Abstract
The world faces the challenge to produce ultra-low sulfur diesel with low-cost technology. Therefore, this research emphasised on production of low sulfur fuel utilising nanoparticle catalyst under mild condition. A small amount of cobalt oxide (10–30 wt%) was introduced into the Fe/Al2O3 catalyst through the wet impregnation method. Cobalt modification induces a positive effect on the performance of the iron catalyst. Hence, the insertion of cobalt species into Fe/Al2O3 led to the formation of lattice fringes in all directions which resulted in the formation of Co3O4 and Fe3O4 species. The optimised catalyst, Co/Fe–Al2O3, calcined at 400 °C with a dopant ratio of 10:90 indicating the highest desulfurisation activity by removing 96% of thiophene, 100% of dibenzothiophene (DBT) and 92% of 4,6-dimethyl dibenzothiophene (4,6-DMDBT). Based on the density functional theory (DFT) on Co/Fe–Al2O3, two pathways with the overall energy of −40.78 eV were suggested for the complete oxidation of DBT.














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Acknowledgements
The authors are grateful for the financial support by Ministry of Higher Education Malaysia through FRGS Grant under vot (203.PKIMIA.6711921) and Universiti Sains Malaysia (USM) for Short Term Grant (304/PKIMIA/6315052).
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Wan Nazwanie Wan Abdullah: conceptualisation, validation, supervision, funding acquisition
Nor Atiq Syakila Mohd Nazmi: resources; writing—original draft; investigation
Fazira Ilyana Abdul Razak: writing—review and editing; data curation
Wan Nur Aini Wan Mokhtar: writing—review and editing; data curation
Farook Adam: writing—review and editing; data curation
Mohamad Nasir Mohamad Ibrahim: writing—review and editing; data curation
Noorfatimah Yahaya: writing—review and editing; data curation
Nurasmat Mohd Shukri: writing—review and editing; data curation
Salmiah Jamal Mat Rosid: writing—review and editing; data curation
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Nazmi, .A.S.M., Razak, F.I.A., Mokhtar, W.N.A.W. et al. Catalytic oxidative desulfurisation over Co/Fe-γAl2O3 catalyst: performance, characterisation and computational study. Environ Sci Pollut Res 29, 1009–1020 (2022). https://doi.org/10.1007/s11356-021-15733-1
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DOI: https://doi.org/10.1007/s11356-021-15733-1


