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Salen-Co(II) complex incorporated into amino-functionalized MIL-101(Cr) through postsynthetic modification as a cooperative catalyst for cyclohexane selective oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
40295 45849 2013 7 PDF Available
Title
Salen-Co(II) complex incorporated into amino-functionalized MIL-101(Cr) through postsynthetic modification as a cooperative catalyst for cyclohexane selective oxidation
Abstract

•Salen-Co(II) was incorporated into amino-functionalized MIL-101(Cr) by PSM.•NH2-MIL-101(Cr)-Sal-Co behaves as cooperative catalyst for cyclohexane oxidation.•Salen-Co(II) attached to MOF is able to promote cyclohexane conversion.•Framework Cr ion is able to improve KA-oil selectivity and K/A-ratio.

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 (KA-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 KA-oil selectivity. Furthermore, this catalyst exhibits good recyclability and behaves as truely heterogeneous catalyst.

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Keywords
Metal-organic framework; Postsynthetic modification; Metal-salen; Cooperative catalyst; Cyclohexane selective oxidation
First Page Preview
Salen-Co(II) complex incorporated into amino-functionalized MIL-101(Cr) through postsynthetic modification as a cooperative catalyst for cyclohexane selective oxidation
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 466, 10 September 2013, Pages 98–104
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis