Abstract
Commercial liquid-phase-sulfided type II CoMo/Al2O3 catalyst was reactivated after commercial operation and oxidative regeneration. For this purpose, the use of citric acid (CA) that reactivates a regenerated CoMo/Al2O3 catalyst was studied. The study of the reactivated catalyst was carried out by means of UV-DRS, FTIR, Raman spectroscopy, XRD, XPS, and HTREM. The catalytic activity was estimated in the HDS of straight-run gasoil (SRGO). It was shown that the treatment of the catalyst with CA leads to the formation of a Co–Mo complex compound and significantly reduces the proportion of β-CoMoO4 and MoO3 in the catalyst. Eventually, this leads to the formation of CoMoS phase type II in a higher proportion enhancing the HDS catalytic properties.
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Abbreviations
- UV-DRS:
-
Ultra-violet diffuse reflectance spectroscopy
- XRD:
-
X-ray diffraction
- FTIR:
-
Fourier transform infrared spectroscopy
- XPS:
-
X-ray photoelectron spectroscopy
- HRTEM:
-
High-resolution transmission electron microscopy
- BE:
-
Binding energy
- CA:
-
Citric acid
- HDS:
-
Hydrodesulfurization
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Acknowledgements
This work was conducted within the framework of the budget project АААА-А17-117041710077-4 for Boreskov Institute of Catalysis.
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Budukva, S.V., Klimov, O.V., Chesalov, Y.A. et al. Reactivation of CoMo/Al2O3 Hydrotreating Catalysts by Citric Acid. Catal Lett 148, 1525–1534 (2018). https://doi.org/10.1007/s10562-018-2365-9
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DOI: https://doi.org/10.1007/s10562-018-2365-9