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Geochemical characteristics of oil sands fluid petroleum coke

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dc.contributor.authorNesbitt, Jake A.
dc.contributor.authorLindsay, Matthew B. J.
dc.contributor.authorchen, ning
dc.date.accessioned2022-10-26T16:32:37Z
dc.date.available2022-10-26T16:32:37Z
dc.date.issued2016-11-30
dc.descriptionCopyright © 2016 Elsevier Ltd. All rights reserved.en_US
dc.description.abstractThe geochemical characteristics of fluid petroleum coke from an oil sands mine in the Athabasca Oil Sands Region (AOSR) of northern Alberta, Canada were investigated. Continuous core samples were collected to 8 m below surface at several locations (n = 12) from three coke deposits at an active oil sands mine. Bulk elemental analyses revealed the coke composition was dominated by C (84.2 ± 2.3 wt. %) and S (6.99 ± 0.26 wt. %). Silicon (9210 ± 3000 mg kg−1), Al (5980 ± 1200 mg kg−1), Fe (4760 ± 1200 mg kg−1), and Ti (1380 ± 430 mg kg−1) were present in lesser amounts. Vanadium (1280 ± 120 mg kg−1) and Ni (230 ± 80 mg kg−1) occurred at the highest concentrations among potentially-hazardous minor and trace elements. Sequential extractions revealed potential for release of these elements under field-relevant conditions. Synchrotron powder X-ray diffraction revealed the presence of Si and Ti oxides, organically-complexed V and hydrated Ni sulfate, and provided information about the aromatic carbon matrix. X-ray absorption near edge structure (XANES) spectroscopy at the V and Ni K-edges revealed that these metals were largely hosted in porphyrins and similar organic complexes throughout coke grains. Slight variations among V and Ni K-edge spectra were largely attributed to slight variations in local coordination of V(IV) and Ni(II) within these organic compounds. However, linear combination fits were improved by including reference spectra for phases with octahedrally-coordinated V(III) and Ni(II). Sulfur and Fe K-edge XANES confirmed that thiophenic coordination and pyritic-ilmenitic coordination are predominant, respectively. These results provide new information on the geochemical and mineralogical composition of oil sands fluid petroleum coke and improve understanding of potential controls on associated water chemistry.en_US
dc.description.sponsorshipFunding was provided by the Natural Sciences and Engineering Council of Canada (NSERC) and Syncrude Canada Ltd. to MBJL through the Industrial Research Chairs program (Grant No. IRCPJ 450684-13). Additional support for JAN was provided through the SRK Canada Graduate Scholarship Program and the NSERC – Toward Environmentally Responsible Resource Extraction – Collaborative Research and Training Experience (NSERC-TERRE-CREATE) program (Grant No. CREAT 449124-2014). A portion of this research described was performed at the Canadian Light Source, which is supported by the Canada Foundation for Innovation, NSERC, the University of Saskatchewan, the Government of Saskatchewan, Western Economic Diversification Canada, the National Research Council Canada, and the Canadian Institutes of Health Research.en_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationNesbitt, J.A., Lindsay, M.B.J. & Chen, N. (2017). Geochemical characteristics of oil sands fluid petroleum coke. Applied Geochemistry, 76: 148–158. https://doi.org/10.1016/j.apgeochem.2016.11.023en_US
dc.identifier.doi10.1016/j.apgeochem.2016.11.023
dc.identifier.urihttps://hdl.handle.net/10388/14272
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.rightsAttribution-NonCommercial-NoDerivs 2.5 Canada*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ca/*
dc.subjectpetroleum cokeen_US
dc.subjectoil sandsen_US
dc.subjectgeochemistryen_US
dc.subjectmineralogyen_US
dc.subjecttrace elementsen_US
dc.subjectX-ray absorption spectroscopyen_US
dc.titleGeochemical characteristics of oil sands fluid petroleum cokeen_US
dc.typeArticleen_US

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