dc.contributor.author | Choya Atencia, Andoni | |
dc.contributor.author | De Rivas Martín, Beatriz | |
dc.contributor.author | Gutiérrez Ortiz, José Ignacio | |
dc.contributor.author | López Fonseca, Rubén | |
dc.date.accessioned | 2019-04-01T14:46:48Z | |
dc.date.available | 2019-04-01T14:46:48Z | |
dc.date.issued | 2018-09-29 | |
dc.identifier.citation | Catalysts 8(10) : (2018) // Article ID 427 | es_ES |
dc.identifier.issn | 2073-4344 | |
dc.identifier.uri | http://hdl.handle.net/10810/32301 | |
dc.description.abstract | The effect of the presence of residual sodium (0.4 %wt) over a Co3O4 bulk catalyst for methane combustion was studied. Two samples, with and without residual sodium, were synthesized by precipitation and thoroughly characterised by X-ray diffraction (XRD), N-2 physisorption, Wavelength Dispersive X-ray Fluorescence (WDXRF), temperature-programmed reduction with hydrogen followed by temperature-programmed reduction with oxygen (H-2-TPR/O-2-TPO), temperature-programmed reaction with methane (CH4 -TPRe), ultraviolet-visible-near-infrared diffuse reflectance spectroscopy (UV-vis-NIR DRS), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that during calcination, a fraction of the sodium atoms initially deposited on the surface diffused and migrated into the spinel lattice, inducing a distortion that improved its textural and structural properties. However, surface sodium had an overall negative impact on the catalytic activity. It led to a reduction of surface Co3+ ions in favour of Co2+, thus ultimately decreasing the Co3+/Co2+ molar ratio (from 1.96 to 1.20) and decreasing the amount and mobility of active lattice oxygen species. As a result, the catalyst with residual sodium (T-90 = 545 degrees C) was notably less active than its clean counterpart (T-90 = 500 degrees C). All of this outlined the significance of a proper washing when synthesizing Co3O4 catalyst using a sodium salt as the precipitating agent. | es_ES |
dc.description.sponsorship | This research was funded by the Ministry of Economy and Competitiveness grant number [CTQ2016-80253-R] and the University of the Basque Country UPV/EHU (PIF15/335). | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | MDPI | es_ES |
dc.relation | info:eu-repo/grantAgreement/MINECO/CTQ2016-80253-R | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | * |
dc.subject | methane | es_ES |
dc.subject | catalytic oxidation | es_ES |
dc.subject | cobalt oxide | es_ES |
dc.subject | residual sodium | es_ES |
dc.subject | thermal stability | es_ES |
dc.subject | cobalt oxide catalysts | es_ES |
dc.subject | total oxidation | es_ES |
dc.subject | emissions abatement | es_ES |
dc.subject | N2O decomposition | es_ES |
dc.subject | no decomposition | es_ES |
dc.subject | nanoparticles | es_ES |
dc.subject | performance | es_ES |
dc.subject | behavior | es_ES |
dc.subject | account | es_ES |
dc.subject | MN | es_ES |
dc.title | Effect of Residual Na+ on the Combustion of Methane over Co3O4 Bulk Catalysts Prepared by Precipitation | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.relation.publisherversion | https://www.mdpi.com/2073-4344/8/10/427 | es_ES |
dc.identifier.doi | 10.3390/catal8100427 | |
dc.departamentoes | Ingeniería química | es_ES |
dc.departamentoeu | Ingeniaritza kimikoa | es_ES |