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Oxidation and thermal stability analysis of hexadecyl mercaptan added to engine oil

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Abstract

This research mainly involves the oxidation stability and thermal stability tests of commercially available 10W50 engine oil after adding organic sulfide, here hexadecyl mercaptan (C16H34S), as an additive. First, differential scanning calorimetry was applied to evaluate the oxidation induction time (OIT). Second, thermogravimetry was adopted for isothermal thermogravimetric analysis. Then kinematic viscosity was tested to calculate the viscosity index. According to the results, the sample with the optimal addition ratio was selected, and the crude oil was subjected to follow-up experiments. Thermogravimetry was utilized to perform kinematic heating thermogravimetric analysis with the thermokinetic model and to calculate the apparent activation energy. Based on the characteristic analysis of modified engine oil, it was found that hexadecyl mercaptan as a lubricant additive can effectively ameliorate its oxidation stability and obtain extended oxidation time. Among them, the sample added with 3.0 mass% additive was the optimal addition ratio and its OIT was extended to 33 min. Thermal stability was also significantly improved. Ea was increased by ca. 20 kJ mol–1.

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Acknowledgements

The authors thank all members of the Process Safety and Disaster Prevention Laboratory for the experimental support and are especially grateful to the outstanding members of thermal analysis groups for suggestions and inspiration for this research.

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Authors and Affiliations

  1. Department of Safety, Health, and Environmental Engineering, National Yunlin University of Science and Technology (YunTech), 123, University Rd., Sec. 3, Douliou, Yunlin, 64002, Taiwan, ROC

    Rong-Yu Chen, Pei-Hsuan Tung & Chi-Min Shu

  2. Graduate School of Engineering Science and Technology, YunTech, 123, University RdSec. 3, Douliou, Yunlin, 64002, Taiwan, ROC

    Bin Laiwang

  3. Department of Safety, Health, and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 81164, Taiwan, ROC

    Horng-Jang Liaw

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  1. Rong-Yu Chen
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  2. Pei-Hsuan Tung
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  5. Chi-Min Shu
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Correspondence to Chi-Min Shu.

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Chen, RY., Tung, PH., Laiwang, B. et al. Oxidation and thermal stability analysis of hexadecyl mercaptan added to engine oil. J Therm Anal Calorim 147, 4685–4696 (2022). https://doi.org/10.1007/s10973-021-10792-5

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  • DOI: https://doi.org/10.1007/s10973-021-10792-5

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