Thermal deactivation kinetics and thermodynamics of a silica gel using surface area data

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dc.authorid0000-0003-2101-1334en_US
dc.contributor.authorSarıkaya, Yüksel
dc.contributor.authorCeylan, Hasan
dc.contributor.authorÖnal, Muşerref
dc.contributor.authorPekdemir, Abdullah Devrim
dc.date.accessioned2024-07-12T21:40:56Z
dc.date.available2024-07-12T21:40:56Z
dc.date.issued2020en_US
dc.departmentFakülteler, Eğitim Fakültesi, Matematik ve Fen Bilimleri Eğitimi Bölümüen_US
dc.description.abstractA new calculation method was presented using surface area data for the thermal analysis of adsorbents. Five parts from a silica gel (Hypersil) were heated at the temperatures of 500, 640, 700, 770, and 850 degrees C, respectively, for 16 h. The maximum adsorption capacity as liquid nitrogen volume (0.930 cm(3) g(-1)), monolayer capacity (0.093 cm(3) g(-1)), surface area (A(H) = 245 m(2) g(-1)), number of monolayer (10) in the multimolecular adsorption, and heat of the first layer (3300 J mol(-1)) were evaluated from the nitrogen adsorption data obtained at - 196 degrees C. Surface area (A) of the preheated samples was determined similarly. The assumed parameters k=-(partial derivative A/partial derivative T)(p)/A and K= (1 - a)/a were calculated for each preheating temperature, where a = A/A(H) is the relative decrease in the surface area by the thermal deactivation, because thekandKsupplying Arrhenius equations and van't Hoff equation behave as reaction rate constant and equilibrium constant, respectively. The activation energy for the thermal deactivation of the silica gel was calculated as E# = 27330 J mol(-1)from the slope of a straight line which is plotted according to the Arrhenius equation. The enthalpy change (Delta H-0 = 28936 J mol(-1)) and entropy change (Delta S-0=47.42 J mol(-1) K-1) for the same case were, respectively, evaluated from the slope and intercept of a straight line which is plotted according to the van't Hoff equation. Accordingly, temperature dependence of the Gibbs energy is written as Delta G(0)=Delta H-0-T Delta S-0=28936-47.42T by the SI units. The spontaneous nature of the deactivation was discussed using the last relationship.en_US
dc.identifier.citationSarıkaya, Y., Ceylan, H., Önal, M. ve Pekdemir, A. D. (2020). Thermal deactivation kinetics and thermodynamics of a silica gel using surface area data. Journal of Thermal Analysis and Calorimetry, Springer.en_US
dc.identifier.doi10.1007/s10973-020-10132-z
dc.identifier.issn1588-2926
dc.identifier.scopus2-s2.0-85089249063en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://www.x-mol.com/paper/1292891338393133056?recommendPaper=1225093946893975558
dc.identifier.urihttps://doi.prg/10.1007/s10973-020-10132-z
dc.identifier.urihttps://hdl.handle.net/20.500.12415/7557
dc.identifier.wosWOS:000558853400003en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofJournal of Thermal Analysis and Calorimetryen_US
dc.relation.publicationcategoryUluslararası Hakemli Dergide Makale - Kurum Öğretim Elemanıen_US
dc.rightsCC0 1.0 Universal*
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.snmzKY02080
dc.subjectKineticsen_US
dc.subjectSilica gelen_US
dc.subjectSurface areaen_US
dc.subjectThermal deactivationen_US
dc.subjectThermodynamicsen_US
dc.titleThermal deactivation kinetics and thermodynamics of a silica gel using surface area dataen_US
dc.typeArticle
dspace.entity.typePublication

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