Sintering behavior of TiO2-supported model cobalt Fischer-tropsch catalysts under H2 reducing conditions and elevated temperature

dc.contributor.authorXaba, B.M.
dc.contributor.authorDe Villiers, J.P.R. (Johan)
dc.date.accessioned2016-10-14T09:24:01Z
dc.date.issued2016-09
dc.description.abstractThe sintering of model TiO2-supported cobalt catalysts has been studied. The TiO2 supports used were anatase, P25 (85% anatase-15% rutile) and rutile. The catalysts were characterized at each stage of treatment. These treatment stages were calcination, reduction and sintering. It was found that the TiO2 support does not influence the Co3O4 crystallite and particle size as shown by powder x-ray diffraction (XRD) and transmission electron microscopy (TEM) respectively. The reduction of the cobalt catalysts and bare supports was studied by temperature programmed reduction (TPR). It was found that the bare supports were not as inert as expected. The supports showed minor reduction as seen in the H2 consumption. All the cobalt catalysts showed a two-step reduction. Sintering of anatase-supported cobalt was shown to be the most substantial with P25- and rutile-supported showing a lower sintering tendency; P25- supported cobalt being the most stable based on TEM measurements. Sintering kinetics based on the Generalized Power law Expression (GPLE) model, showed that sintering of anatase-supported cobalt is the most rapid with a large sintering rate constant. Sintering of P25-supported cobalt is the lowest, shown by the lowest sintering rate constant. The study has conclusively shown the effect of the catalyst support phase. The study has also shown that the use of high surface area supports is not necessarily the only answer to preventing sintering. The phase of the catalyst support is also important.en_ZA
dc.description.departmentMaterials Science and Metallurgical Engineeringen_ZA
dc.description.embargo2017-09-30
dc.description.librarianhb2016en_ZA
dc.description.sponsorshipSasol Group Technology, National Research Foundation and the University of Pretoria.en_ZA
dc.description.urihttp://pubs.acs.org/journal/iecreden_ZA
dc.identifier.citationXaba, BM & De Villiers, JPR 2016, 'Sintering behavior of TiO2-supported model cobalt Fischer-tropsch catalysts under H2 reducing conditions and elevated temperature', Industrial and Engineering Chemistry Research, vol. 55, no. 35, pp. 9397-9407.en_ZA
dc.identifier.issn0888-5885 (print)
dc.identifier.issn1520-5045 (online)
dc.identifier.other10.1021/acs.iecr.6b02311
dc.identifier.urihttp://hdl.handle.net/2263/57314
dc.language.isoenen_ZA
dc.publisherAmerican Chemical Societyen_ZA
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Industrial and Engineering Chemistry Research, © 2016 American Chemical Society after peer review and technical editing by the publisher.en_ZA
dc.subjectTiO2en_ZA
dc.subjectSinteringen_ZA
dc.subjectCobalten_ZA
dc.subjectAnataseen_ZA
dc.subjectRutileen_ZA
dc.subjectP25en_ZA
dc.subjectCrystalliteen_ZA
dc.subjectParticle sizeen_ZA
dc.subjectTemperature programmed reduction (TPR)en_ZA
dc.subjectX-ray diffraction (XRD)en_ZA
dc.subjectTransmission electron microscopy (TEM)en_ZA
dc.subjectGeneralized power law expression (GPLE)en_ZA
dc.subject.otherEngineering, built environment and information technology articles SDG-07
dc.subject.otherSDG-07: Affordable and clean energy
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.subject.otherEngineering, built environment and information technology articles SDG-12
dc.subject.otherSDG-12: Responsible consumption and production
dc.subject.otherEngineering, built environment and information technology articles SDG-13
dc.subject.otherSDG-13: Climate action
dc.titleSintering behavior of TiO2-supported model cobalt Fischer-tropsch catalysts under H2 reducing conditions and elevated temperatureen_ZA
dc.typePostprint Articleen_ZA

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