Production of biodiesel and hydrogen by using a double-function heterogeneous catalyst derived from spent coffee grounds and its thermodynamic analysis

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dc.contributor.authorAtelge, M. R.
dc.date.accessioned2024-12-24T19:27:35Z
dc.date.available2024-12-24T19:27:35Z
dc.date.issued2022
dc.departmentSiirt Üniversitesi
dc.description.abstractBiodiesel and hydrogen are promising liquid and gas energy source alternatives to satisfy fossil fuel demand. In this study, a heterogeneous catalyst, spent coffee grounds derived activated carbon supported, was synthesized using KOH as an activation agent. The highest iodine number was obtained at 600 ?C carbonization temperature and the synthesized catalyst was subjected to the characterization and evaluated in terms of biodiesel and hydrogen production efficiencies. The optimal transesterification reaction parameters were determined as 3 wt% catalyst loading, 9:1 methanol-to-waste cooking oil molar ratio, 90 ?C reaction temperature, and 120 min re-action time. Under optimal reaction conditions, the biodiesel yield was 91.57%. For hydrogen production, 100% conversion was observed in all cases. Among the experimental conditions, the fastest reaction was obtained with the addition of 0.25 g superior catalyst with 2.5% of NaBH4 concentration at 30 ?C reaction temperature. Moreover, the chosen superior catalyst was successfully reused for five cycles to test the reusability of the catalyst. The catalyst performance was almost the same as of the first cycle after regeneration for both trans-esterification and dehydrogenation reactions. Additionally, the activation energy of the transesterification and methanolysis reactions was calculated as 19.15 and 15.48 kJ/mol, respectively. In the thermodynamic aspect, both reactions were endergonic and unspontaneous. Additionally, it can be concluded that the reactants were converted to the products very well due to the indication of entropy change.
dc.identifier.doi10.1016/j.renene.2022.08.018
dc.identifier.endpage15
dc.identifier.issn0960-1481
dc.identifier.issn1879-0682
dc.identifier.scopus2-s2.0-85136231068
dc.identifier.scopusqualityQ1
dc.identifier.startpage1
dc.identifier.urihttps://doi.org/10.1016/j.renene.2022.08.018
dc.identifier.urihttps://hdl.handle.net/20.500.12604/6709
dc.identifier.volume198
dc.identifier.wosWOS:000844300500001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofRenewable Energy
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241222
dc.subjectDouble-function heterogeneous catalyst
dc.subjectBiodiesel
dc.subjectWaste cooking oil
dc.subjectTransesterification
dc.subjectMethanolysis ofNaBH4
dc.subjectThermodynamic analysis
dc.titleProduction of biodiesel and hydrogen by using a double-function heterogeneous catalyst derived from spent coffee grounds and its thermodynamic analysis
dc.typeArticle

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