Catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material

This research focuses on the synthesis and characterization of metalcontaining mesoporous silica for catalytic esterification of benzyl alcohol with acetic acid. In this study Zr-containing MCM-41 (Zr-MCM-41) with different molar ratios were synthesized successfully, and the influence of the Si/Zr m...

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Main Author:	Jazi, Mehdi Erfani
Format:	Thesis
Language:	English
Published:	2010
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/11353/1/MehdiErfaniJaziMFS2010.pdf
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spelling	my-utm-ep.113532017-10-29T03:49:29Z Catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material 2010-03 Jazi, Mehdi Erfani QD Chemistry This research focuses on the synthesis and characterization of metalcontaining mesoporous silica for catalytic esterification of benzyl alcohol with acetic acid. In this study Zr-containing MCM-41 (Zr-MCM-41) with different molar ratios were synthesized successfully, and the influence of the Si/Zr molar ratio on the crystalline structure, textural properties, morphological features and surface acidity of Zr-MCM-41 mesoporous molecular sieves was investigated by X-ray diffraction (XRD), N2 adsorption-desorption measurement, SEM and FTIR (Fourier transform infrared) Spectroscopy, UV-Vis diffuse reflectance (UV-Vis DR), spectroscopy and single point BET. It is observed that the structural ordering of Zr-MCM-41 varies with the Si/Zr ratio, and highly ordered mesoporous molecular sieves could be earned for a Si/Zr molar ratio larger than 5. Calcination may significantly improve the structural regularity. After impregnation with 15 wt % of H3PW12O40 (denoted as HWP hereafter),in esterification reaction of benzyl alcohol with acetic acid, the benzyl alcohol conversion over all the HPW/Zr-MCM-41catalysts linearly increases with increasing the reaction temperature, and selectivity to benzyl acetate was 100 %. The molar ratios of reactants also were investigated for final product yield; the molar ratio of acetic acid to benzyl alcohol can be 2:1 for high yield. The presence of zirconium in tetrahedral coordination was indicated by UV-Vis DR spectra, which shows an absorption band around 220 nm in Zr-MCM41. The catalyst had more active sites than pure Si-MCM-41 due to enhanced hydrophobicity properties and the presence of framework zirconium species as Lewis active sites. Kinetics studies have shown that the esterification reaction follows the Eley-Ridel mechanism. The energy of activation for the reaction follows the order: HPW/Zr-MCM-41(Si/Zr=5) > Zr- MCM-41(Si/Zr=10) > Zr-MCM-41(Si/Zr=20). 2010-03 Thesis http://eprints.utm.my/id/eprint/11353/ http://eprints.utm.my/id/eprint/11353/1/MehdiErfaniJaziMFS2010.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Jazi, Mehdi Erfani Catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material
description	This research focuses on the synthesis and characterization of metalcontaining mesoporous silica for catalytic esterification of benzyl alcohol with acetic acid. In this study Zr-containing MCM-41 (Zr-MCM-41) with different molar ratios were synthesized successfully, and the influence of the Si/Zr molar ratio on the crystalline structure, textural properties, morphological features and surface acidity of Zr-MCM-41 mesoporous molecular sieves was investigated by X-ray diffraction (XRD), N2 adsorption-desorption measurement, SEM and FTIR (Fourier transform infrared) Spectroscopy, UV-Vis diffuse reflectance (UV-Vis DR), spectroscopy and single point BET. It is observed that the structural ordering of Zr-MCM-41 varies with the Si/Zr ratio, and highly ordered mesoporous molecular sieves could be earned for a Si/Zr molar ratio larger than 5. Calcination may significantly improve the structural regularity. After impregnation with 15 wt % of H3PW12O40 (denoted as HWP hereafter),in esterification reaction of benzyl alcohol with acetic acid, the benzyl alcohol conversion over all the HPW/Zr-MCM-41catalysts linearly increases with increasing the reaction temperature, and selectivity to benzyl acetate was 100 %. The molar ratios of reactants also were investigated for final product yield; the molar ratio of acetic acid to benzyl alcohol can be 2:1 for high yield. The presence of zirconium in tetrahedral coordination was indicated by UV-Vis DR spectra, which shows an absorption band around 220 nm in Zr-MCM41. The catalyst had more active sites than pure Si-MCM-41 due to enhanced hydrophobicity properties and the presence of framework zirconium species as Lewis active sites. Kinetics studies have shown that the esterification reaction follows the Eley-Ridel mechanism. The energy of activation for the reaction follows the order: HPW/Zr-MCM-41(Si/Zr=5) > Zr- MCM-41(Si/Zr=10) > Zr-MCM-41(Si/Zr=20).
format	Thesis
qualification_level	Master's degree
author	Jazi, Mehdi Erfani
author_facet	Jazi, Mehdi Erfani
author_sort	Jazi, Mehdi Erfani
title	Catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material
title_short	Catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material
title_full	Catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material
title_fullStr	Catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material
title_full_unstemmed	Catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material
title_sort	catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2010
url	http://eprints.utm.my/id/eprint/11353/1/MehdiErfaniJaziMFS2010.pdf
_version_	1747814842877607936

Catalytic esterification of benzyl alcohol with acetic acid by zirconia-loaded on mesoporous material

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