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活性炭负载Pt/Fe3O4催化剂及其选择性转移加氢肉桂醛的催化性能
张勇,陈春*,龚万兵,宋杰瑶,苏燕平,张海民,汪国忠,赵惠军*
作者单位E-mail
张勇   
陈春*  chenchun2013@issp.ac.cn 
龚万兵   
宋杰瑶   
苏燕平   
张海民   
汪国忠   
赵惠军*  h.zhao@griffith.edu.au 
摘要:
关键词:  
DOI:10.1063/1674-0068/30/cjcp1703059
分类号:
基金项目:This work is supported by the National Natural Science Foundation of China (No.51372248,No.51432009 and No.51502297),Instrument Developing Project of the Chinese Academy of Sciences (No.yz201421),the CAS/SAFEA International Partnership Program for Creative Research Teams of Chinese Academy of Sciences,China.
Chemoselective Transfer Hydrogenation of Cinnamaldehyde over Activated Charcoal Supported Pt/Fe3O4 Catalyst
Yong Zhang,Chun Chen*,Wan-bing Gong,Jie-yao Song,Yan-ping Su,Hai-min Zhang,Guo-zhong Wang,Hui-jun Zhao*
Abstract:
A variety of spherical and structured activated charcoal supported Pt/Fe3O4 composites with an average particle size of ~100 nm have been synthesized by a self-assembly method using the difference of reduction potential between Pt (IV) and Fe (Ⅱ) precursors as driving force. The formed Fe3O4 nanoparticles (NPs) effectively prevent the aggregation of Pt nanocrystallites and promote the dispersion of Pt NPs on the surface of catalyst, which will be favorable for the exposure of Pt active sites for high-efficient adsorption and contact of substrate and hydrogen donor. The electron-enrichment state of Pt NPs donated by Fe3O4 nanocrystallites is corroborated by XPS measurement, which is responsible for promoting and activating the terminal C=O bond of adsorbed substrate via a vertical configuration. The experimental results show that the activated charcoal supported Pt/Fe3O4 catalyst exhibits 94.8% selectivity towards cinnamyl alcohol by the transfer hydrogenation of cinnamaldehyde with Pt loading of 2.46% under the optimum conditions of 120℃ for 6 h, and 2-propanol as a hydrogen donor. Additionally, the present study demonstrates that a high-efficient and recyclable catalyst can be rapidly separated from the mixture due to its natural magnetism upon the application of magnetic field.
Key words:  Activated charcoal supported Pt/Fe3O4 catalysts  Redox method  Transfer hydrogenation Cinnamaldehyde  Cinnamyl alcohol