Synthesis of Cross-linked Polymer Supported Vanadium Complexes and Their Application on Catalysis
Date Issued
2010
Date
2010
Author(s)
Hsiao, Ming-Chieh
Abstract
The main focus of this study is to immobilize the catalysts on the solid supports and make them recyclable. Compared with the general inorganic supports, the cross-linked polymer supports promoted the activities of the catalysts by providing the affinity with the reactants. Here, we synthesized poly(methyl acrylate) with different chain lengthes via atom transfer radical polymerization (ATRP), and turned it into more stable material by reaction with two kind of cross-linker CL1 and CL2 respectively, and then hydrolyzed the ester group into the carboxylate functional group under basic aqueous solution, followed by reaction of VOSO4 under neutral aqueous solution to afford the insoluble polymer complexes, which were characterized by IR、solid UV、and ICP-MASS。
This complex could be used to catalyze cyclooctene into cyclooctene oxide completely with TBHP (tert-butyl hydroperoxide) under 60 ℃ in 15hr, and the same experiment result could be reached by replacing TBHP with KHSO5 at the room temperature. Besides, a series of oxidation of olefins were performed under similar reaction condition, and the final products gave either the diols or the acids from the oxidative cleavage depending on the amounts of the oxidants used in the reaction. This type of catalyst would remain in the water layer and still mantained 90 ％ activity after 5 times recycled.
Subjects
Cross-linked Polymer
Vanadium
Catalysis
Type
thesis
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