported Pd Nanoparticle Catalyst Prepared by Microemulsion Method for Selective Hydrogenation of Acetylene

作　　者：卫国宾[1,2] 杨思源[3] 张敬畅[1] 曹维良[1] 戴伟[2] 

机构地区：[1]北京化工大学理学院,北京100029 [2]中国石化北京化工研究院,北京100013 [3]北京服装学院材料科学与工程学院,北京100029

出　　处：《石油化工》2012年第11期1239-1244,共6页Petrochemical Technology

摘　　要：采用微乳液法合成了Pd纳米粒子,并成功地将其负载到Al2O3载体上,制备了Pd/Al2O3催化剂;采用纳米粒度分析仪、TEM、SEM和EDS等分析手段对微乳液中及催化剂表面的Pd纳米粒子进行了表征,并采用TG-DSC和XPS方法对Pd/Al2O3催化剂进行了表征。表征结果显示,在表面活性剂Tween80-正丙醇-环己烷-水微乳液体系中合成的Pd纳米粒子随水与表面活性剂Tween80的摩尔比的变化而改变,负载在Al2O3载体表面的Pd纳米粒子粒径分布均匀,粒径大小与微乳液中的Pd纳米粒子相同;立方面心结构的Pd纳米粒子在催化剂表面呈蛋壳状富集。考察了Pd/Al2O3催化剂在乙炔加氢反应中的催化性能。实验结果表明,Pd纳米粒子的粒径为2～3 nm时,Pd/Al2O3催化剂的催化性能最佳。Pd nanoparticles were prepared by a microemulsion method, and then deposited on Al2O3 support to form a supported catalyst. The obtained catalyst shows high activity in the selective hydrogenation of acetylene. The Pd nanoparticles in the microemulsion and on the catalyst surface were characterized by means of nanoparticle size analyzer, TEM, SEM and EDS. The catalyst was characterized by means of TG-DSC and XPS. It was found that the Pd nanoparticle size varied with n（H2O） ： n（Tween80） in the microemulsion system of Tween80-propanol-cyclohexane-water. The size of the Pd nanoparticles supported on Al2O3 with uniform size distribution was the same as that in the microemulsion. The Pd nanoparticles with face-centered cubic structure enriched on the surface of the catalyst with an eggshell shape. The catalytic performance of the catalysts in the selective hydrogenation of acetylene showed that the high acetylene conversion and selectivity to ethylene was achieved on the supported Pd nanoparticle catalyst in the Pd particle size range of 2-3 nm.

关 键 词：微乳液 钯纳米粒子 碳二馏分 催化加氢 选择加氢 

分 类 号：TQ426[化学工程]