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Issue 24, 2019
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The direct synthesis of a bio-lubricant by the oligomerization of methyllinoleate via castor oil

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Abstract

Lubricating oil is one of the important types of petrochemical products widely used in industry. However, traditional petroleum-based lubricants, which are associated with exhausting fossil resources, pose a great hazard to the environment owing to their non-degradability. Castor oil, as a type of vegetable oil, is a promising candidate to replace mineral oil to alleviate energy stress and protect the environment. Herein, we report a novel strategy for developing a non-noble metal catalyst for the oligomerization of methyllinoleate to directly produce bio-lubricant oil. The obtained dimers and higher oligomers of methyllinoleate were produced with a high conversion of 99.9% and a maximum yield of 70.8% using a molybdenum-containing silica–alumina catalyst under optimised conditions. The superior activity was attributed to the highly dispersed MoO3 nanoparticles on the surface of the silica–alumina support. The polymerization mechanism of the Mo-based catalyst for this eco-friendly oligomerization process was proposed and verified using density functional theory (DFT) calculations to provide a better understanding of the catalytic mechanism.

Graphical abstract: The direct synthesis of a bio-lubricant by the oligomerization of methyllinoleate via castor oil

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Article information


Submitted
17 Sep 2019
Accepted
06 Nov 2019
First published
20 Nov 2019

Green Chem., 2019,21, 6658-6666
Article type
Paper

The direct synthesis of a bio-lubricant by the oligomerization of methyllinoleate via castor oil

W. Xue, L. Shi, X. Chen, M. Qiu, C. Zhou, H. Liu, S. Li and Y. Sun, Green Chem., 2019, 21, 6658
DOI: 10.1039/C9GC03257F

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