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Electrical conductivity of a MoVTeNbO catalyst in propene oxidation measured in operando conditions

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Electrical conductivity of a MoVTeNbO catalyst in propene oxidation measured in operando conditions

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dc.contributor.author Caldararu, M. es_ES
dc.contributor.author Scurtu, M. es_ES
dc.contributor.author Hornoiu, C. es_ES
dc.contributor.author Munteanu, C. es_ES
dc.contributor.author Blasco Lanzuela, Teresa es_ES
dc.contributor.author López Nieto, José Manuel es_ES
dc.date.accessioned 2016-10-13T10:10:33Z
dc.date.available 2016-10-13T10:10:33Z
dc.date.issued 2010-10-15
dc.identifier.issn 0920-5861
dc.identifier.uri http://hdl.handle.net/10251/71710
dc.description.abstract [EN] A complex ac electrical conductivity study was performed on a Te(0.33)MO(3.33) (M = Mo + V + Nb) pure phase (M2-type phase) in operando conditions, using the differential step technique (DST). The aim is to obtain new information about the influence of the oxidation and moisture on the catalytic behaviour of this phase in propene oxidation to acrylic acid. Three successive series of experiments were performed on the same batch of sample: (i) cycles of heating (up to 300, 350 and 400 degrees C, respectively)-cooling (to room temperature) in inert and in the catalytic test mixture, without intermediate oxidation; (ii) the same, but intercalating heating-cooling oxidation cycles (up to 300, 350 and 400 degrees C, respectively) before the corresponding catalytic test runs; and (iii) catalytic testing runs performed by heating up to 400 degrees C in the presence of pre-absorbed or co-adsorbed humidity. Based on the electrical conductivity results, it appears that 350 degrees C is a critical temperature in terms of surface reduction/re-oxidation: below this temperature no major surface changes of the relative oxidation level occur on flushing in dry helium or in the catalytic test mixture, while above it, an important reduction occurs in the same atmospheres. Re-oxidation in oxygen is not efficient if performed below 350 degrees C, but if done above (up to 400 degrees C) the surface recovers almost the initial behaviour. These results suggest the reversibility of the oxidation state of the catalyst surface, which is important in the practical use of this material. The activity and selectivity of acrylic acid formation are discussed in relation with the relative levels of oxidation/reduction of the surface. (C) 2010 Elsevier B.V. All rights reserved. es_ES
dc.description.sponsorship T.B. and J.M.L.N thank for the financial support from DGICYT in Spain through Project CTQ2006-09358/BQU).
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof Catalysis Today es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Electrical conductivity es_ES
dc.subject MoVTeNb-phase es_ES
dc.subject Propene oxidation es_ES
dc.subject Acrylic acid es_ES
dc.subject Surface reduction/oxidation es_ES
dc.subject Effect of moisture es_ES
dc.title Electrical conductivity of a MoVTeNbO catalyst in propene oxidation measured in operando conditions es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.cattod.2010.01.045
dc.relation.projectID info:eu-repo/grantAgreement/MEC//CTQ2006-09358/ES/DESARROLLO DE CATALIZADORES MULTIFUNCIONALES PARA UN PROCESO ECO-EFICIENTE BASADO EN LA OXIDACION SELECTIVA EN FASE GASEOSA DE ISOBUTANO/ es_ES
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química es_ES
dc.description.bibliographicCitation Caldararu, M.; Scurtu, M.; Hornoiu, C.; Munteanu, C.; Blasco Lanzuela, T.; López Nieto, JM. (2010). Electrical conductivity of a MoVTeNbO catalyst in propene oxidation measured in operando conditions. Catalysis Today. 155(3-4):311-318. https://doi.org/10.1016/j.cattod.2010.01.045 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://dx.doi.org/10.1016/j.cattod.2010.01.045 es_ES
dc.description.upvformatpinicio 311 es_ES
dc.description.upvformatpfin 318 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 155 es_ES
dc.description.issue 3-4 es_ES
dc.relation.senia 40748 es_ES
dc.contributor.funder Ministerio de Educación y Ciencia


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