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Synthesis and Performance of Sulfated Zirconia Catalyst in Esterification of Oleic Acid

Universidad Politécnica de Chiapas, Eduardo J. Selvas, 29082, Tuxtla Gutiérrez, Chiapas, México

Centro de Investigación en Materiales Avanzados S.C., Ave. Miguel de Cervantes 120, 31109, Chihuahua, México

Instituto de Energías Renovables – UNAM, 62580, Temixco, Morelos, México

Instituto de Biotecnologia-UNAM, Av. Universidad 2001, Cuernavaca, 62210, Morelos, Mexico

Corresponding Author Email:

sjp@ier.unam.mx

Received:

September 17, 2013

| |

Accepted:

November 15, 2013

| | Citation

430-article_text-698-1-10-20170726.pdf

OPEN ACCESS

Abstract:

In this work, the performance of sulfated zirconia catalyst used in the synthesis of biodiesel by esterification of oleic acid was studied. For catalyst preparation the zirconium dioxide (ZrO) by Aldrich was used as precursor. The sulfated zirconia obtained was calcined for 3 hours at different temperatures (200, 400, 600 and 700 °C) in an oxygen atmosphere. Each of the calcination conditions generated a sample of catalyst, which was used in the esterification reaction. The esterification reaction was carried out using reagents such as oleic acid and methanol at a molar ratio 1:20. The sulfated zirconia catalyst was used in the reaction in various proportions by weight relative to the weight of oleic acid (0.5, 1.0, 3.0 and 5%). The analysis of methyl ester conversion was performed by gas chromatography and mass spectrometry (CGMS) and the percentage area of the characteristic peaks as methyl oleate was quantified. A characterization of sulfated zirconia was also performed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Finally, the catalyst performance was studied in the reduction of the acid index (AI) and the conversion of free fatty acids of oleic acid and compared to other commonly used catalyst for this purpose, which is concentrated sulfuric acid (H₂SO₄).

Keywords:

sulfated zirconia, oleic acid, biodiesel, esterification, transesterification

1. Introduction

2. Materials and Methods

3. Results and Discussion

4. Conclusions

5. Acknowledgement

The authors acknowledge the economic support from National Council for Science and Technology of Mexico (CONACYT).

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Synthesis and Performance of Sulfated Zirconia Catalyst in Esterification of Oleic Acid