Pt/Fe_3O_4@C磁响应核壳催化剂上肉桂醛选择性加氢性能  

Selective Hydrogenation of Cinnamaldehyde on Core-Shell Structured Pt/Fe_3O_4@C Magnetically Responsive Catalysts

作　　者：严力[1] 余建雁[1] 肖强[1] 钟依均[1] 朱伟东[1] 

机构地区：[1]浙江师范大学物理化学研究所先进催化材料教育部重点实验室,浙江金华321004

出　　处：《广东化工》2015年第14期16-18,共3页Guangdong Chemical Industry

基　　金：国家自然科学基金(No.21101139;21371152)

摘　　要：采用溶剂热法合成了Pt/Fe3O4@C磁响应核壳催化剂,以扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和超导量子干涉磁强计(SQUID)对催化剂的结构和磁性质进行了表征。研究发现Pt颗粒均匀地分散在碳层上,Pt/Fe3O4@C催化剂显示了良好的超顺磁性。研究了Pt/Fe3O4@C磁响应催化剂上肉桂醛(CAL)的选择性加氢反应,结果显示催化剂具有良好的C=O加氢活性,在考察的条件下,肉桂醛转化率在60%左右时,肉桂醇选择性可达96%以上。催化剂在外加磁场作用下可以高效地从液相反应体系中分离,经多次循环使用后仍具有良好的催化性能。Magnetically responsive core-shell structured Pt/Fe3O4@C catalysts were synthesized by a solvothermal method. Various techniques such as scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, X-ray diffraction（XRD）, and superconducting quantum interference device（SQUID） were used to characterize the structure and magnetic properties of the prepared Pt/Fe3O4@C catalysts. The results reveal that Pt particles are uniformly dispersed on the carbon shell. Additionally, the magnetic measurements show that the magnetically responsive Pt/Fe3O4@C catalysts display excellent superparamagnetic properties at room temperature. Selective hydrogenation of cinnamaldehyde on the catalysts was carried out in a high-pressure batch reactor, showing a superior activity in the hydrogenation of the C=O bond and a selectivity of 96 % to cinnamyl alcohol with a cinnamaldehyde conversion of about 60 %. Additionally, the catalysts can be efficiently recovered from the reaction medium under the external magnetic field and maintain its catalytic properties after used for several recycles.

关 键 词：超顺磁性 铂 肉桂醛 核壳催化剂 选择性加氢 

分 类 号：O643[理学—物理化学]