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Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modes

2020-05Artigo científico Acesso aberto
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dc.contributor.authorSousa Lobo, Luís
dc.contributor.authorCarabineiro, Sónia A. C.
dc.contributor.institutionDQ - Departamento de Química
dc.contributor.institutionLAQV@REQUIMTE
dc.contributor.pblMDPI - Multidisciplinary Digital Publishing Institute
dc.date.accessioned2020-09-09T22:16:56Z
dc.date.available2020-09-09T22:16:56Z
dc.date.issued2020-05
dc.descriptionUIDB/50006/2020
dc.description.abstractThis Note aims at clarifying the alternative mechanisms of carbon formation from gases at temperatures above 550 ◦C. Both the growth of carbon nanotubes (CNTs) by a hybrid route, and of graphene layers deposition by a pyrolytic route are analyzed: The transition had no influence in apparent kinetics, but the carbon structure was totally different. The transition temperature from hybrid to pyrolytic growth varies with the gas pressure: Higher temperature transition was possible using lower active gas pressures. The rate-determining step concept is essential to understanding the behavior. In catalytic and hybrid carbon formation, the slower step controls and determines kinetics. In the pyrolytic region, the faster step dominates, and carbon bulk diffusion is blocked: Layers of graphene cover the external catalyst surface. It is easier to optimize CNTs growth (rate, shape, properties) knowing the details of the alternative mechanisms operating.en
dc.description.versionpublishersversion
dc.description.versionpublished
dc.format.extent2335223
dc.identifier.doi10.3390/catal10050465
dc.identifier.issn2073-4344
dc.identifier.otherPURE: 18404598
dc.identifier.otherPURE UUID: 791e9a99-4f0c-4386-a43e-7c5fa361904b
dc.identifier.otherScopus: 85085052474
dc.identifier.otherWOS: 000546007000001
dc.identifier.otherORCID: /0000-0001-9913-4671/work/80090676
dc.identifier.urihttp://hdl.handle.net/10362/103836
dc.identifier.urlhttps://www.scopus.com/pages/publications/85085052474
dc.language.isoeng
dc.peerreviewedyes
dc.subjectCarbon formation
dc.subjectHigh temperature pyrolysis
dc.subjectKinetics
dc.subjectMechanism
dc.subjectStructure
dc.subjectCatalysis
dc.subjectPhysical and Theoretical Chemistry
dc.titleCarbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modesen
dc.typejournal article
degois.publication.issue5
degois.publication.titleCatalysts
degois.publication.volume10
dspace.entity.typePublication
rcaap.rightsopenAccess

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