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dc.creatorPavlović, Stefan M.
dc.creatorMarinković, Dalibor
dc.creatorKostić, Milan D.
dc.creatorJanković-Častvan, Ivona M.
dc.creatorMojović, Ljiljana
dc.creatorStanković, Miroslav
dc.creatorVeljković, Vlada B.
dc.date.accessioned2020-02-25T09:18:15Z
dc.date.available2020-02-25T09:18:15Z
dc.date.issued2020
dc.identifier.issn0016-2361
dc.identifier.urihttp://cer.ihtm.bg.ac.rs/handle/123456789/3423
dc.description.abstractThe present paper is focused on the development of a new environment-friendly methanolysis catalyst completely based on waste materials: lignite coal fly ash and chicken eggshells. A novel catalyst based on CaO supported on a fly ash-based zeolitic material (CaO/FA-ZM) was obtained from a cancrinite-sodalite group zeolite-like material (vishnevite type) and active CaO by alkali activation in a new miniature autoclave reactor system and hydration-dehydration. Agitation by rotation of the entire reaction mixture led to a more homogeneous zeolitic product and saved both time and energy. The obtained catalyst structure corresponds to gismondine and the crystallographic modification of calcium silicate (α’-dicalcium silicate) with deposited CaO. The characteristics of the synthesized catalyst were determined using ED-XRF, XRD, FT-IR, SEM, Hg-porosimetry, N2-physisorption, LDPSA, and Hammett indicators. The CaO/FA-ZM catalyst exhibited a high activity (97.8% of FAME for only 30 min) and stability (a negligible drop in activity in five consecutive cycles) in the methanolysis reaction under the optimal reaction conditions (temperature of 60 °C, methanol/oil molar ratio of 6:1, and catalyst concentration of 6 wt%). A kinetic study was performed using two different mechanisms: the irreversible pseudo-first-order reaction mechanism in two regimes (heterogeneous and homogeneous) and the changing mechanism combined with the triacylglycerol mass transfer limitation. Both models showed a satisfactory agreement between the experimental and predicted values of conversion degree (R2 > 0.93), confirming their validity for the CaO-based heterogeneously catalyzed methanolysis. The values of the activation energy calculated for both mechanisms were 67.17 and 58.03 kJ mol−1, respectively.sr
dc.language.isoensr
dc.publisherAmsterdam : Elseviersr
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45001/RS//sr
dc.relationSerbian Academy of Sciences and Arts (the project F-78)sr
dc.rightsrestrictedAccesssr
dc.sourceFuelsr
dc.subjectBiodieselsr
dc.subjectFly ashsr
dc.subjectZeolitic materialsr
dc.subjectEggshellsr
dc.subjectMethanolysissr
dc.subjectKinetic modelingsr
dc.titleA CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel productionsr
dc.typearticlesr
dc.rights.licenseARRsr
dcterms.abstractСтанковић, Мирослав В.; Вељковић, Влада Б.; Павловић, Стефан М.; Маринковић, Далибор М.; Костић, Милан Д.; Јанковић-Частван, Ивона М.; Мојовић, Љиљана В.;
dc.citation.volume267
dc.citation.rankaM21~
dc.identifier.doi10.1016/j.fuel.2020.117171
dc.identifier.scopus2-s2.0-85078715683
dc.identifier.wos000514171800001
dc.type.versionpublishedVersionsr


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