Synthesis of amine functionalized mesoporous silicas templated by castor oil for transesterification

Abstract

Mesoporous silicas were synthesized via a surfactant-templated sol-gel route using castor oil as the templating agent under acidic medium. The resulting silicas were subsequently amine functionalized with 3-aminopropyltriethoxysilane (NH2-MTS), [3-(2-aminoethylamino)-propyl]trimethoxysilane (NN-MTS), and [3-(diethylamino)propyl]trimethoxysilane(DN-MTS) to introduce surface basicity. Surface physicochemical properties were characterized by field emission gun scanning electron microscopy (FEGSEM), nitrogen porosimetry, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS). As-synthesised materials exhibit type IV adsorption-desorption isotherms characteristic of mesoporous structures. Clusters of spherical shaped materials were observed by FEGSEM, suggesting growth of silica occurs within colloidal dispersions. High-resolution N 1s XP spectra and DRIFT spectra confirmed the presence of amine groups in the organo-amine functionalised mesoporous silicas. The amine functionalised mesoporous silicas were active for the transesterification of tributyrin with methanol, with conversion found to increase from NH2-MTS< NN-MTS< DN-MTS.

Publication DOI: https://doi.org/10.1557/adv.2018.347
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > Chemical Engineering & Applied Chemistry
Engineering & Applied Sciences > European Bioenergy Research Institute (EBRI)
Additional Information: This article has been published in a revised form in RSC Advances [http://doi.org/10.1557/adv.2018.347]. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. © copyright holder. Funding: Leverhulme Royal Society African Award and Mkwawa University College of Education (MUCE)
Uncontrolled Keywords: catalytic,heterogenous,mesoscale,porosity,sol-gel,Mechanical Engineering,Mechanics of Materials,Materials Science(all),Condensed Matter Physics
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.cam ... D15511F4A127DA8 (Publisher URL)
PURE Output Type: Article
Published Date: 2018-04-10
Published Online Date: 2018-04-10
Accepted Date: 2018-04-01
Authors: Elimbinzi, Elianaso
Nyandoro, Stephen S.
Mubofu, Egid B.
Osatiashtiani, Amin ( 0000-0003-1334-127X)
Manayil, Jinesh C. ( 0000-0002-9864-3332)
Isaacs, Mark A.
Lee, Adam F.
Wilson, Karen ( 0000-0003-4873-708X)

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