Effect of operating parameters on the selective catalytic deoxygenation of palm oil to produce renewable diesel over Ni supported on Al2O3, ZrO2 and SiO2 catalysts
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Papageridis, K.N, Charisiou, N.D, Douvartzides, S.L, Sebastian, V., Hinder, S.J, Baker, M.A, AlKhoori, S., Polychronopoulou, K. and Goula, M.A (2020) Effect of operating parameters on the selective catalytic deoxygenation of palm oil to produce renewable diesel over Ni supported on Al2O3, ZrO2 and SiO2 catalysts Fuel Processing Technology.
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Abstract
The present work investigated the production of Green Diesel through the deoxygenation of palm oil over Ni catalysts supported on γ-Αl2O3, ZrO2 and SiO2 for a continuous flow fixed bed reactor. A comprehensive experimental study was carried out in order to examine the effects of temperature, pressure, LHSV and H2/oil feed ratio on catalytic activity during short (6 h) and long (20 h) time-on-stream experiments. The catalysts were prepared through the wet impregnation method (8 wt.% Ni) and were extensively characterized by N2 adsorption/desorption, XRD, NH3-TPD, CO2-TPD, H2-TPD, H2-TPR, XPS, TEM/HR-TEM and Raman. The characterization of the materials prior to reaction revealed that although relatively small Ni nanoparticles were achieved for all catalysts (4.3 ± 1.6 nm, 6.1 ± 1.8 nm and 6.0 ± 1.8 nm for the Ni/Al2O3, Ni/ZrO2 and Ni/SiO2 catalysts, respectively), NiO was better dispersed on the Ni/ZrO2 catalyst, while the opposite was true for the Ni/SiO2 sample. In the case of Ni/Al2O3, part of Ni could not participate in the reaction due to its entrapment in the NiAl2O4 spinel phase. Regarding performance, although an increase in H2 pressure led to increases in paraffin conversion, the increase of temperature was beneficial only up to a critical value which differed for each catalytic system under consideration (375 oC, 300 oC and 350 oC for the Ni/Al2O3, Ni/ZrO2 and Ni/SiO2 catalysts, respectively). All catalysts favored the deCO2 and deCO deoxygenation paths much more extensively than HDO, irrespective of testing conditions. Time-on-stream experiments showed that all catalysts deactivated after about 6 h, which was attributed to the sintering of the Ni particles and/or their covering by a thin graphitic carbon shell.
| Item Type: | Article | ||||||||||||||||||||||||||||||
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| Divisions : | Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences | ||||||||||||||||||||||||||||||
| Authors : |
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| Date : | 24 July 2020 | ||||||||||||||||||||||||||||||
| Funders : | Hellenic Foundation for Research and Innovation, General Secretariat for Research and Technology, European Social Fund, Research Committee of the University of Western Macedonia, Abu Dhabi Department of Education and Knowledge, Khalifa University | ||||||||||||||||||||||||||||||
| Grant Title : | HFRI PhD Fellowship grant | ||||||||||||||||||||||||||||||
| Additional Information : | Embargo OK Metadata Pending | ||||||||||||||||||||||||||||||
| Depositing User : | James Marshall | ||||||||||||||||||||||||||||||
| Date Deposited : | 31 Jul 2020 14:35 | ||||||||||||||||||||||||||||||
| Last Modified : | 31 Jul 2020 14:35 | ||||||||||||||||||||||||||||||
| URI: | http://epubs.surrey.ac.uk/id/eprint/858334 |
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