Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.

[EN]Aluminum was incorporated into SBA-15 supports at molar ratios Si/Al ¼ 10 and 2 by the pH-adjusting method. The calcined mesoporous Al-SBA-15 supports, as well as the Al-free SBA-15 support, were impregnated with ammonium paratungstate ((NH4)10[H2W12O42]4H2O) aqueous solution. Tungsten carbide (...

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Detalles Bibliográficos
Autores: García Álvarez, Mayra, Chimentão, R.J., Tichit, D., Santos, J.B.O., Dafinov, A., Modesto-López, L.B., Rosell-Llompart, J., Güell, E.J., Gispert-Guirado, F., Llorca, J., Medina, F.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2016
País:España
Institución:Universidad de Salamanca (USAL)
Repositorio:GREDOS. Repositorio Institucional de la Universidad de Salamanca
OAI Identifier:oai:gredos.usal.es:10366/155559
Acceso en línea:http://hdl.handle.net/10366/155559
Access Level:acceso abierto
Palabra clave:Tungsten carbide
Mesoporous silica
SBA-15
Al-SBA-15
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repository_id_str
spelling Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.García Álvarez, MayraChimentão, R.J.Tichit, D.Santos, J.B.O.Dafinov, A.Modesto-López, L.B.Rosell-Llompart, J.Güell, E.J.Gispert-Guirado, F.Llorca, J.Medina, F.Tungsten carbideMesoporous silicaSBA-15Al-SBA-15[EN]Aluminum was incorporated into SBA-15 supports at molar ratios Si/Al ¼ 10 and 2 by the pH-adjusting method. The calcined mesoporous Al-SBA-15 supports, as well as the Al-free SBA-15 support, were impregnated with ammonium paratungstate ((NH4)10[H2W12O42]4H2O) aqueous solution. Tungsten carbide (W2C) was synthesized by temperature programmed carburization (TPC) from the WO3 sup- ported on Al-SBA-15 and SBA-15 in a flow of CH4/H2. These resultant materials were characterized by powder X-ray diffraction (XRD), N2 adsorption/desorption, 27Al NMR and Raman spectroscopies, and transmission electron microscopies (TEM and HRTEM). W2C species were obtained after the carburiza- tion process in all the materials. The mesoporous structure of the SBA-15 supports was preserved at all synthesis steps. XRD and TEM analyses revealed that the introduction of aluminum species into the SBA- 15 greatly enhanced the dispersion of WO3 and W2C phases during the calcination and carburization steps, respectively. In situ XRD measured during the carburization in a synchrotron facility provided further details of the reduction of tungsten trioxide species as a function of temperature. The presence of aluminum in the SBA-15 notably affected the distribution and the reduction temperature of the tungsten oxide species.Elsevier [Commercial Publisher]202420242016info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10366/155559reponame:GREDOS. Repositorio Institucional de la Universidad de Salamancainstname:Universidad de Salamanca (USAL)InglésJCI-2010-07328CTQ2012-35789CTQ200608196 (255-EST-FPI)Attribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:gredos.usal.es:10366/1555592026-06-07T06:28:51Z
dc.title.none.fl_str_mv Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.
title Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.
spellingShingle Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.
García Álvarez, Mayra
Tungsten carbide
Mesoporous silica
SBA-15
Al-SBA-15
title_short Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.
title_full Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.
title_fullStr Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.
title_full_unstemmed Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.
title_sort Synthesis of tungsten carbide on Al-SBA-15 mesoporous materials by carburization.
dc.creator.none.fl_str_mv García Álvarez, Mayra
Chimentão, R.J.
Tichit, D.
Santos, J.B.O.
Dafinov, A.
Modesto-López, L.B.
Rosell-Llompart, J.
Güell, E.J.
Gispert-Guirado, F.
Llorca, J.
Medina, F.
author García Álvarez, Mayra
author_facet García Álvarez, Mayra
Chimentão, R.J.
Tichit, D.
Santos, J.B.O.
Dafinov, A.
Modesto-López, L.B.
Rosell-Llompart, J.
Güell, E.J.
Gispert-Guirado, F.
Llorca, J.
Medina, F.
author_role author
author2 Chimentão, R.J.
Tichit, D.
Santos, J.B.O.
Dafinov, A.
Modesto-López, L.B.
Rosell-Llompart, J.
Güell, E.J.
Gispert-Guirado, F.
Llorca, J.
Medina, F.
author2_role author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Tungsten carbide
Mesoporous silica
SBA-15
Al-SBA-15
topic Tungsten carbide
Mesoporous silica
SBA-15
Al-SBA-15
description [EN]Aluminum was incorporated into SBA-15 supports at molar ratios Si/Al ¼ 10 and 2 by the pH-adjusting method. The calcined mesoporous Al-SBA-15 supports, as well as the Al-free SBA-15 support, were impregnated with ammonium paratungstate ((NH4)10[H2W12O42]4H2O) aqueous solution. Tungsten carbide (W2C) was synthesized by temperature programmed carburization (TPC) from the WO3 sup- ported on Al-SBA-15 and SBA-15 in a flow of CH4/H2. These resultant materials were characterized by powder X-ray diffraction (XRD), N2 adsorption/desorption, 27Al NMR and Raman spectroscopies, and transmission electron microscopies (TEM and HRTEM). W2C species were obtained after the carburiza- tion process in all the materials. The mesoporous structure of the SBA-15 supports was preserved at all synthesis steps. XRD and TEM analyses revealed that the introduction of aluminum species into the SBA- 15 greatly enhanced the dispersion of WO3 and W2C phases during the calcination and carburization steps, respectively. In situ XRD measured during the carburization in a synchrotron facility provided further details of the reduction of tungsten trioxide species as a function of temperature. The presence of aluminum in the SBA-15 notably affected the distribution and the reduction temperature of the tungsten oxide species.
publishDate 2016
dc.date.none.fl_str_mv 2016
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10366/155559
url http://hdl.handle.net/10366/155559
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv JCI-2010-07328
CTQ2012-35789
CTQ200608196 (255-EST-FPI)
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier [Commercial Publisher]
publisher.none.fl_str_mv Elsevier [Commercial Publisher]
dc.source.none.fl_str_mv reponame:GREDOS. Repositorio Institucional de la Universidad de Salamanca
instname:Universidad de Salamanca (USAL)
instname_str Universidad de Salamanca (USAL)
reponame_str GREDOS. Repositorio Institucional de la Universidad de Salamanca
collection GREDOS. Repositorio Institucional de la Universidad de Salamanca
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869405379574628352
score 15,300719

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