结构化纳米碳纤维载体的制备与应用  

Synthesis and application of Pd Catalysts Supported on Structured Carbon Nanofibers

作　　者：吴凡[1] 朱劼[1] 李明时[1] 朱建军[1] 单玉华[1] 

机构地区：[1]江苏工业学院江苏省精细石油化工重点实验室,江苏常州213164

出　　处：《精细化工》2009年第6期561-565,579,共6页Fine Chemicals

基　　金：江苏省高校自然科学基础研究项目资助(07KJB530024);江苏省基础研究计划(自然科学基金)资助项目(BK2007044);教育部留学回国人员科研启动基金资助项目~~

摘　　要：研究了通过气相沉积法裂解甲烷在TiO2表面生长纳米碳纤维层,制备具有中孔孔径结构的结构化纳米碳纤维的方法。利用SEM-EDS和BET对该载体进行了表征。结果发现,该结构化纳米碳纤维载体的纳米碳纤维层厚度1.5～2.0μm,比表面积60.3 m2/g,其中外表面积为51.1 m2/g,只有很少的内表面积;平均孔径为5nm。在肉桂醛加氢反应中,该载体负载Pd催化剂能明显降低内扩散对反应选择性的影响,肉桂醛转化率低于56%时,氢化肉桂醛选择性达98%,明显高于常规活性炭负载型Pd催化剂。In this paper the structured carbon nanofibers were prepared by the growth of carbon nanofibers on rutile with the thermal chemical vapor deposition of methane-hydrogen mixture over the nickel-copper catalyst. The surface properties were characterized with BET and SEM - EDS. Results show that structured carbon nanofibers has larger specific surface areas,60. 3 m^2/g, which outer surface is 51.1 m^2/g, and the thickness of carbon nanofibers layer is 1.5 - 2.0 μm, the average pore diameter is 5 nm. When the structured carbon nanofibers were used as the carrier of Pd catalysts in hydrogenation of cinnamaldehyde,it was found that the structured carbon nanofibers would decrease the effect of internal diffusion significantly. When the conversion of cinnamaldehyde below 56%, the selectivity of 3-phenylpropanal was 98%, obviously higher than Pd catalysts supported on activated carbon.

关 键 词：结构化纳米碳纤维 二氧化钛 钯催化剂 肉桂醛 加氢 催化与分离提纯技术 

分 类 号：TQ032.41[化学工程]