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Use of HZSM-5 modified with citric acid as acid heterogeneous catalyst for biodiesel production via esterification of oleic acid

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Jan 2015 Brazil Publisher:Elsevier BVJournal:Microporous and Mesoporous Materials, volume 201, pages 160-168 (issn: 1387-1811,

Authors: Zuy M. Magriotis; Sabrina Mesquita Coelho; Auguste Fernandes; Maria Filipa Ribeiro; Nadiene A.V. Santos; Adelir Ap. Saczk; Sara S. Vieira; +2 Authors

doi: 10.1016/j.micromeso.2014.09.015

Use of HZSM-5 modified with citric acid as acid heterogeneous catalyst for biodiesel production via esterification of oleic acid

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Abstract

Abstract In this study, the efficiency of citric acid as dealumination agent was evaluated in the case of zeolite HZSM-5 by varying the experimental conditions, namely concentration (0.5, 1.0 and 2.0 mol L−1) and treatment temperature (60 and 80 °C). The effect of the CA treatment on structural, textural and acidity properties of the starting HZSM-5 material was monitored using XRD, N2 sorption and FTIR (pyridine and collidine) measurements. Heptane and methylcyclohexane cracking model reactions were used to evaluate the catalytic behavior of the modified materials, in terms of acid strength and active sites accessibility. The modified catalysts were tested in the esterification reaction, using oleic acid as reagent and different oleic acid/methanol molar ratios. All the results show the beneficial effect of the citric acid treatment on the physicochemical properties of the final materials, with an improvement of the external acidity, a crucial parameter for the reaction considered, i.e. the oleic acid esterification.

Country

Brazil

Related Organizations

University of Lisbon
Portugal
Federal University of Lavras
Brazil
Institute for Biotechnology and Bioengineering
Portugal
Instituto Superior de Espinho
Portugal

Keywords

Zeolite, Esterification, Citric acid, HZSM-5, Biodiesel, Dealumination

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