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Co(II) Schiff base complexes on silica by sol–gel method as heterogeneous catalysts for oxidative carbonylation of aniline

Paper ID Volume ID Publish Year Pages File Format Full-Text
51472 46843 2009 5 PDF Available
Title
Co(II) Schiff base complexes on silica by sol–gel method as heterogeneous catalysts for oxidative carbonylation of aniline
Abstract

Two kinds of Co(II) Schiff base complexes, Co(salen)[N,N’-bis(salicylidene)-ethylene-diaminto cobalt (II)] and Co(salophen)[N,N′-bis(salicylidene)-o-phenyldiaminto cobalt (II)], were covalently bonded to silica matrix via a sol–gel process. Characterizations of the obtained silica materials with FTIR, UV–vis, TG and XPS spectroscopy clearly showed that the Co(II) complexes were successfully incorporated into the silica matrix. These two Co(II) complexes performed good catalytic activity in the oxidative carbonylation of aniline (AN) in the presence of methanol to methyl N-phenylcarbamate (MPC). When the reaction was carried out at 150 °C and 6 MPa (CO/O2 = 9:1) for 3 h in AN (11 mmol), 0.5 g catalyst and 0.365 g KI, the conversion of AN and selectivity of MPC were 62.6% and 87.2% for immobilized Co(salen), and 63.8% and 88.6% for immobilized Co(salophen), respectively. Furthermore, the immobilized Co(salen) could be recycled and there was no significant loss on the catalytic activity when it was reused for five times.

Keywords
Co-salen; Oxidative carbonylation; Aniline; Sol–gel process; Methyl N-phenylcarbamate
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Co(II) Schiff base complexes on silica by sol–gel method as heterogeneous catalysts for oxidative carbonylation of aniline
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 6, 15 February 2009, Pages 981–985
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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