Catalytic Roles of Metal Centers in the Selective Oxidation of Cyclohexanol by Cr(salten) Complexes Immobilized on MCM-41
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A series of transition metal complexes of 3-[N,N′-bis-3-(salicylidenamino)ethyltriamine] (salten) immobilized on MCM-41 were prepared for the solvent and additive-free selective oxidation of cyclohexanol with 30 % hydrogen peroxide (H2O2). The immobilized complexes were effective catalysts and exhibited much higher catalytic performance than their homogeneous analogues. Moreover, the metal centers were found to play important roles in the catalytic performance of immobilized complexes. When the immobilized chromium complex was used as catalyst, the optimal cyclohexanol conversion could reach 90.5 % with 100 % of the selectivity to cyclohexanone. In addition, the catalytic performance remained after being recycled five times.
KeywordsCyclohexanol Immobilized Schiff base complex Selective oxidation Solvent-free
The authors acknowledge the financial supports from the National Natural Science Foundation of China (21003073, 21203093), the Program to Cultivate Outstanding Young Key Teachers of Colleges and Universities of Jiangsu Province, the Collegiate Natural Science Fund of Jiangsu Province (12KJD150007) and the Innovation Technology Funding Project of Nanjing Institute of Technology (CKJ2010012).
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