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Molybdenum complex tethered to the surface of activated carbon as a new recoverable catalyst for the epoxidation of olefins

Paper ID Volume ID Publish Year Pages File Format Full-Text
39690 45831 2014 8 PDF Available
Title
Molybdenum complex tethered to the surface of activated carbon as a new recoverable catalyst for the epoxidation of olefins
Abstract

•Modification of active carbon with aminopropyltrimethoxysilane gave APTS-AC material.•Reaction of APTS-AC with MoO2(acac)2 afforded a new heterogeneous catalyst with hydrophobic properties.•The prepared catalyst acts as an efficient catalyst in epoxidation of olefins and allyl alcohols.

A new recoverable catalyst for the epoxidation of olefins was developed by covalent attachment of aminopropyl groups on the surface of oxidized activated carbon (AC) and next reaction with bis(acetylacetonato)dioxomolybdenum(VI). Characterization of the prepared catalyst was performed with different physicochemical methods such as Fourier transform infrared and atomic absorption spectroscopies, scanning electron microscopy, energy-dispersive X-ray and nitrogen sorption analyses. Nitrogen adsorption–desorption analysis revealed that the textural characteristics of the support were changed during the grafting experiments but the channels remained relatively accessible despite sequential reduction in surface area, pore volume and pore size. Elemental analysis showed the presence of 0.06 mmol g−1 molybdenum in the catalyst. The prepared catalyst catalyzed the epoxidation of olefins and allyl alcohols with tert-butyl hydroperoxide (TBHP) and cumene hydroperoxide (CHP) quantitatively with excellent selectivity toward the corresponding epoxides under mild reaction conditions. The results indicated that the hydrophobicity of the AC support promoted the catalytic efficiency of the catalyst in the epoxidation of olefins.

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Keywords
Molybdenum; Activated carbon; Tethering; Heterogeneous catalysis; Epoxidation
First Page Preview
Molybdenum complex tethered to the surface of activated carbon as a new recoverable catalyst for the epoxidation of olefins
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 478, 20 May 2014, Pages 211–218
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis