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Pozzolanic activity of oil-refining catalyst: evaluation by electron and atomic microscopy

2015-08Journal article Restricted access
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dc.contributor.authorJeremias, J.
dc.contributor.authorNogueira, I.
dc.contributor.authorNolasco, P.
dc.contributor.authorCarvalho, P. A.
dc.contributor.authorFerreira, C.
dc.contributor.authorCosta, Carla
dc.date.accessioned2016-04-22T13:59:41Z
dc.date.available2016-04-22T13:59:41Z
dc.date.issued2015-08
dc.description.abstractThe reuse of waste fluid catalytic cracking (FCC) catalyst as partial surrogate for cement can reduce the environmental impact of both the oil-refinery and cement production industries [1,2]. FCC catalysts can be considered as pozzolanic materials since in the presence of water they tend to chemically react with calcium hydroxide to produce compounds possessing cementitious properties [3,4]. In addition, partial replacement of cement with FCC catalysts can enhance the performance of pastes and mortars, namely by improving their compressive strength [5,6]. In the present work the reaction of waste FCC catalyst with Ca(OH)2 has been investigated after a curing time of 28 days by scanning electron microscopy (SEM) with electron backscattered signal (BSE) combined with X-ray energy dispersive spectroscopy (EDS) carried out with a JEOL JSM 7001F instrument operated at 15 kV coupled to an INCA pentaFetx3 Oxford spectrometer. The polished cross-sections of FCC particles embedded in resin have also been evaluated by atomic force microscopy (AFM) in contact mode (CM) using a NanoSurf EasyScan 2 instrument. The SEM/EDS results revealed that an inward migration of Ca occurred during the reaction. A weaker outward migration of Si and Al was also apparent (Fig. 1). The migration of Ca was not homogeneous and tended to follow high-diffusivity paths within the porous waste FCC catalyst particles. The present study suggests that the porosity of waste FCC catalysts is key for the migration/reaction of Ca from the surrounding matrix, playing an important role in the pozzolanic activity of the system. The topography images and surface roughness parameters obtained by atomic force microscopy can be used to infer the local porosity in waste FCC catalyst particles (Fig. 2).pt_PT
dc.identifier.citationJEREMIAS, J.; [et al.] - Pozzolanic activity of oil-refining catalyst: evaluation by electron and atomic microscopy. Microscopy and Microanalysis. ISSN 1431-9276. Vol. 21, S6, (2015), 80-81.pt_PT
dc.identifier.doi10.1017/S143192761401410Xpt_PT
dc.identifier.issn1431-9276
dc.identifier.issn1435-8115
dc.identifier.urihttp://hdl.handle.net/10400.21/6079
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMicroscopy Society of Americapt_PT
dc.relationPEst-OE/CTM-UI0084/2011pt_PT
dc.relationECO-Zement: Reuse of fluid catalytic cracking waste from oil refineries in cement-based materials
dc.relation.publisherversionhttp://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9947002&fileId=S143192761401410Xpt_PT
dc.titlePozzolanic activity of oil-refining catalyst: evaluation by electron and atomic microscopypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleECO-Zement: Reuse of fluid catalytic cracking waste from oil refineries in cement-based materials
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FECM%2F113115%2F2009/PT
oaire.citation.endPage81pt_PT
oaire.citation.issueS6pt_PT
oaire.citation.startPage80pt_PT
oaire.citation.volume21pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameCosta
person.givenNameCarla
person.identifier.orcid0000-0003-4222-4734
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication6dd2b0ba-82ea-4928-be43-62f14e275ac3
relation.isAuthorOfPublication.latestForDiscovery6dd2b0ba-82ea-4928-be43-62f14e275ac3
relation.isProjectOfPublicationc0232b48-5e98-47b5-8580-772a0db2c566
relation.isProjectOfPublication.latestForDiscoveryc0232b48-5e98-47b5-8580-772a0db2c566

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