摘要
采用简单浸渍和液相还原法制备了Ag/KOH-γ-Fe2O3催化剂,并采用X射线衍射、透射电镜和X射线光电子能谱等方法对催化剂进行了表征.结果表明,在乙酸乙酯介质中,以叔丁基过氧化氢为氧化剂,该催化剂具有较高的催化苯乙烯环氧化活性,KOH的添加可大幅度提高环氧化反应活性和选择性.表征结果显示,反应前后催化剂性质没有发生明显的变化.另外,所使用的磁性载体有利于负载型银催化剂的分离和循环利用.
The supported silver catalyst Ag/KOH-γ-Fe2O3 was prepared by simple impregnation and liquid reduction and then structurally characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The supported silver catalysts were highly efficient for the epoxidation of styrene using tert-butyl hydroperoxide as the oxidant and ethyl acetate as the reaction medium.The addition of KOH was found to increase the catalytic activity and selectivity significantly. Additionally, the magnetically recoverable γ-Fe2O3, as a support, allowed for an easy separation and recycling of the catalyst after the reaction.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第3期428-435,共8页
基金
Supported by the National Natural Science Foundation of China(20773037,21073058)
the Research Fund for the Doctoral Program of Higher Education of China(20100074110014)
the Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education,Hubei Province,South-Central University for Nationalities(CHCL10001),China
关键词
γ-氧化铁
环氧化
苯乙烯
银
纳米颗粒
磁分离
γ-iron oxide
epoxidation
styrene
silver
nanoparticle
magnetic separation
