Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatiles

The valorization of biomass (pine wood) for hydrogen production has been studied in a two-step process, comprising pyrolysis and subsequent steam reforming of the volatiles produced in the first step. This work focuses on the deactivation of the Ni commercial catalyst used in the second step. Pyroly...

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Autores: Ochoa, Aitor, Arregi Joaristi, Aitor, Amutio Izaguirre, Maider, Gayubo Cazorla, Ana Guadalupe, Olazar Aurrecoechea, Martin, Bilbao Elorriaga, Javier, Castaño Sánchez, Pedro
Formato: artículo
Fecha de publicación:2018
País:España
Recursos:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/65939
Acesso em linha:http://hdl.handle.net/10810/65939
Access Level:acceso abierto
Palavra-chave:lignocellulose
steam reforming
hydrogen
deactivation
coke deposition
metallic sintering
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spelling Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatilesOchoa, AitorArregi Joaristi, AitorAmutio Izaguirre, MaiderGayubo Cazorla, Ana GuadalupeOlazar Aurrecoechea, MartinBilbao Elorriaga, JavierCastaño Sánchez, Pedrolignocellulosesteam reforminghydrogendeactivationcoke depositionmetallic sinteringThe valorization of biomass (pine wood) for hydrogen production has been studied in a two-step process, comprising pyrolysis and subsequent steam reforming of the volatiles produced in the first step. This work focuses on the deactivation of the Ni commercial catalyst used in the second step. Pyrolysis of biomass has been performed in a conical spouted bed reactor at 500 ºC, and the in-line catalytic steam reforming of the pyrolysis volatiles, in a fluidized bed reactor at 600 ºC. Deactivated catalyst samples were recovered at different values of time on stream, and analyzed by means of XRD, N2 adsorption-desorption, SEM and TEM microscopies, TPO, Raman and FTIR spectroscopies. The results show that the deactivation is mainly due to the encapsulation of Ni particles by coke, together with Ni sintering, to a lesser extent. The former is ascribed to the condensation of oxygenates (particularly phenols), and the latter is inevitable within the current conditions. As the fraction of uncovered Ni particles decreases with time on stream, the deposition of encapsulating coke is decreased, promoting the deposition of coke on the catalyst support, with a more carbonized structure and formed through the thermal decomposition of phenols in the reaction medium.Elsevier202420242018info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/65939reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://www.sciencedirect.com/science/article/abs/pii/S0926337318303229info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/3.0/es/© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/oai:addi.ehu.eus:10810/659392026-06-18T09:23:17Z
dc.title.none.fl_str_mv Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatiles
title Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatiles
spellingShingle Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatiles
Ochoa, Aitor
lignocellulose
steam reforming
hydrogen
deactivation
coke deposition
metallic sintering
title_short Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatiles
title_full Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatiles
title_fullStr Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatiles
title_full_unstemmed Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatiles
title_sort Coking and sintering progress of a Ni supported catalyst in the steam reforming of biomass pyrolysis volatiles
dc.creator.none.fl_str_mv Ochoa, Aitor
Arregi Joaristi, Aitor
Amutio Izaguirre, Maider
Gayubo Cazorla, Ana Guadalupe
Olazar Aurrecoechea, Martin
Bilbao Elorriaga, Javier
Castaño Sánchez, Pedro
author Ochoa, Aitor
author_facet Ochoa, Aitor
Arregi Joaristi, Aitor
Amutio Izaguirre, Maider
Gayubo Cazorla, Ana Guadalupe
Olazar Aurrecoechea, Martin
Bilbao Elorriaga, Javier
Castaño Sánchez, Pedro
author_role author
author2 Arregi Joaristi, Aitor
Amutio Izaguirre, Maider
Gayubo Cazorla, Ana Guadalupe
Olazar Aurrecoechea, Martin
Bilbao Elorriaga, Javier
Castaño Sánchez, Pedro
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv lignocellulose
steam reforming
hydrogen
deactivation
coke deposition
metallic sintering
topic lignocellulose
steam reforming
hydrogen
deactivation
coke deposition
metallic sintering
description The valorization of biomass (pine wood) for hydrogen production has been studied in a two-step process, comprising pyrolysis and subsequent steam reforming of the volatiles produced in the first step. This work focuses on the deactivation of the Ni commercial catalyst used in the second step. Pyrolysis of biomass has been performed in a conical spouted bed reactor at 500 ºC, and the in-line catalytic steam reforming of the pyrolysis volatiles, in a fluidized bed reactor at 600 ºC. Deactivated catalyst samples were recovered at different values of time on stream, and analyzed by means of XRD, N2 adsorption-desorption, SEM and TEM microscopies, TPO, Raman and FTIR spectroscopies. The results show that the deactivation is mainly due to the encapsulation of Ni particles by coke, together with Ni sintering, to a lesser extent. The former is ascribed to the condensation of oxygenates (particularly phenols), and the latter is inevitable within the current conditions. As the fraction of uncovered Ni particles decreases with time on stream, the deposition of encapsulating coke is decreased, promoting the deposition of coke on the catalyst support, with a more carbonized structure and formed through the thermal decomposition of phenols in the reaction medium.
publishDate 2018
dc.date.none.fl_str_mv 2018
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/65939
url http://hdl.handle.net/10810/65939
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://www.sciencedirect.com/science/article/abs/pii/S0926337318303229
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/3.0/es/
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
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300724

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