Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite

Calcium-hydroxyapatite and calcium-fluoroapatite loaded with different amounts of nickel were synthesized and characterized by several techniques including scanning electron microscopy, temperature programmed reduction (TPR), UV-visible-NIR and XPS spectroscopy. Three types of nickel species were de...

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Detalles Bibliográficos
Autores: Boukha, Zouhair, Kacimi, Mohamed, Pereira, Manuel Fernando R., Faria, Joaquim L., Figueiredo, José Luís, Ziyad, Mahfoud
Tipo de recurso: artículo
Fecha de publicación:2007
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/71134
Acceso en línea:http://hdl.handle.net/10810/71134
Access Level:acceso abierto
Palabra clave:DRS
IR
Methane dry reforming
Ni loaded calcium-fluoroapatite
Ni loaded calcium-hydroxyapatite
XPS and TPR
XRD
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spelling Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatiteBoukha, ZouhairKacimi, MohamedPereira, Manuel Fernando R.Faria, Joaquim L.Figueiredo, José LuísZiyad, MahfoudDRSIRMethane dry reformingNi loaded calcium-fluoroapatiteNi loaded calcium-hydroxyapatiteXPS and TPRXRDCalcium-hydroxyapatite and calcium-fluoroapatite loaded with different amounts of nickel were synthesized and characterized by several techniques including scanning electron microscopy, temperature programmed reduction (TPR), UV-visible-NIR and XPS spectroscopy. Three types of nickel species were detected in the two series of catalysts (i) Ni2+ ions exchanged with Ca2+ ions of the apatite framework. This Ni2+/Ca2+ exchange seems to be restricted to nickel loadings inferior to 1 wt% Ni, (ii) small particles of NiO exhibiting strong interactions with the carriers (for x > 1 wt% Ni) and (iii) large particles of NiO which appear at high loadings. The distribution of the nickel between these three hosting sites depends on the nature of the apatite. For instance the amount of exchanged Ni2+ ions in Ni(1)/CaHAp is twice more important than in Ni(1)/CaFAp. The Ni(x)/CaHAp and Ni(x)/CaFAp catalysts were tested in methane dry reforming with CO2. Methane conversion at 600 °C, increases with the nickel loading up to x = 4 where the activity is around the thermodynamic equilibrium (78%) and H2/CO ratio close to 1. These results were confirmed by the investigation of the catalysts activity versus the temperature. Carbon deposition on the catalysts was found to also increase with nickel loading but without provoking any significant decay of the activity after 4 h on stream. The encouraging results achieved were attributed to the synergy between the basic properties of the apatites, their aptitude to chemisorb CO2 and the catalytic features of the supported nickel.Parts of this work were carried out in the framework of the CNRST (Morocco)–GRICES (Portugal) Cooperation Program in Science and Technology.Elsevier202520252007info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/71134reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://doi.org/10.1016/j.apcata.2006.10.029info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/© 2006 Elsevier under CC BY-NC-ND licenseoai:addi.ehu.eus:10810/711342026-06-18T09:23:17Z
dc.title.none.fl_str_mv Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite
title Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite
spellingShingle Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite
Boukha, Zouhair
DRS
IR
Methane dry reforming
Ni loaded calcium-fluoroapatite
Ni loaded calcium-hydroxyapatite
XPS and TPR
XRD
title_short Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite
title_full Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite
title_fullStr Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite
title_full_unstemmed Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite
title_sort Methane dry reforming on Ni loaded hydroxyapatite and fluoroapatite
dc.creator.none.fl_str_mv Boukha, Zouhair
Kacimi, Mohamed
Pereira, Manuel Fernando R.
Faria, Joaquim L.
Figueiredo, José Luís
Ziyad, Mahfoud
author Boukha, Zouhair
author_facet Boukha, Zouhair
Kacimi, Mohamed
Pereira, Manuel Fernando R.
Faria, Joaquim L.
Figueiredo, José Luís
Ziyad, Mahfoud
author_role author
author2 Kacimi, Mohamed
Pereira, Manuel Fernando R.
Faria, Joaquim L.
Figueiredo, José Luís
Ziyad, Mahfoud
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv DRS
IR
Methane dry reforming
Ni loaded calcium-fluoroapatite
Ni loaded calcium-hydroxyapatite
XPS and TPR
XRD
topic DRS
IR
Methane dry reforming
Ni loaded calcium-fluoroapatite
Ni loaded calcium-hydroxyapatite
XPS and TPR
XRD
description Calcium-hydroxyapatite and calcium-fluoroapatite loaded with different amounts of nickel were synthesized and characterized by several techniques including scanning electron microscopy, temperature programmed reduction (TPR), UV-visible-NIR and XPS spectroscopy. Three types of nickel species were detected in the two series of catalysts (i) Ni2+ ions exchanged with Ca2+ ions of the apatite framework. This Ni2+/Ca2+ exchange seems to be restricted to nickel loadings inferior to 1 wt% Ni, (ii) small particles of NiO exhibiting strong interactions with the carriers (for x > 1 wt% Ni) and (iii) large particles of NiO which appear at high loadings. The distribution of the nickel between these three hosting sites depends on the nature of the apatite. For instance the amount of exchanged Ni2+ ions in Ni(1)/CaHAp is twice more important than in Ni(1)/CaFAp. The Ni(x)/CaHAp and Ni(x)/CaFAp catalysts were tested in methane dry reforming with CO2. Methane conversion at 600 °C, increases with the nickel loading up to x = 4 where the activity is around the thermodynamic equilibrium (78%) and H2/CO ratio close to 1. These results were confirmed by the investigation of the catalysts activity versus the temperature. Carbon deposition on the catalysts was found to also increase with nickel loading but without provoking any significant decay of the activity after 4 h on stream. The encouraging results achieved were attributed to the synergy between the basic properties of the apatites, their aptitude to chemisorb CO2 and the catalytic features of the supported nickel.
publishDate 2007
dc.date.none.fl_str_mv 2007
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/71134
url http://hdl.handle.net/10810/71134
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.apcata.2006.10.029
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2006 Elsevier under CC BY-NC-ND license
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2006 Elsevier under CC BY-NC-ND license
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
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