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<div class="csl-entry">Pichler, J., Eder, R. M., Widder, L., Varga, M., Marchetti-Deschmann, M., & Frauscher, M. (2023). Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil. <i>Green Chemistry Letters and Reviews</i>, <i>16</i>(1), Article 2215243. https://doi.org/10.1080/17518253.2023.2215243</div>
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dc.identifier.issn
1751-8253
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/192249
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dc.description.abstract
With the EU aiming for net-zero greenhouse gas emissions by 2050, conventional production cycles must be transformed into cradle-to-cradle approaches. Spent coffee grounds are often dumped in landfills, with their potential as high-quality feedstock for biofuel or bio-lubricant production. Spent coffee grounds oil (SCGO) was investigated for its physicochemical properties while having more free acid groups compared to the reference polyalphaolefin 8 (PAO 8), which may cause faster oxidation. TGA results displayed comparable thermal stability of SCGO and PAO 8 for inert/oxidative atmosphere. The oil composition was characterized by ATR-FTIR, elemental analysis, and GC-EI-MS, where a higher oxygen content was found for SCGO, referring to functional ester/acid groups. The tribological behavior of SCGO was studied as lubricant base oil and as a 5% additive in PAO 8. The condition of fresh and tribologically used oils was investigated with High-Resolution-ESI-MS, and the worn surfaces were evaluated by light microscopy and topographic analysis. The results showed a superior friction coefficient of pure SCGO (µ = 0.092) to PAO 8 (µ = 0.129). The 5% SCGO additive in PAO 8 (µ = 0.095) could significantly reduce friction compared to pure PAO 8 on an unpolished 100Cr6 surface.
en
dc.language.iso
en
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dc.publisher
Taylor & Francis
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dc.relation.ispartof
Green Chemistry Letters and Reviews
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dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
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dc.subject
biolubrication
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dc.subject
life-cycle assessment
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dc.subject
recycling
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dc.subject
sustainability
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dc.subject
Tribology
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dc.title
Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil