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Environment-friendly deoxygenation of non-edible Ceiba oil to liquid hydrocarbon biofuel: process parameters and optimization study

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Abstract

Non-edible Ceiba oil has the potential to be a sustainable biofuel resource in tropical countries that can replace a portion of today’s fossil fuels. Catalytic deoxygenation of the Ceiba oil (high O/C ratio) was conducted to produce hydrocarbon biofuel (high H/C ratio) over NiO-CaO5/SiO2-Al2O3 catalyst with aims of high diesel selectivity and catalyst reusability. In the present study, response surface methodology (RSM) technique with Box-Behnken experimental designs (BBD) was used to evaluate and optimize liquid hydrocarbon yield by considering the following deoxygenation parameters: catalyst loading (1–9 wt. %), reaction temperature (300–380 °C) and reaction time (30–180 min). According to the RSM results, the maximum yield for liquid hydrocarbon n-(C8–C20) was found to be 77% at 340 °C within 105 min and 5 wt. % catalyst loading. In addition, the deoxygenation model showed that the catalyst loading-reaction time interaction has a major impact on the deoxygenation activity. Based on the product analysis, oxygenated species from Ceiba oil were successfully removed in the form of CO2/CO via decarboxylation/decarbonylation (deCOx) pathways. The NiO-CaO5/SiO2-Al2O3 catalyst rendered stable reusability for five consecutive runs with liquid hydrocarbon yield within the range of 66–75% with n-(C15 + C17) selectivity of 64–72%. Despite this, coke deposition was observed after several times of catalyst usage, which is due to the high deoxygenation temperature (> 300 °C) that resulted in unfavourable polymerization side reaction.

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The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors wish to express their gratitude to research officers from chemical catalysis lab, NANOCAT (Universiti Malaya) and PUTRACAT (Universiti Putra Malaysia) for technical assistance and laboratory facilities.

Funding

The sources of funding provided by University of Malaya MOHE-Top 100 (IIRG)-IISS (IIRG002A-2020IISS), SATU Joint Research Scheme RU Grants (project number: ST026-2021) and Geran Galakan Penyelidik Muda (GGPM) 2020–15 were used for the purpose of design of the study and collection, analysis and interpretation of data and in writing the manuscript.

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NHBA conducted experimental work, investigation, data validation and writing-original draft of manuscript. NAM involved in conceptualization of study and manuscript writing, review and editing. YHTY provide resources, research facilities and manuscript writing and review and editing. HCO take role in manuscript writing, review and editing and resources supply. HVL involved in supervision, funding acquisition, project administration, and manuscript writing and review and editing. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Hwai Chyuan Ong or Hwei Voon Lee.

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The authors declare no competing interests.

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Responsible Editor: Ta Yeong Wu

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Abdullah, N.H.B., Mijan, N.A., Taufiq-Yap, Y.H. et al. Environment-friendly deoxygenation of non-edible Ceiba oil to liquid hydrocarbon biofuel: process parameters and optimization study. Environ Sci Pollut Res 29, 51143–51152 (2022). https://doi.org/10.1007/s11356-022-18508-4

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  • DOI: https://doi.org/10.1007/s11356-022-18508-4

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