Catalysis of ceria incorporated magnesium hydride: a follow up study

Detalhes bibliográficos
Autor(a) principal: Pukazhselvan, D.
Data de Publicação: 2022
Outros Autores: Çaha, Ihsan, Jakka, Suresh Kumar, Graça, Vanessa C.D., Holz, Laura I.V., Soares, M.J., Kovalevsky, A.V, Deepak, Francis Leonard, Fagg, Duncan Paul
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/35842
Resumo: In continuation with the results explored in our recent previous study (https://doi.org/10.1016/j.apsusc.2021.150062), the current work sheds more light regarding the active in situ catalytic species in ceria additive loaded hydrogen storage system, MgH2. For this study, two samples, MgH2+0.167CeO2 and MgH2+0.5CeO2 were processed through mechanical milling (5 h/200 rpm) and tests were conducted at various stages of hydrogenation/dehydrogenation cycles (cycles: 1, 5 and 10). Evidence for mild chemical interaction between MgH2 and CeO2 is observed at the time of mechanical milling, whereas strong redox type interaction is witnessed in the cycle tested samples. In-situ X ray diffraction study confirms that the thermally activated interaction between MgH2 and CeO2 does not produce MgO. In situ Raman spectra provide crucial evidence that reduced cerium oxides exist at all stages of interactions in the MgH2/CeO2 hydrogen storage system. Detailed advanced electron microscopic observations concur well with the in-situ X ray diffraction and Raman spectroscopy studies. Although Gibbs free energy calculations reveal the possible existence of cerium hydrides, owing to the structural similarities between CeHx and CeOx phases, the chemical identity of the most abundant catalytic product remains debatable. Regarding the catalytic mechanism, suppression of MgO rock salt formation is identified to be a key step where the role of CeHx/CeOx interfaces gains more importance.
id RCAP_e37686b0e29af5071083a12f2a2d4da4
oai_identifier_str oai:ria.ua.pt:10773/35842
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling Catalysis of ceria incorporated magnesium hydride: a follow up studyIn continuation with the results explored in our recent previous study (https://doi.org/10.1016/j.apsusc.2021.150062), the current work sheds more light regarding the active in situ catalytic species in ceria additive loaded hydrogen storage system, MgH2. For this study, two samples, MgH2+0.167CeO2 and MgH2+0.5CeO2 were processed through mechanical milling (5 h/200 rpm) and tests were conducted at various stages of hydrogenation/dehydrogenation cycles (cycles: 1, 5 and 10). Evidence for mild chemical interaction between MgH2 and CeO2 is observed at the time of mechanical milling, whereas strong redox type interaction is witnessed in the cycle tested samples. In-situ X ray diffraction study confirms that the thermally activated interaction between MgH2 and CeO2 does not produce MgO. In situ Raman spectra provide crucial evidence that reduced cerium oxides exist at all stages of interactions in the MgH2/CeO2 hydrogen storage system. Detailed advanced electron microscopic observations concur well with the in-situ X ray diffraction and Raman spectroscopy studies. Although Gibbs free energy calculations reveal the possible existence of cerium hydrides, owing to the structural similarities between CeHx and CeOx phases, the chemical identity of the most abundant catalytic product remains debatable. Regarding the catalytic mechanism, suppression of MgO rock salt formation is identified to be a key step where the role of CeHx/CeOx interfaces gains more importance.Elsevier2024-08-01T00:00:00Z2022-08-01T00:00:00Z2022-08info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/35842eng0360-319910.1016/j.ijhydene.2022.06.228Pukazhselvan, D.Çaha, IhsanJakka, Suresh KumarGraça, Vanessa C.D.Holz, Laura I.V.Soares, M.J.Kovalevsky, A.VDeepak, Francis LeonardFagg, Duncan Paulinfo:eu-repo/semantics/embargoedAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:08:48Zoai:ria.ua.pt:10773/35842Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:06:40.768592Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Catalysis of ceria incorporated magnesium hydride: a follow up study
title Catalysis of ceria incorporated magnesium hydride: a follow up study
spellingShingle Catalysis of ceria incorporated magnesium hydride: a follow up study
Pukazhselvan, D.
title_short Catalysis of ceria incorporated magnesium hydride: a follow up study
title_full Catalysis of ceria incorporated magnesium hydride: a follow up study
title_fullStr Catalysis of ceria incorporated magnesium hydride: a follow up study
title_full_unstemmed Catalysis of ceria incorporated magnesium hydride: a follow up study
title_sort Catalysis of ceria incorporated magnesium hydride: a follow up study
author Pukazhselvan, D.
author_facet Pukazhselvan, D.
Çaha, Ihsan
Jakka, Suresh Kumar
Graça, Vanessa C.D.
Holz, Laura I.V.
Soares, M.J.
Kovalevsky, A.V
Deepak, Francis Leonard
Fagg, Duncan Paul
author_role author
author2 Çaha, Ihsan
Jakka, Suresh Kumar
Graça, Vanessa C.D.
Holz, Laura I.V.
Soares, M.J.
Kovalevsky, A.V
Deepak, Francis Leonard
Fagg, Duncan Paul
author2_role author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Pukazhselvan, D.
Çaha, Ihsan
Jakka, Suresh Kumar
Graça, Vanessa C.D.
Holz, Laura I.V.
Soares, M.J.
Kovalevsky, A.V
Deepak, Francis Leonard
Fagg, Duncan Paul
description In continuation with the results explored in our recent previous study (https://doi.org/10.1016/j.apsusc.2021.150062), the current work sheds more light regarding the active in situ catalytic species in ceria additive loaded hydrogen storage system, MgH2. For this study, two samples, MgH2+0.167CeO2 and MgH2+0.5CeO2 were processed through mechanical milling (5 h/200 rpm) and tests were conducted at various stages of hydrogenation/dehydrogenation cycles (cycles: 1, 5 and 10). Evidence for mild chemical interaction between MgH2 and CeO2 is observed at the time of mechanical milling, whereas strong redox type interaction is witnessed in the cycle tested samples. In-situ X ray diffraction study confirms that the thermally activated interaction between MgH2 and CeO2 does not produce MgO. In situ Raman spectra provide crucial evidence that reduced cerium oxides exist at all stages of interactions in the MgH2/CeO2 hydrogen storage system. Detailed advanced electron microscopic observations concur well with the in-situ X ray diffraction and Raman spectroscopy studies. Although Gibbs free energy calculations reveal the possible existence of cerium hydrides, owing to the structural similarities between CeHx and CeOx phases, the chemical identity of the most abundant catalytic product remains debatable. Regarding the catalytic mechanism, suppression of MgO rock salt formation is identified to be a key step where the role of CeHx/CeOx interfaces gains more importance.
publishDate 2022
dc.date.none.fl_str_mv 2022-08-01T00:00:00Z
2022-08
2024-08-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10773/35842
url http://hdl.handle.net/10773/35842
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0360-3199
10.1016/j.ijhydene.2022.06.228
dc.rights.driver.fl_str_mv info:eu-repo/semantics/embargoedAccess
eu_rights_str_mv embargoedAccess
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:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
_version_ 1799137722463420416