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dc.creatorJankovic, Bojan
dc.creatorČupić, Željko
dc.creatorJovanović, Dušan M.
dc.creatorStanković, Miroslav
dc.date.accessioned2019-04-19T08:49:13Z
dc.date.available2016-09-30
dc.date.issued2016
dc.identifier.issn0098-6445
dc.identifier.urihttp://cer.ihtm.bg.ac.rs/handle/123456789/2662
dc.description.abstractA series of silica-supported nickel catalyst precursors was synthesized with different SiO2/Ni molar ratios. Reduction of Ni catalyst precursors with different SiO2/Ni molar ratios under a hydrogen atmosphere was investigated at different heating rates. Kinetic parameters were determined using Kissinger-Akahira-Sunose isoconversional and invariant kinetic parameter methods. It was found that for all molar ratios, the apparent activation energy (E-a) is practically constant in the conversion range of 0.20 LT = alpha LT = 0.80. In the considered conversion range, following values of E-a were found: 134.5 kJ mol(-1) (SiO2/Ni = 0.20), 139.6 kJ mol(-1) (SiO2 /Ni = 0.80), and 128.3 kJ mol(-1) (SiO2/Ni = 1.15). It was established that the reduction of Ni catalyst precursors with different SiO2/Ni molar ratios is a complex process and can be described by the Sestak-Berggren autocatalytic model. It was found that the reaction is more Langmuir-Hinshelwood type, as hydrogen dissociates rapidly on surface nuclei and the dissociated hydrogen reacts with the Ni-O active system. It was concluded that the reduction process proceeds through bulk nucleation, which is a dominant mechanism, where three-dimensional growth of crystals with polyhedron-like morphology exists. It was found that the Ni/Si ratio decreases after the reduction process. This has been explained by low Ni and higher Si surface concentrations. It has been disclosed that Ni dispersion decreases.en
dc.publisherPhiladelphia : Taylor & Francis Inc
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172015/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45001/RS//
dc.rightsembargoedAccess
dc.sourceChemical Engineering Communications
dc.subjectAutocatalysisen
dc.subjectcatalyst supporten
dc.subjectComplexityen
dc.subjectKineticsen
dc.subjectReductionen
dc.titleKinetic Analysis of Nonisothermal Reduction of Silica-Supported Nickel Catalyst Precursors in a Hydrogen Atmosphereen
dc.typearticle
dc.rights.licenseBY-NC-ND
dcterms.abstractЧупић, Жељко; Јанковиц, Бојан; Јовановић, Душан М.; Станковић, Мирослав;
dc.citation.volume203
dc.citation.issue2
dc.citation.spage182
dc.citation.epage199
dc.citation.rankM22
dc.description.otherThis is the peer reviewed version of the following article: Janković, B., Čupić, Ž., Jovanović, D., Stanković, M., 2016. Kinetic Analysis of Nonisothermal Reduction of Silica-Supported Nickel Catalyst Precursors in a Hydrogen Atmosphere. Chemical Engineering Communications 203, 182–199. [https://doi.org/10.1080/00986445.2014.983268]
dc.description.other[http://cer.ihtm.bg.ac.rs/handle/123456789/1980]
dc.identifier.doi10.1080/00986445.2014.983268
dc.identifier.fulltexthttp://cer.ihtm.bg.ac.rs/bitstream/id/6299/10.1080-00986445.2014.983268.pdf
dc.identifier.scopus2-s2.0-84947280095
dc.identifier.wos000366611100004
dc.type.versionacceptedVersion


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