Heavy oil viscosity reduction at mild temperatures using palladium acetylacetonate

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dc.citation.articleNumber120546en_US
dc.citation.journalTitleFuelen_US
dc.citation.volumeNumber294en_US
dc.contributor.authorXu, Yanen_US
dc.contributor.authorHeck, Kimberly N.en_US
dc.contributor.authorAyala-Orozco, Ciceronen_US
dc.contributor.authorArredondo, Jacob H.en_US
dc.contributor.authorZenor, Williamen_US
dc.contributor.authorShammai, Michaelen_US
dc.contributor.authorWong, Michael S.en_US
dc.date.accessioned2021-04-05T18:40:00Zen_US
dc.date.available2021-04-05T18:40:00Zen_US
dc.date.issued2021en_US
dc.description.abstractMetal-ligand compounds (“MLCs”) have been shown to reduce heavy oil viscosity and upgrade oil quality. However, MLCs generally require high treatment temperatures (around 250 °C), which is undesirably energy-intensive. We identified palladium(II) acetylacetonate (“PdA”) as a model MLC that can operate at mild temperatures (<200 °C). We studied its effectiveness on heavy oil viscosity reduction in the range of 80–300 °C using viscometry, SARA analysis, GC–MS, XPS, and XRD to characterize Peace River oil samples thermally treated with and without PdA. This MLC effectively lowered oil viscosity at all treatment temperatures, whereas thermal-only treatments did not reduce viscosity below 160 °C. The thermal treatment with PdA in the 130–250 °C range reduced viscosity by up to ~35% more than the thermal treatment alone. GC–MS and TGA results indicated the PdA partially decomposed at 80 °C and higher temperatures, releasing acetylacetone (“HA”), which lowered oil viscosity. The temperature and HA effects did not completely account for the observed viscosity reduction from thermal treatment with PdA, indicating there were other significant effects. In the 80–130 °C range, the asphaltene fraction increased due to PdA or its decomposition products intercalating into the asphaltene clusters. At temperatures around 250 °C, the resin fraction decreased, correlating to in situ formed metallic Pd that catalytically hydrogenate the resin sulfonyl groups to aliphatic sulfur. This new understanding of the temperature-dependent impact – acetylacetonate ligand, MLC-asphaltene attraction, and palladium metal catalyst formation – on oil viscosity changes provides an improved approach to developing new MLCs for field-relevant conditions.en_US
dc.identifier.citationXu, Yan, Heck, Kimberly N., Ayala-Orozco, Ciceron, et al.. "Heavy oil viscosity reduction at mild temperatures using palladium acetylacetonate." <i>Fuel,</i> 294, (2021) Elsevier: https://doi.org/10.1016/j.fuel.2021.120546.en_US
dc.identifier.doihttps://doi.org/10.1016/j.fuel.2021.120546en_US
dc.identifier.urihttps://hdl.handle.net/1911/110205en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Elsevier.en_US
dc.subject.keywordHeavy oilen_US
dc.subject.keywordpalladium (II) acetylacetonateen_US
dc.subject.keywordMild temperature viscosity reductionen_US
dc.subject.keywordAsphaltenes intercalationen_US
dc.subject.keywordCatalytic hydrogenationen_US
dc.subject.keywordMetal-ligand compoundsen_US
dc.titleHeavy oil viscosity reduction at mild temperatures using palladium acetylacetonateen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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