Show simple item record

dc.creatorJankovic, Bojan
dc.creatorČupić, Željko
dc.creatorJovanović, Dušan M.
dc.date.accessioned2019-01-30T17:38:57Z
dc.date.available2019-01-30T17:38:57Z
dc.date.issued2014
dc.identifier.issn1735-207X
dc.identifier.urihttp://cer.ihtm.bg.ac.rs/handle/123456789/1405
dc.description.abstractA series of silica-supported nickel catalyst precursors was synthesized with different SiO2/Ni mole ratios (0.20, 0.80 and 1.15). Non-isothermal reduction of Ni catalyst precursors was investigated by temperature-programmed reduction at four different heating rates (2, 5, 10 and 20 A degrees C min(-1)), in a hydrogen atmosphere. Kinetic parameters (E (a), A) were determined using Friedman isoconversional method. It was found that for all mole ratios, apparent activation energy is practically constant in conversion range of alpha = 30-70 %. In considered conversion range, the following values of apparent activation energy were found: E (a) = 129.5 kJ mol(-1) (SiO2/Ni = 0.20), E (a) = 133.8 kJ mol(-1) (SiO2/Ni = 0.80) and E (a) = 125.0 kJ mol(-1) (SiO2/Ni = 1.15). Using two special functions (y(alpha) and z(alpha)), the kinetic model was determined. It was established that reduction of Ni catalyst precursors with different SiO2/Ni mole ratios is a complex process and can be described by two-parameter estak-Berggren (SB) autocatalytic model. Based on established values of SB parameters for each mole ratio, the possible mechanism was discussed. It was found that for all investigated ratios, the Weibull distribution function fits very well the experimental data, in the wide range of conversions (alpha = 5-95 %). Based on obtained values of Weibull shape parameter (theta), it was found that experimentally evaluated density distribution functions of the apparent activation energies can be approximated by the unbalanced peaked normal distribution.en
dc.publisherSpringer, New York
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.rightsrestrictedAccess
dc.sourceJournal of the Iranian Chemical Society
dc.subjectTemperature-programmed reduction (TPR)en
dc.subjectSiO2/Ni catalystsen
dc.subjectKineticsen
dc.subjectSestak-Berggren autocatalytic modelen
dc.subjectIPPC functionen
dc.titleNon-isothermal reduction of silica-supported nickel catalyst precursors in hydrogen atmosphere: a kinetic study and statistical interpretationen
dc.typearticle
dc.rights.licenseARR
dcterms.abstractЈовановиц, Дусан; Јанковиц, Бојан; Чупић, Жељко;
dc.citation.volume11
dc.citation.issue6
dc.citation.spage1743
dc.citation.epage1758
dc.citation.other11(6): 1743-1758
dc.citation.rankM23
dc.identifier.doi10.1007/s13738-014-0447-1
dc.identifier.rcubConv_3240
dc.identifier.scopus2-s2.0-84910598392
dc.identifier.wos000344082600027
dc.type.versionpublishedVersion


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record