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Leaching efficiency and kinetics of the recovery of palladium and rhodium from a spent auto-catalyst in HCl/CuCl2 media

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dc.contributor.authorNogueira, Carlos A.
dc.contributor.authorPaiva, Ana Paula
dc.contributor.authorCosta, Maria Clara
dc.contributor.authorRosa Da Costa, Ana
dc.date.accessioned2020-08-06T09:00:38Z
dc.date.available2020-08-06T09:00:38Z
dc.date.issued2019
dc.description.abstractThe recycling of scarce elements such as platinum-group metals is becoming crucial due to their growing importance in current and emerging applications. In this sense, the recovery of palladium and rhodium from a spent auto-catalyst by leaching in HCl/CuCl2 media was studied, aiming at assessing the kinetic performance as well as the influence of some processing factors, and the behaviour of contaminant metals. Based on a kinetic model developed for the present case, the influence of temperature was evaluated and the corresponding values of activation energy were estimated as 60.1 ± 4.1 kJ mol-1 for Pd and 44.3 ± 7.3 kJ mol-1 for Rh, indicating the relevance of the chemical step rather than diffusion. This finding was corroborated by the non-significant influence of the stirring velocity. The reaction orders were estimated for each leaching reagent: for HCl, values of 2.1 ± 0.1 for Pd and 1.0 ± 0.3 for Rh were obtained; for Cu2+, the obtained values were 0.42 ± 0.04 for Pd and 0.36 ± 0.06 for Rh. Without any significant loss of efficiency, solutions with higher metal concentrations were obtained using lower liquid/solid ratios, such as 5 L/kg. The main contaminant in solution was aluminum, and its leaching was found to be very dependent on the temperature and acid concentration.pt_PT
dc.description.sponsorshipPortuguese national funds through FCT – Fundação para a Ciência e a Tecnologia (Lisbon, Portugal), under the projects reference numbers PTDC/QUI-QUI/109970/2009, UID/Multi/04326/2019 and UID/MULTI/00612/2013.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1080/09593330.2018.1563635pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.1/14612
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherTaylor & Francispt_PT
dc.subjectCatalysispt_PT
dc.subjectKineticspt_PT
dc.subjectRecyclingpt_PT
dc.subjectPalladiumpt_PT
dc.subjectRhodiumpt_PT
dc.titleLeaching efficiency and kinetics of the recovery of palladium and rhodium from a spent auto-catalyst in HCl/CuCl2 mediapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FQUI-QUI%2F109970%2F2009/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F00612%2F2013/PT
oaire.citation.endPage2304pt_PT
oaire.citation.issue18pt_PT
oaire.citation.startPage2293pt_PT
oaire.citation.titleEnvironmental Technologypt_PT
oaire.citation.volume41pt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream5876
person.familyNameCosta
person.familyNameRosa da Costa
person.givenNameMaria Clara
person.givenNameAna M
person.identifier305029
person.identifier.ciencia-id7110-A28E-3C8A
person.identifier.ciencia-idA418-A85E-5DB1
person.identifier.orcid0000-0003-1340-5237
person.identifier.orcid0000-0003-0225-9537
person.identifier.ridM-6189-2013
person.identifier.ridE-2165-2012
person.identifier.scopus-author-id35354952400
person.identifier.scopus-author-id53986075100
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication0ca8c16f-6881-4662-bafc-cc51c5ce8d88
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