Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10198/1144 |
Resumo: | Carbon supported platinum (1% wt) catalysts were prepared by the incipient wetness impregnation method and by organometallic chemical vapor deposition. Catalyst characterization was carried out by means of adsorption and thermogravimetric techniques, and by electron microscopy. The catalyst with higher metal dispersion was produced by incipient wetness impregnation. The catalysts were tested in the catalytic wet air oxidation (200 C and 6.9 bar of oxygen partial pressure) of aqueous solutions containing low molecular weight (C2 to C4) carboxylic acids. Significant conversions (greater than 60% over 2 h) and 100% selectivity towards water and non-carboxylic acid products were observed for both systems. The initial reaction rate was used to compare the performance of the two catalytic materials and direct correspondence to the metal dispersion was found. No metal leaching was observed during reaction and no significant deactivation occurred in three successive catalytic oxidation runs. A kinetic model based on the Langmuir–Hinshelwood formulation was applied and the results were analyzed in terms of a heterogeneously catalyzed free radical mechanism. |
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Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acidsCatalytic wet air oxidation (CWAO)Carbon supported platinum catalystsIncipient wetness impregnationOrganometallic chemical vapor deposition (OMCVD)Carbon supported platinum (1% wt) catalysts were prepared by the incipient wetness impregnation method and by organometallic chemical vapor deposition. Catalyst characterization was carried out by means of adsorption and thermogravimetric techniques, and by electron microscopy. The catalyst with higher metal dispersion was produced by incipient wetness impregnation. The catalysts were tested in the catalytic wet air oxidation (200 C and 6.9 bar of oxygen partial pressure) of aqueous solutions containing low molecular weight (C2 to C4) carboxylic acids. Significant conversions (greater than 60% over 2 h) and 100% selectivity towards water and non-carboxylic acid products were observed for both systems. The initial reaction rate was used to compare the performance of the two catalytic materials and direct correspondence to the metal dispersion was found. No metal leaching was observed during reaction and no significant deactivation occurred in three successive catalytic oxidation runs. A kinetic model based on the Langmuir–Hinshelwood formulation was applied and the results were analyzed in terms of a heterogeneously catalyzed free radical mechanism.SpringerBiblioteca Digital do IPBGomes, HelderSerp, PhilippeKalck, PhilippeFigueiredo, JoséFaria, Joaquim2009-04-01T11:24:24Z20052005-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://hdl.handle.net/10198/1144engengGomes, Helder; Serp, Philippe; Kalck, Philippe; Figueiredo, José; Faria, Joaquim (2005). Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids. Topics in Catalysis. ISSN 1022-5528. 33:1-4, p. 59-681022-5528Topics in Catalysis10.1007/s11244-005-2505-5info: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:RCAAP2023-11-21T10:04:28Zoai:bibliotecadigital.ipb.pt:10198/1144Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:54:42.490025Repositório 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 supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids |
title |
Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids |
spellingShingle |
Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids Gomes, Helder Catalytic wet air oxidation (CWAO) Carbon supported platinum catalysts Incipient wetness impregnation Organometallic chemical vapor deposition (OMCVD) |
title_short |
Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids |
title_full |
Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids |
title_fullStr |
Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids |
title_full_unstemmed |
Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids |
title_sort |
Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids |
author |
Gomes, Helder |
author_facet |
Gomes, Helder Serp, Philippe Kalck, Philippe Figueiredo, José Faria, Joaquim |
author_role |
author |
author2 |
Serp, Philippe Kalck, Philippe Figueiredo, José Faria, Joaquim |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Biblioteca Digital do IPB |
dc.contributor.author.fl_str_mv |
Gomes, Helder Serp, Philippe Kalck, Philippe Figueiredo, José Faria, Joaquim |
dc.subject.por.fl_str_mv |
Catalytic wet air oxidation (CWAO) Carbon supported platinum catalysts Incipient wetness impregnation Organometallic chemical vapor deposition (OMCVD) |
topic |
Catalytic wet air oxidation (CWAO) Carbon supported platinum catalysts Incipient wetness impregnation Organometallic chemical vapor deposition (OMCVD) |
description |
Carbon supported platinum (1% wt) catalysts were prepared by the incipient wetness impregnation method and by organometallic chemical vapor deposition. Catalyst characterization was carried out by means of adsorption and thermogravimetric techniques, and by electron microscopy. The catalyst with higher metal dispersion was produced by incipient wetness impregnation. The catalysts were tested in the catalytic wet air oxidation (200 C and 6.9 bar of oxygen partial pressure) of aqueous solutions containing low molecular weight (C2 to C4) carboxylic acids. Significant conversions (greater than 60% over 2 h) and 100% selectivity towards water and non-carboxylic acid products were observed for both systems. The initial reaction rate was used to compare the performance of the two catalytic materials and direct correspondence to the metal dispersion was found. No metal leaching was observed during reaction and no significant deactivation occurred in three successive catalytic oxidation runs. A kinetic model based on the Langmuir–Hinshelwood formulation was applied and the results were analyzed in terms of a heterogeneously catalyzed free radical mechanism. |
publishDate |
2005 |
dc.date.none.fl_str_mv |
2005 2005-01-01T00:00:00Z 2009-04-01T11:24:24Z |
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/10198/1144 |
url |
http://hdl.handle.net/10198/1144 |
dc.language.iso.fl_str_mv |
eng eng |
language |
eng |
dc.relation.none.fl_str_mv |
Gomes, Helder; Serp, Philippe; Kalck, Philippe; Figueiredo, José; Faria, Joaquim (2005). Carbon supported platinum catalysts for catalytic wet air oxidation of refractory carboxylic acids. Topics in Catalysis. ISSN 1022-5528. 33:1-4, p. 59-68 1022-5528 Topics in Catalysis 10.1007/s11244-005-2505-5 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Springer |
publisher.none.fl_str_mv |
Springer |
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 |
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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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1799135146655350784 |