Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic Properties

Alkaline-earth doped multiwall carbon nanotubes, M-CNT (M=Mg, Ca, Sr, Ba) have been prepared by a combined method of ionic exchange and precipitation. The wide characterization of the solids by nitrogen adsorption, ATR–FTIR, thermal analysis, XRD, scanning electron microscopy, transmission electron...

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Autores: Barrios‑Bermúdez, N., Santos‑Granados, J, Cerpa‑Naranjo, A, Rojas‑Cervantes, M.L., Moreno, Rodrigo, Calvino Casilda, Vanesa
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universidad Nacional de Educación a Distancia
Repositorio:e-spacio. Repositorio Institucional de la UNED
Idioma:inglés
OAI Identifier:oai:e-spacio.uned.es:20.500.14468/12767
Acceso en línea:https://hdl.handle.net/20.500.14468/12767
Access Level:acceso abierto
Palabra clave:Alkaline-earth doped carbon nanotubes
Surface and Bulk characterization
Base catalysts
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spelling Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic PropertiesBarrios‑Bermúdez, N.Santos‑Granados, JCerpa‑Naranjo, ARojas‑Cervantes, M.L.Moreno, RodrigoCalvino Casilda, VanesaAlkaline-earth doped carbon nanotubesSurface and Bulk characterizationBase catalystsAlkaline-earth doped multiwall carbon nanotubes, M-CNT (M=Mg, Ca, Sr, Ba) have been prepared by a combined method of ionic exchange and precipitation. The wide characterization of the solids by nitrogen adsorption, ATR–FTIR, thermal analysis, XRD, scanning electron microscopy, transmission electron microscopy, point of zero charge (PZC), and X-ray photoelectron spectroscopy shows that the incorporation of M to the CNTs has been successfully produced. The doping with the alkaline-earth cations causes a decrease in the SBET value of the raw material, mainly due to the blockage of mesopores by the metal carbonate phase formed in most of cases. This metallic phase also contributes to the destabilization of the nanotubes by promoting their oxidation. According to PZC values, the acid character of oxidized CNTs changes to basic for the M-CNT series, Mg-CNT showing the highest PZC value. The basic properties of the catalysts have been tested in the C–C bond forming reaction of Knoevenagel, by carrying out the condensation of ethyl cyanoacetate with benzaldehyde or 4-methoxybenzaldehyde.Springere-Spacio UNED20242024-05-2020192019-05-0420192019-05-04journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14468/12767reponame:e-spacio. Repositorio Institucional de la UNEDinstname:Universidad Nacional de Educación a DistanciaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0oai:e-spacio.uned.es:20.500.14468/127672026-06-06T12:38:31Z
dc.title.none.fl_str_mv Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic Properties
title Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic Properties
spellingShingle Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic Properties
Barrios‑Bermúdez, N.
Alkaline-earth doped carbon nanotubes
Surface and Bulk characterization
Base catalysts
title_short Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic Properties
title_full Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic Properties
title_fullStr Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic Properties
title_full_unstemmed Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic Properties
title_sort Porous Alkaline‑Earth Doped Multiwall Carbon Nanotubes with Base Catalytic Properties
dc.creator.none.fl_str_mv Barrios‑Bermúdez, N.
Santos‑Granados, J
Cerpa‑Naranjo, A
Rojas‑Cervantes, M.L.
Moreno, Rodrigo
Calvino Casilda, Vanesa
author Barrios‑Bermúdez, N.
author_facet Barrios‑Bermúdez, N.
Santos‑Granados, J
Cerpa‑Naranjo, A
Rojas‑Cervantes, M.L.
Moreno, Rodrigo
Calvino Casilda, Vanesa
author_role author
author2 Santos‑Granados, J
Cerpa‑Naranjo, A
Rojas‑Cervantes, M.L.
Moreno, Rodrigo
Calvino Casilda, Vanesa
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv e-Spacio UNED
dc.subject.none.fl_str_mv Alkaline-earth doped carbon nanotubes
Surface and Bulk characterization
Base catalysts
topic Alkaline-earth doped carbon nanotubes
Surface and Bulk characterization
Base catalysts
description Alkaline-earth doped multiwall carbon nanotubes, M-CNT (M=Mg, Ca, Sr, Ba) have been prepared by a combined method of ionic exchange and precipitation. The wide characterization of the solids by nitrogen adsorption, ATR–FTIR, thermal analysis, XRD, scanning electron microscopy, transmission electron microscopy, point of zero charge (PZC), and X-ray photoelectron spectroscopy shows that the incorporation of M to the CNTs has been successfully produced. The doping with the alkaline-earth cations causes a decrease in the SBET value of the raw material, mainly due to the blockage of mesopores by the metal carbonate phase formed in most of cases. This metallic phase also contributes to the destabilization of the nanotubes by promoting their oxidation. According to PZC values, the acid character of oxidized CNTs changes to basic for the M-CNT series, Mg-CNT showing the highest PZC value. The basic properties of the catalysts have been tested in the C–C bond forming reaction of Knoevenagel, by carrying out the condensation of ethyl cyanoacetate with benzaldehyde or 4-methoxybenzaldehyde.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-05-04
2019
2019-05-04
2024
2024-05-20
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14468/12767
url https://hdl.handle.net/20.500.14468/12767
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
http://creativecommons.org/licenses/by-nc-nd/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:e-spacio. Repositorio Institucional de la UNED
instname:Universidad Nacional de Educación a Distancia
instname_str Universidad Nacional de Educación a Distancia
reponame_str e-spacio. Repositorio Institucional de la UNED
collection e-spacio. Repositorio Institucional de la UNED
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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