Abstract
Hydrodesulfurization (HDS) of straight run light gas oil (SRLGO) using novel highly active two-dimensional (2D) MoS2/graphene (G) nanohybrid catalysts is a precursor technology for the production of clean heavy fuel. The aim of this research is the synthesis of 2D MoS2/G nanohybrid catalysts by use of exfoliation method from commercial bulky MoS2 and graphite using hydrothermal ball milling system, which is a low-cost, high-yield, and scalable method. These nanohybrid catalysts were characterized by XRD, Raman spectroscopy, XPS, SEM, TEM, STEM, ICP, BET surface, TPR, and TPD techniques. Also, catalytic activities of 2D MoS2/G nanohybrid catalysts were evaluated under different operating conditions such as temperature, pressure, LHSV, and H2/Feed (SRLGO) ratio in the HDS reaction. The conversion of the HDS of SRLGO with 14000 ppm sulfur showed a considerably higher activity of 2D MoS2/G nanohybrid catalyst (99.95% HDS efficiency) compared with the Co-Mo/γAl2O3 as a commercial catalyst (90% HDS efficiency) in the operation condition (340 °C, 40 bars, LHSV: 1 h−1and H2/oil: 600 NL L−1) which is economically valuable. Using density functional theory calculations, the detailed mechanism of the HDS process over MoS2/G catalyst was explored. It was found that sulfur coverage on the Mo edge of MoS2 plays an important role in the hydrogenation of sulfur components.
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Zohal Safaei Mahmoudabadi: investigation, data curation, writing—original draft preparation. Alimorad Rashidi: supervision, conceptualization, methodology, validation, writing—reviewing and editing. Ahmad Tavsasoli: supervision. validation, writing—reviewing and editing, visualization, investigation. Mehdi Esrafili: investigation, data curation, writing—density functional theory calculations, and original draft preparation. All authors contributed to manuscript revisions. All authors approved the final version of the manuscript and agree to be held accountable for the content therein.
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Mahmoudabadi, Z.S., Tavasoli, A., Rashidi, A. et al. Catalytic activity of synthesized 2D MoS2/graphene nanohybrids for the hydrodesulfurization of SRLGO: experimental and DFT study. Environ Sci Pollut Res 28, 5978–5990 (2021). https://doi.org/10.1007/s11356-020-10889-8
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DOI: https://doi.org/10.1007/s11356-020-10889-8