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Kinetic Analysis of Nonisothermal Reduction of Silica-Supported Nickel Catalyst Precursors in a Hydrogen Atmosphere
dc.creator | Jankovic, Bojan | |
dc.creator | Čupić, Željko | |
dc.creator | Jovanović, Dušan M. | |
dc.creator | Stanković, Miroslav | |
dc.date.accessioned | 2019-01-30T17:50:55Z | |
dc.date.available | 2019-01-30T17:50:55Z | |
dc.date.issued | 2016 | |
dc.identifier.issn | 0098-6445 | |
dc.identifier.uri | https://cer.ihtm.bg.ac.rs/handle/123456789/1980 | |
dc.description.abstract | A 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.publisher | Taylor & Francis Inc, Philadelphia | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/172015/RS// | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45001/RS// | |
dc.rights | restrictedAccess | |
dc.source | Chemical Engineering Communications | |
dc.subject | Autocatalysis | en |
dc.subject | Catalyst support | en |
dc.subject | Complexity | en |
dc.subject | Kinetics | en |
dc.subject | Reduction | en |
dc.title | Kinetic Analysis of Nonisothermal Reduction of Silica-Supported Nickel Catalyst Precursors in a Hydrogen Atmosphere | en |
dc.type | article | |
dc.rights.license | ARR | |
dcterms.abstract | Јанковиц, Бојан; Чупић, Жељко; Станковић, Мирослав; Јовановиц, Дусан; | |
dc.citation.volume | 203 | |
dc.citation.issue | 2 | |
dc.citation.spage | 182 | |
dc.citation.epage | 199 | |
dc.citation.other | 203(2): 182-199 | |
dc.citation.rank | M22 | |
dc.description.other | The peer-reviewed version: [http://cer.ihtm.bg.ac.rs/handle/123456789/2662] | |
dc.identifier.doi | 10.1080/00986445.2014.983268 | |
dc.identifier.scopus | 2-s2.0-84947280095 | |
dc.identifier.wos | 000366611100004 | |
dc.type.version | publishedVersion |