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

Detalhes bibliográficos
Autor(a) principal: Sousa Lobo, Luís
Data de Publicação: 2020
Outros Autores: Carabineiro, Sónia A. C.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/103836
Resumo: UIDB/50006/2020
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spelling Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modesCarbon formationHigh temperature pyrolysisKineticsMechanismStructureCatalysisPhysical and Theoretical ChemistryUIDB/50006/2020This 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.DQ - Departamento de QuímicaLAQV@REQUIMTERUNSousa Lobo, LuísCarabineiro, Sónia A. C.2020-09-09T22:16:56Z2020-052020-05-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10362/103836eng2073-4344PURE: 18404598https://doi.org/10.3390/catal10050465info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T04:49:28Zoai:run.unl.pt:10362/103836Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:40:04.696944Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modes
title Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modes
spellingShingle Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modes
Sousa Lobo, Luís
Carbon formation
High temperature pyrolysis
Kinetics
Mechanism
Structure
Catalysis
Physical and Theoretical Chemistry
title_short Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modes
title_full Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modes
title_fullStr Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modes
title_full_unstemmed Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modes
title_sort Carbon formation at high temperatures (550–1400 ◦c): Kinetics, alternative mechanisms and growth modes
author Sousa Lobo, Luís
author_facet Sousa Lobo, Luís
Carabineiro, Sónia A. C.
author_role author
author2 Carabineiro, Sónia A. C.
author2_role author
dc.contributor.none.fl_str_mv DQ - Departamento de Química
LAQV@REQUIMTE
RUN
dc.contributor.author.fl_str_mv Sousa Lobo, Luís
Carabineiro, Sónia A. C.
dc.subject.por.fl_str_mv Carbon formation
High temperature pyrolysis
Kinetics
Mechanism
Structure
Catalysis
Physical and Theoretical Chemistry
topic Carbon formation
High temperature pyrolysis
Kinetics
Mechanism
Structure
Catalysis
Physical and Theoretical Chemistry
description UIDB/50006/2020
publishDate 2020
dc.date.none.fl_str_mv 2020-09-09T22:16:56Z
2020-05
2020-05-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/103836
url http://hdl.handle.net/10362/103836
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 2073-4344
PURE: 18404598
https://doi.org/10.3390/catal10050465
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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