Preparation of a novel solid acid catalyst SO42-/Nd2O3/C and study of its performance for the synthesis of biodiesel from esterification reaction of oleic acid and methanol

SHU Qing; HOU Xiao-peng; ZHU Li-hua; SHEN Bang-po; MA Fei; WANG Jin-fu

Feb 2016

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JOURNAL OF MECHANICAL ENGINEERING > 2016 > 44(2): 209-216.

SHU Qing, HOU Xiao-peng, ZHU Li-hua, SHEN Bang-po, MA Fei, WANG Jin-fu. Preparation of a novel solid acid catalyst SO42-/Nd2O3/C and study of its performance for the synthesis of biodiesel from esterification reaction of oleic acid and methanol[J]. JOURNAL OF MECHANICAL ENGINEERING, 2016, 44(2): 209-216.

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SHU Qing, HOU Xiao-peng, ZHU Li-hua, SHEN Bang-po, MA Fei, WANG Jin-fu. Preparation of a novel solid acid catalyst SO₄^2-/Nd₂O₃/C and study of its performance for the synthesis of biodiesel from esterification reaction of oleic acid and methanol[J]. JOURNAL OF MECHANICAL ENGINEERING, 2016, 44(2): 209-216.

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Preparation of a novel solid acid catalyst SO₄^2-/Nd₂O₃/C and study of its performance for the synthesis of biodiesel from esterification reaction of oleic acid and methanol

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Corresponding author: Tel: 15216127106, E-mail: shuqing@tsinghua.org.cn
Received Date: 17 Sep 2015
Rev Recd Date: 26 Nov 2015

Abstract

Abstract

A carbon material was prepared from the high temperature carbonization of waste camellia seed shell in a fluidized bed tubular reactor.The carbon material was applied as the catalyst support to prepare a new catalyst SO₄^2-/Nd₂O₃/C after it was simultaneously modified by Nd³⁺ and sulfonated by concentrated sulfuric acid through impregnation method.The catalyst was characterized by several physical and chemical characterization methods.The catalytic activity and reusability of SO₄^2-/Nd₂O₃/C were evaluated using it to catalyze the esterification of methanol and oleic acid for the synthesis of biodiesel.Results showed that the conversion of oleic acid was 96.70% when the methanol/oleic acid molar ratio was 2:1, reaction temperature was 90℃, and catalyst/reactants was 2% under reflux condensation for 120 min.After recycling of three times, the conversion of oleic acid was still 86.74%.High activity can be explained as follows:the electro-negativity of Nd is 1.14, which is smaller than O (3.44) and S (2.58), so it will provide lone electron pair to the empty 2p orbit of O and S, resulting in the formation of a stable coordination bond between Nd³⁺ and SO₄^2-.In addition, S=O double bond can induce a strong electron withdrawing effect, which can increase the electrostatic field of Nd³⁺ when it was coordinated with SO₄^2-.And finally, it should be noticed that H₂O is a strong ligand.Hence, SO₄^2-/Nd₂O₃/C exhibited a strong Br nsted acidity when H₂O existed in the reaction medium.
- biodiesel,
- Nd³⁺ and sulfuric acid modification,
- carbon-based solid acid,
- esterification,
- coordination bond

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Preparation of a novel solid acid catalyst SO₄^2-/Nd₂O₃/C and study of its performance for the synthesis of biodiesel from esterification reaction of oleic acid and methanol

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Preparation of a novel solid acid catalyst SO₄^2-/Nd₂O₃/C and study of its performance for the synthesis of biodiesel from esterification reaction of oleic acid and methanol