Preparation of encapsulated Co(Salprn) complex in zeolite Y and its catalytic performance for the epoxidation of alkenes
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摘要: 采用自由配体法将双水杨醛缩丙二胺席夫碱钴配合物Co(Salprn)封装于Y型分子筛超笼中，并通过X射线衍射、漫反射UV-Vis光谱、FT-IR光谱和差热分析技术对所制备的催化剂进行了表征。该催化剂样品( [Co(Salprn)]-Y)在苯乙烯环氧化反应中较纯配合物Co(Salprn)表现出很高的催化活性。反应条件（包括溶剂、催化剂用量、异丁醛浓度和反应时间）对催化性能有较大影响。研究结果还表明,[Co(Salprn)]-Y对其他烯烃的环氧化也具有较高催化活性。其活性顺序为苯乙烯﹥环己烯﹥环辛烯﹥正辛烯。Abstract: Cobalt complex of N, N′-bis(salicylidene) propane-1,3-diamine (Co(Salprn)) was encapsulated in the supercages of zeolite Y by the flexible ligand method. The encapsulated sample [Co(Salprn)]-Y was characterized by X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, infrared spectroscopy as well as differential-thermal analysis techniques. Its catalytic performance for the epoxidation of alkenes was investigated. The results indicted that the encapsulation does not have strong influence on the framework structure of zeolitic host and [Co(Salprn)]-Y prepared exhibits much higher catalytic activity than the neat Co(Salprn) complex in the epoxidation of styrene. The catalytic performance of [Co(Salprn)]-Y is affected significantly by the reaction conditions. Moreover, [Co(Salprn)]-Y is also catalytically active for the epoxidation of a variety of other alkenes; its activity decreases in the order of styrene > cyclohexene > cyclooctene > 1-octene.
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Key words:
- zeolite Y /
- encapsulation /
- Schiff base /
- cobalt complex /
- styrene /
- epoxidation
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