Cage type mesoporous ferrosilicate catalysts with 3D structure for benzylation of aromatics

C Anand; S V Priya; G Lawrence; D S Dhawale; S Varghese; Mohammad A Wahab; K S Prasad; A Vinu

doi:10.1016/j.cattod.2012.08.010

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Cage type mesoporous ferrosilicate catalysts with 3D structure for benzylation of aromatics

Journal article

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Cage type mesoporous ferrosilicate catalysts with 3D structure for benzylation of aromatics

C Anand, S V Priya, G Lawrence, D S Dhawale, S Varghese, Mohammad A Wahab, K S Prasad and A Vinu

Catalysis Today, Vol.204, pp.125-131

2013

DOI: https://doi.org/10.1016/j.cattod.2012.08.010

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Abstract

liquid-phase

benzylation

ferrosilicate

mesoporous

The Friedel-Crafts benzylation of benzene and various substituted benzenes employing benzyl chloride as an alkylating agent over a series of three-dimensional cage type mesoporous ferrosilicate (FeKIT-5) catalysts was investigated. These FeKIT-5 materials with different nSi/n Fe and ratios were synthesized hydrothermally using polymeric pluronic F127 surfactant in a highly acidic medium and characterized using various physicochemical techniques. The characterization results confirmed that the prepared materials exhibit a well-ordered 3D porous structure with cage type pores and excellent textural characteristics such as high surface areas (935-1130 m2 g-1) and large pore volumes (0.57-0.76 cm3 g-1). The unit cell constant of the samples increased with increasing the iron content of the samples, confirming the incorporation of iron in the silica framework structure of KIT-5. UV-vis results revealed that most of the Fe atoms in FeKIT-5 are in tetrahedral coordination and occupy framework position. It was found that the iron incorporated mesoporous silica materials exhibited a high conversion and selectivity for benzylation under liquid phase condition. The influence of various parameters such as temperature, time on stream, nBenzene/nBC ratio and the n Si/nFe ratio of the catalyst affecting the activity of the catalyst on the benzylation of benzene using benzyl chloride was investigated. The study was also extended to the benzylation of toluene, p-xylene, mesitylene and anisole in order to check the catalytic performance of the catalyst over different electron donating substituents. The reaction kinetics of benzene benzylation over FeKIT-5 catalyst was also investigated. The catalytic activity of FeKIT-5 catalyst was also compared with AlSBA-15, FeHMS and pure mesoporous silica KIT-5. Among the catalysts studied, FeKIT-5(7) showed the highest activity with a complete conversion of benzyl chloride and 100% selectivity to diphenylmethane in 35 min under the optimized reaction condition. Crown Copyright ©2012 Published by Elsevier B.V. All rights reserved.

Details

Title: Cage type mesoporous ferrosilicate catalysts with 3D structure for benzylation of aromatics
Authors: C Anand (Author) - University of Queensland
S V Priya (Author) - University of Queensland
G Lawrence (Author) - University of Queensland
D S Dhawale (Author) - University of Queensland
S Varghese (Author) - University of Queensland
Mohammad A Wahab (Author) - University of Queensland
K S Prasad (Author) - University of Queensland
A Vinu (Author) - University of Queensland
Publication details: Catalysis Today, Vol.204, pp.125-131
Publisher: Elsevier BV
Date published: 2013
DOI: 10.1016/j.cattod.2012.08.010
ISSN: 0920-5861
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99451023402621
Output Type: Journal article

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