Moving towards green lubrication: tribological behavior and chemical characterization of spent coffee grounds oil

IF 5.8 3区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Green Chemistry Letters and Reviews Pub Date : 2023-01-02 DOI:10.1080/17518253.2023.2215243

Jessica Pichler, Rosa Maria Eder, L. Widder, M. Varga, M. Marchetti‐Deschmann, M. Frauscher

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引用次数: 0

Abstract

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. GRAPHICAL ABSTRACT

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来源期刊

Green Chemistry Letters and Reviews CHEMISTRY, MULTIDISCIPLINARY-GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

CiteScore

9.10

自引率

3.00%

发文量

期刊介绍： Green Chemistry Letters and Reviews is an Open Access, peer-reviewed journal focused on rapid publication of innovative new syntheses and procedures that reduce or eliminate the use and generation of hazardous materials. Reviews of state-of-the-art green chemistry technologies are also included within the journal''s scope. Green Chemistry Letters and Reviews is divided into three overlapping topic areas: research, education, and industrial implementation. The journal publishes both letters, which concisely communicate the most time-sensitive results, and reviews, which aid researchers in understanding the state of science on important green chemistry topics. Submissions are encouraged which apply the 12 principles of green chemistry to: -Green Chemistry Education- Synthetic Reaction Pathways- Research and Process Analytical Techniques- Separation and Purification Technologies- Renewable Feedstocks- Degradable Products