Efficient deoxygenation of waste cooking oil over Co3O4-La2O3-doped activated carbon for the production of diesel-like fuel

Abdulkareem-Alsultan, G. and Asikin-Mijan, N. and Mustafa-Alsultan, G. and Lee, H.V. and Wilson, Karen and Taufiq-Yap, Y. H. (2020) Efficient deoxygenation of waste cooking oil over Co3O4-La2O3-doped activated carbon for the production of diesel-like fuel. RSC Advances, 10 (9). pp. 4996-5009. ISSN 2046-2069, DOI https://doi.org/10.1039/c9ra09516k.

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Untreated waste cooking oil (WCO) with significant levels of water and fatty acids (FFAs) was deoxygenated over Co3O4-La2O3/AC(nano) catalysts under an inert flow of N-2 in a micro-batch closed system for the production of green diesel. The primary reaction mechanism was found to be the decarbonylation/decarboxylation (deCOx) pathway in the Co3O4-La2O3/AC(nano)-catalyzed reaction. The effect of cobalt doping, catalyst loading, different deoxygenation (DO) systems, temperature and time were investigated. The results indicated that among the various cobalt doping levels (between 5 and 25 wt%), the maximum catalytic activity was exhibited with the Co:La ratio of 20:20 wt/wt% DO under N-2 flow, which yielded 58% hydrocarbons with majority diesel-range (n-(C-15 + C-17)) selectivity (similar to 63%), using 3 wt% catalyst loading at a temperature of 350 degrees C within 180 min. Interestingly, 1 wt% of catalyst in the micro-batch closed system yielded 96% hydrocarbons with 93% n-(C-15 + C-17) selectivity within 60 min at 330 degrees C, 38.4 wt% FFA and 5% water content. An examination of the WCO under a series of FFA (0-20%) and water contents (0.5-20 wt%) indicated an enhanced yield of green diesel, and increased involvement of the deCOx mechanism. A high water content was found to increase the decomposition of triglycerides into FFAs and promote the DO reaction. The present work demonstrates that WCO with significant levels of water and FFAs generated by the food industry can provide an economical and naturally replenished raw material for the production of diesel.

Item Type: Article
Funders: Ministry of Education, Malaysia (FRGS 2014-1), Ministry of Education, Malaysia (UPM/8003/3/1/GPB/2018/9658700), Ministry of Education, Malaysia (GBP/2019/9674500)
Uncontrolled Keywords: Catalytic deoxygenation; Green diesel; Supported Ni; Nickel; Selectivity; Hydrogen; Toluene; Acid; Transesterification; Hydrodeoxygenation
Subjects: Q Science > QD Chemistry
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre
Depositing User: Ms Zaharah Ramly
Date Deposited: 15 Dec 2022 09:51
Last Modified: 15 Dec 2022 09:51
URI: http://eprints.um.edu.my/id/eprint/37898

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