Double perovskite (La2-xCa-Bax)NiO4 oxygen carriers for chemical looping reforming applications

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dc.contributor.authorMelo, Marcus Antônio de Freitas
dc.contributor.authorMedeiros, Rodolfo Luiz Bezerra de Araújo
dc.contributor.authorMelo, Vítor Rodrigo de Melo e
dc.contributor.authorMelo, Dulce Maria de Araújo
dc.contributor.authorMacedo, Heloísa Pimenta de
dc.contributor.authorMoure, Gustavo Torres
dc.contributor.authorAdánez-Rubio, Iñaki
dc.contributor.authorAdánez, Juan
dc.date.accessioned2021-12-08T13:29:05Z
dc.date.available2021-12-08T13:29:05Z
dc.date.issued2020-01-13
dc.description.resumoDouble perovskites La2-xNiO4-δ doped with Ca and Ba were synthesized via microwave-assisted combustion method and studied as an alternative oxygen carrier (OC) for chemical looping reforming processes (CLR). The OCs, La2NiO4, La1.8Ca0.2NiO4, La1.8Ba0.2NiO4 and La1.8Ca0.1Ba0.1NiO4 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), temperature-programmed reduction and oxidation (TPR/TPO) and cyclic thermogravimetric analysis (TGA). Rietveld's refinement, performed after each redox cycle, confirmed that doping allows smaller amounts of nickel to migrate from the perovskite structure. The double perovskites synthesized for the chemical looping reforming process behave as simple nickel oxide and are considered as alternative oxygen carriers to solve the problems of deactivation due to the interaction of NiO with the support. The Ca-doped OC (La1.8Ca0.2NiO4) showed lower NiO concentration outside the structure and smaller crystallite size after the redox cycles, which was associated with a change in the crystal structure, presenting superior performance and stability. The results show that all perovskites have high reactivity in both reduction and oxidation reactions, however the perovskites were not able to uncouple oxygen, which is an unsual behavior for perovskitespt_BR
dc.identifier.citationMEDEIROS, R. L. B. A.; MELO, V. R. M.; MELO, D. M. A.; MACEDO, H. P.; MOURE, G. T.; ADÁNEZ-RUBIO, I.; MELO, M. A. F.; ADÁNEZ, J.. Double perovskite (La2-xCa-Bax)NiO4 oxygen carriers for chemical looping reforming applications. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 45, p. 1681-1696, 2019. Disponível em: https://www.sciencedirect.com/science/article/pii/S0360319919341485. Acesso em: 05 out 2021. https://doi.org/10.1016/j.ijhydene.2019.11.004pt_BR
dc.identifier.doi10.1016/j.ijhydene.2019.11.004
dc.identifier.issn0360-3199
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/45274
dc.languageenpt_BR
dc.publisherElsevierpt_BR
dc.subjectLa2NiO4pt_BR
dc.subjectOxygen carrierpt_BR
dc.subjectChemical loopingpt_BR
dc.subjectMicrowave combustionpt_BR
dc.subjectRietveld refinementpt_BR
dc.subjectHydrogenpt_BR
dc.titleDouble perovskite (La2-xCa-Bax)NiO4 oxygen carriers for chemical looping reforming applicationspt_BR
dc.typearticlept_BR

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