Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studies

This work is an advance on the development of structured catalytic reactors. Here, we present the results of the effect of the main operational variables (reaction temperature, % H2 and % C2H6) on the kinetics of carbonaceous nanomaterials (CNMs) formation by catalytic decomposition of ethane over s...

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Autores: Latorre, Nieves, Cazaña, Fernando, Sebastián, Víctor, Royo, Carlos J., Romeo, Eva, Monzón, Antonio
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/367070
Acceso en línea:http://hdl.handle.net/10261/367070
Access Level:acceso abierto
Palabra clave:Carbon nanofibers
Graphene related materials
Stainless steel foam
Kinetic modelling
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spelling Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studiesLatorre, NievesCazaña, FernandoSebastián, VíctorRoyo, Carlos J.Romeo, EvaMonzón, AntonioCarbon nanofibersGraphene related materialsStainless steel foamKinetic modellingThis work is an advance on the development of structured catalytic reactors. Here, we present the results of the effect of the main operational variables (reaction temperature, % H2 and % C2H6) on the kinetics of carbonaceous nanomaterials (CNMs) formation by catalytic decomposition of ethane over stainless steel foams. Some of the main drawback problems that occur during the operation of chemical structured reactors are related to the preparation of long term stable coatings. The washcoating is the most used technique to deposit the catalytic layer over the substrate. The application of this procedure is quite complex in the case of geometries such as foams or cloths. In the case of the deposition of layers of carbonaceous nanomaterials, an alternative route, avoiding the washcoating, is their direct growth by catalytic decomposition of light hydrocarbons over the surface of the metallic substrate. In the case of structured steel foams, the substrate already contains the catalytic active phases for this reaction, like Fe and Ni, among of the minor components (Cr, Mn, Mo) that can act as promotors/stabilizers.The nanomaterials obtained after reaction were characterized by Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The characterization results indicate that there is a maximum, obtained at ca. 900 °C, 33.3 % of C2H6 and 1.7 % of H2, in the quality of the carbonaceous nanomaterials grown. Under these conditions, the CNMs consist mainly of few layer graphene (FLG) and graphite nanolayers (GNL) encapsulating the metallic nanoparticles. In addition, the kinetic results indicate the existence of another optimum, at ca. 800 °C, 33.3 % of C2H6 and 1.7 % of H2, in the productivity to the carbonaceous nanomaterials. The existence of these optimums is due to the driving force for the diffusion of the carbon atoms through the Fe-Ni nanoparticles (NPs) obtained at high temperatures (e. g. above 800 °C) caused by the competence between two opposite phenomena: the increase of the rate of carbon diffusion through the metallic nanoparticles of Fe-Ni and the deactivation of these nanoparticles. The deactivation is the consequence of the encapsulation and reconstruction of the nanoparticles during the formation of the several types of CNMs. The evolution of the carbon mass during the reaction time was analyzed using a phenomenological kinetic model that takes into account the main stages involved during the formation of carbonaceous nanomaterials: hydrocarbon decomposition, carburization, diffusion, precipitation and deactivation. The results obtained from the kinetic model, along with the characterization results, enable quantify the influence of the operating variables on each stage of the carbonaceous nanomaterial formation and therefore open the way to optimize the process.The authors acknowledge financial support from MINECO (Madrid, Spain) FEDER, Project ENE2013-47880-C3-1-R.Peer reviewedWalter de GruyterEuropean CommissionMinisterio de Economía y Competitividad (España)202420242017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/367070reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO//ENE2013-47880-C3-1-Rhttps://doi.org/10.1515/ijcre-2017-0121Noinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3670702026-05-22T06:33:51Z
dc.title.none.fl_str_mv Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studies
title Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studies
spellingShingle Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studies
Latorre, Nieves
Carbon nanofibers
Graphene related materials
Stainless steel foam
Kinetic modelling
title_short Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studies
title_full Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studies
title_fullStr Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studies
title_full_unstemmed Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studies
title_sort Effect of the operating conditions on the growth of carbonaceous nanomaterials over stainless steel foams. Kinetic and characterization studies
dc.creator.none.fl_str_mv Latorre, Nieves
Cazaña, Fernando
Sebastián, Víctor
Royo, Carlos J.
Romeo, Eva
Monzón, Antonio
author Latorre, Nieves
author_facet Latorre, Nieves
Cazaña, Fernando
Sebastián, Víctor
Royo, Carlos J.
Romeo, Eva
Monzón, Antonio
author_role author
author2 Cazaña, Fernando
Sebastián, Víctor
Royo, Carlos J.
Romeo, Eva
Monzón, Antonio
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv European Commission
Ministerio de Economía y Competitividad (España)
dc.subject.none.fl_str_mv Carbon nanofibers
Graphene related materials
Stainless steel foam
Kinetic modelling
topic Carbon nanofibers
Graphene related materials
Stainless steel foam
Kinetic modelling
description This work is an advance on the development of structured catalytic reactors. Here, we present the results of the effect of the main operational variables (reaction temperature, % H2 and % C2H6) on the kinetics of carbonaceous nanomaterials (CNMs) formation by catalytic decomposition of ethane over stainless steel foams. Some of the main drawback problems that occur during the operation of chemical structured reactors are related to the preparation of long term stable coatings. The washcoating is the most used technique to deposit the catalytic layer over the substrate. The application of this procedure is quite complex in the case of geometries such as foams or cloths. In the case of the deposition of layers of carbonaceous nanomaterials, an alternative route, avoiding the washcoating, is their direct growth by catalytic decomposition of light hydrocarbons over the surface of the metallic substrate. In the case of structured steel foams, the substrate already contains the catalytic active phases for this reaction, like Fe and Ni, among of the minor components (Cr, Mn, Mo) that can act as promotors/stabilizers.
publishDate 2017
dc.date.none.fl_str_mv 2017
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/367070
url http://hdl.handle.net/10261/367070
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO//ENE2013-47880-C3-1-R
https://doi.org/10.1515/ijcre-2017-0121
No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Walter de Gruyter
publisher.none.fl_str_mv Walter de Gruyter
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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