Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil
ABSTRACTWith 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. S...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2023-01-01
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| Series: | Green Chemistry Letters and Reviews |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/17518253.2023.2215243 |
| _version_ | 1797450033140858880 |
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| author | Jessica Pichler Rosa Maria Eder Lukas Widder Markus Varga Martina Marchetti-Deschmann Marcella Frauscher |
| author_facet | Jessica Pichler Rosa Maria Eder Lukas Widder Markus Varga Martina Marchetti-Deschmann Marcella Frauscher |
| author_sort | Jessica Pichler |
| collection | DOAJ |
| description | ABSTRACTWith 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. |
| first_indexed | 2024-03-09T14:34:38Z |
| format | Article |
| id | doaj.art-676d6c12e4c946cca8df552cfadb9f76 |
| institution | Directory Open Access Journal |
| issn | 1751-8253 1751-7192 |
| language | English |
| last_indexed | 2024-03-09T14:34:38Z |
| publishDate | 2023-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Green Chemistry Letters and Reviews |
| spelling | doaj.art-676d6c12e4c946cca8df552cfadb9f762023-11-27T14:52:10ZengTaylor & Francis GroupGreen Chemistry Letters and Reviews1751-82531751-71922023-01-0116110.1080/17518253.2023.2215243Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oilJessica Pichler0Rosa Maria Eder1Lukas Widder2Markus Varga3Martina Marchetti-Deschmann4Marcella Frauscher5AC2T research GmbH, Wiener Neustadt, AustriaAC2T research GmbH, Wiener Neustadt, AustriaAC2T research GmbH, Wiener Neustadt, AustriaAC2T research GmbH, Wiener Neustadt, AustriaInstitute of Chemical Technologies and Analytics, TU Wien, Vienna, AustriaAC2T research GmbH, Wiener Neustadt, AustriaABSTRACTWith 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.https://www.tandfonline.com/doi/10.1080/17518253.2023.2215243Tribologysustainabilityrecyclinglife-cycle assessmentbiolubrication |
| spellingShingle | Jessica Pichler Rosa Maria Eder Lukas Widder Markus Varga Martina Marchetti-Deschmann Marcella Frauscher Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil Green Chemistry Letters and Reviews Tribology sustainability recycling life-cycle assessment biolubrication |
| title | Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil |
| title_full | Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil |
| title_fullStr | Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil |
| title_full_unstemmed | Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil |
| title_short | Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil |
| title_sort | moving towards green lubrication tribological behavior and chemical characterization of spent coffee grounds oil |
| topic | Tribology sustainability recycling life-cycle assessment biolubrication |
| url | https://www.tandfonline.com/doi/10.1080/17518253.2023.2215243 |
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