Academic Journal
Hydroprocessing of Maya vacuum residue using a NiMo catalyst supported on Cr-doped alumina
| العنوان: | Hydroprocessing of Maya vacuum residue using a NiMo catalyst supported on Cr-doped alumina |
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| المؤلفون: | Purón, Holda, Pinilla Ibarz, José Luis, Saraev, Andrey A., Kaichev, Vasily V., Millán, Marcos |
| المساهمون: | Consejo Nacional de Ciencia y Tecnología (México), Pinilla Ibarz, José Luis, Saraev, Andrey A., Kaichev, Vasily V., Millan, Marcos |
| بيانات النشر: | Elsevier |
| سنة النشر: | 2019 |
| المجموعة: | Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| مصطلحات موضوعية: | Hydroprocessing, Vacuum residue, Cr-doped alumina, NiMo catalyst, Asphaltenes, Hydrocracking |
| الوصف: | 6 figures, 7 tables.-- © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ ; Mesoporous alumina was doped with Cr using a co-precipitation method to prepare a support for hydrocracking catalysts. Ni and Mo were then impregnated on Cr-doped mesoporous alumina (NiMo/Al2O3-Cr). Catalytic activity was tested in hydrodeasphaltenisation (HDA), hydrodesulfurisation (HDS) and hydrodemetallisation (HDM) of Maya vacuum residue in a batch reactor and compared with NiMo supported on mesoporous alumina not doped with Cr (NiMo/Al2O3). Following activation and initial carbon deposition, experiments involving contact of the catalysts with fresh feed were performed. Greater HDA extent and maltene to asphaltene ratios were obtained with NiMo/Al2O3-Cr than NiMo/Al2O3 despite a larger amount of coke deposits. Significant activity of both NiMo/Al2O3-Cr and NiMo/Al2O3 towards HDS and HDM were also observed. Alumina textural properties remained relatively unaffected by the co-precipitation of Cr. X-ray photoelectron spectroscopy (XPS) showed that the catalysts contained Cr3+ and after reduction all Ni was present in metallic state at least in the near-surface region, while Mo6+ was reduced to Mo4+ and Moδ+ (0 ≤ δ ≤ 3) to a larger extent in NiMo/Al2O3-Cr. Lower reduction temperatures in the presence of Cr were determined, suggesting a larger number of metal sites available in reduced form at operating conditions. It was found that Cr aided metal dispersion in catalyst synthesis and coke dispersion during reaction. Spent catalysts showed reductions in surface area and pore volume. However, while spent NiMo/Al2O3 catalysts had a decrease in average pore diameter (APD), NiMo/Al2O3-Cr maintained the fresh material APD, which may explain the sustained catalytic activity. ; H.P. thanks the support of CONACYT Mexico for the award of her PhD grant. Founding from Skolkovo Foundation and BP through UNIHEAT Project is gratefully acknowledged. ; Peer reviewed |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0016-2361 1873-7153 |
| Relation: | Postprint; http://dx.doi.org/10.1016/j.fuel.2019.116717; Sí; Fuel 263: 116717 (2020); http://hdl.handle.net/10261/203488; http://dx.doi.org/10.13039/501100003141 |
| DOI: | 10.1016/j.fuel.2019.116717 |
| DOI: | 10.13039/501100003141 |
| الاتاحة: | http://hdl.handle.net/10261/203488 https://doi.org/10.1016/j.fuel.2019.116717 https://doi.org/10.13039/501100003141 |
| Rights: | open |
| رقم الانضمام: | edsbas.4D0E18DD |
| قاعدة البيانات: | BASE |
| تدمد: | 00162361 18737153 |
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| DOI: | 10.1016/j.fuel.2019.116717 |