Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reforming
12 figures, 2 tables
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/77288 |
| Acceso en línea: | http://hdl.handle.net/10261/77288 |
| Access Level: | acceso abierto |
| Palabra clave: | Chemical looping combustion Reaction kinetics Nickel oxide Oxygen carrier Chemical-looping reforming |
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oai:digital.csic.es:10261/77288 |
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España |
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Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reformingDueso, CristinaOrtiz Navarro, MaríaAbad Secades, AlbertoGarcía Labiano, FranciscoGarcía Labiano, FranciscoDiego Poza, Luis F. deGayán Sanz, PilarAdánez Elorza, JuanChemical looping combustionReaction kineticsNickel oxideOxygen carrierChemical-looping reforming12 figures, 2 tablesThe kinetics of reduction with CH 4, H 2 and CO and oxidation with O 2 of two NiO-based oxygen-carriers for chemical-looping combustion (CLC) and chemical-looping reforming (CLR) prepared by impregnation, NiO18-αAl and NiO21-γAl, have been determined in this work. In both solids, nickel was present as NiO and NiAl 2O 4 in the oxidized state and the NiO/NiAl 2O 4 ratio in the particles was a function of the solid conversion reached in the previous reduction process. Both nickel compounds were active for oxygen transfer although with very different reactivities. Therefore, kinetic parameters for NiO and NiAl 2O 4 reduction were determined for each oxygen carrier and each reacting gas. The reaction rate of NiO reduction was the same in NiO18-αAl and NiO21-γAl particles. A model which assumed a linear relationship between time and conversion was used to describe NiO reduction. Nevertheless, differences in reactivity were observed during NiAl 2O 4 reduction depending on the type of support, α-Al 2O 3 or γ-Al 2O 3, probably due to a different crystalline structure of the alumina. The changing grain size model for spherical grain geometry was used to obtain the kinetic parameters of the NiAl 2O 4 reduction working with both NiO-based oxygen-carriers. Chemical reaction control was assumed for NiO18-αAl whereas diffusion through the product layer was also considered when NiO21-γAl was used as oxygen-carrier. The oxidation reaction was very fast with both materials although small differences were observed again between NiO18-αAl and NiO21-γAl oxygen carriers, probably owing to the presence of a higher amount of NiAl 2O 4 in the solid supported on γ-Al 2O 3. The combined model for consecutive reduction of NiO and NiAl 2O 4 in the oxygen-carrier particles with the kinetic parameters obtained in this work predicted adequately the experimental results with both materials. These kinetic data could be used for the design of CLC and CLR systems.This research was conducted with financial support from the Spanish Ministry of Science and Technology (Project No. CTQ2007-64400). C. Dueso thanks MICINN for a F.P.I. fellowship and M. Ortiz thanks Diputación General de Aragón for a F.P.I. fellowship.Peer ReviewedElsevierMinisterio de Ciencia y Tecnología (España)Ministerio de Ciencia e Innovación (España)Gobierno de Aragón2013201320122013info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/77288reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglésinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/772882026-05-22T06:33:51Z |
| dc.title.none.fl_str_mv |
Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reforming |
| title |
Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reforming |
| spellingShingle |
Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reforming Dueso, Cristina Chemical looping combustion Reaction kinetics Nickel oxide Oxygen carrier Chemical-looping reforming |
| title_short |
Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reforming |
| title_full |
Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reforming |
| title_fullStr |
Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reforming |
| title_full_unstemmed |
Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reforming |
| title_sort |
Reduction and oxidation kinetics of nickel-based oxygen-carriers for chemical-looping combustion and chemical-looping reforming |
| dc.creator.none.fl_str_mv |
Dueso, Cristina Ortiz Navarro, María Abad Secades, Alberto García Labiano, Francisco García Labiano, Francisco Diego Poza, Luis F. de Gayán Sanz, Pilar Adánez Elorza, Juan |
| author |
Dueso, Cristina |
| author_facet |
Dueso, Cristina Ortiz Navarro, María Abad Secades, Alberto García Labiano, Francisco Diego Poza, Luis F. de Gayán Sanz, Pilar Adánez Elorza, Juan |
| author_role |
author |
| author2 |
Ortiz Navarro, María Abad Secades, Alberto García Labiano, Francisco Diego Poza, Luis F. de Gayán Sanz, Pilar Adánez Elorza, Juan |
| author2_role |
author author author author author author |
| dc.contributor.none.fl_str_mv |
Ministerio de Ciencia y Tecnología (España) Ministerio de Ciencia e Innovación (España) Gobierno de Aragón |
| dc.subject.none.fl_str_mv |
Chemical looping combustion Reaction kinetics Nickel oxide Oxygen carrier Chemical-looping reforming |
| topic |
Chemical looping combustion Reaction kinetics Nickel oxide Oxygen carrier Chemical-looping reforming |
| description |
12 figures, 2 tables |
| publishDate |
2012 |
| dc.date.none.fl_str_mv |
2012 2013 2013 2013 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 Postprint info:eu-repo/semantics/acceptedVersion |
| format |
article |
| status_str |
acceptedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/77288 |
| url |
http://hdl.handle.net/10261/77288 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess |
| eu_rights_str_mv |
openAccess |
| dc.publisher.none.fl_str_mv |
Elsevier |
| publisher.none.fl_str_mv |
Elsevier |
| 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 |
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| repository.mail.fl_str_mv |
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| _version_ |
1869406946038120448 |
| score |
15.81155 |