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Highly dispersed Cu(II), Co(II) and Ni(II) catalysts covalently immobilized on imine-modified silica for cyclohexane oxidation with hydrogen peroxide

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Title Highly dispersed Cu(II), Co(II) and Ni(II) catalysts covalently immobilized on imine-modified silica for cyclohexane oxidation with hydrogen peroxide
 
Creator ANTONY, R
MANICKAM, STD
KOLLU, P
CHANDRASEKAR, PV
KARUPPASAMY, K
BALAKUMAR, S
 
Subject FUNCTIONALIZED MESOPOROUS SILICA
TRANSITION-METAL-COMPLEXES
SOLID-PHASE EXTRACTION
SELECTIVE OXIDATION
BIS(DIAZOIMINE) LIGANDS
COPPER NANOPARTICLES
EFFICIENT CATALYST
CARBON MATERIALS
MCM-41
GEL
 
Description This paper describes the synthesis of Cu(II), Co(II) and Ni(II) catalysts immobilized on imine-functionalized silica gel through a 3-aminopropyltriethoxysilane linker. The synthesized catalysts were characterized by spectroscopic techniques, namely EDS, FTIR, UV-Vis, Si-29 MAS NMR, powder XRD and ESR spectroscopy. These analytical methods evidently confirmed the formation of silica-supported catalysts. Thermal properties of catalysts were studied between 30 and 800 degrees C by thermogravimetric-differential thermal gravimetric (TG-DTG) analysis. The surface roughness of the silica gel was increased upon modification but without losing its lumpy shape, as evidenced by SEM investigation. Magnified SEM and AFM images both suggested the high dispersive nature of the catalysts. Cyclohexane was successfully converted into cyclohexanol and cyclohexanone by the catalysts with the aid of hydrogen peroxide (oxidant). Comparatively, Cu(II) catalyst exhibited better cyclohexane conversion than the other two catalysts. The reusable nature of the catalysts was established by performing five consecutive catalytic runs with Cu(II) catalyst. Comparatively, the present reported catalytic systems were simple, reusable and effective models for higher cyclohexane conversion with better product selectivity.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2014-12-29T06:08:55Z
2014-12-29T06:08:55Z
2014
 
Type Article
 
Identifier RSC ADVANCES, 4(47)24820-24830
2046-2069
http://dx.doi.org/10.1039/c4ra01960a
http://dspace.library.iitb.ac.in/jspui/handle/100/17273
 
Language English