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论文类型：期刊论文

发表时间：2013-09-10

发表刊物：APPLIED CATALYSIS A-GENERAL

收录刊物：SCIE、EI、Scopus

卷号：466

页面范围：98-104

ISSN号：0926-860X

关键字：Metal-organic framework; Postsynthetic modification; Metal-salen; Cooperative catalyst; Cyclohexane selective oxidation

摘要：A series of MOF-based catalysts, metal-salen complexes incorporated into amino-functionalized MIL-101 matrices by salicylaldehyde condensing to amino group and coordinating metal ion through one pot method, have been prepared and characterized. The successful preparation of catalysts demonstrates that postsynthetic modification (PSM) is a practical and powerful route to generate MOF-based catalyst with multiple active sites. The catalytic performances of prepared catalysts were investigated via selective oxidation of cyclohexane to cyclohexanone and cyclohexanol (MA-oil) by molecular oxygen in the absence of solvent. It was found that NH2-MIL-101(Cr)-Sal-Co, as a typical case, behaves as cooperative catalyst for cyclohexane selective oxidation. That is, salen-Co(II) attached to framework of MOF is able to assist in the generation of new radicals from peroxides via a Haber-Weiss catalytic cycle to promote conversion of cyclohexane while framework Cr ion is able to catalyze the dehydration of intermediate product cyclohexyl hydroperoxide (CHHP) to improve MA-oil selectivity. Furthermore, this catalyst exhibits good recyclability and behaves as truely heterogeneous catalyst. (C) 2013 Elsevier B.V. All rights reserved.