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Gold catalysts for the synthesis of aromatic azocompounds from nitroaromatics in one step

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Gold catalysts for the synthesis of aromatic azocompounds from nitroaromatics in one step

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dc.contributor.author Cómbita Merchán, Diego Fernando es_ES
dc.contributor.author Concepción Heydorn, Patricia es_ES
dc.contributor.author Corma Canós, Avelino es_ES
dc.date.accessioned 2016-04-08T10:46:14Z
dc.date.available 2016-04-08T10:46:14Z
dc.date.issued 2014-03
dc.identifier.issn 0021-9517
dc.identifier.uri http://hdl.handle.net/10251/62368
dc.description.abstract [EN] One-step selective hydrogenation of nitroaromatics to obtain symmetric azocompounds with high yields has been performed with a gold supported on cerium oxide catalysts. Au/TiO2 and Au/CeO2 catalysts direct the reaction by two different pathways and with different selectivities. In situ FTIR studies reveal that the surface concentration of the intermediate nitrosobenzene is decisive in directing the reaction trough the different reaction pathways. In this way, while on Au/TiO2 a fast hydrogenation of the nitrosobenzene intermediate leads to a low surface concentration of the nitrosocompound, on Au/CeO2 nitrosobenzene is more stabilized on the catalyst surface leading to a lower hydrogenation and a higher coupling rate, resulting in high selectivities to azobenzene. On Au/CeO2, the relative weak adsorption of the azo with respect to the azoxycompound on the catalyst surface avoids the consecutive hydrogenation of azocompounds to the corresponding anilines until all the azoxy has been consumed. Asymmetric azobenzenes have also been obtained with very high yields on TiO2, through the Mills reaction. es_ES
dc.description.sponsorship The authors wish to acknowledge the financial support from the Spanish Ministries of Education and Science and Economy and Competitiveness under the project Consolider-Ingenio 2010 (CSD2009-00050 "Development of more efficient catalysts for the design of sustainable chemical processes and clean energy production") and the Severo Ochoa program (SEV-2012-0267), respectively. D.C. thanks the Spanish MEC for postgraduate scholarship, project MAT2006-14274-C02-01.
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation MINECO/CSD2009-00050 es_ES
dc.relation MICINN/SEV-2012-0267 es_ES
dc.relation MEC/MAT2006-14274-C02-01 es_ES
dc.relation.ispartof Journal of Catalysis es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Azocompounds es_ES
dc.subject Nitroaromatics reduction es_ES
dc.subject Heterogeneous catalysts es_ES
dc.subject Gold catalysts es_ES
dc.subject Hydrogenation es_ES
dc.subject.classification QUIMICA ORGANICA es_ES
dc.title Gold catalysts for the synthesis of aromatic azocompounds from nitroaromatics in one step es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.jcat.2013.12.014
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Química - Departament de Química es_ES
dc.description.bibliographicCitation Combita Merchán, DF.; Concepción Heydorn, P.; Corma Canós, A. (2014). Gold catalysts for the synthesis of aromatic azocompounds from nitroaromatics in one step. Journal of Catalysis. 311:339-349. doi:10.1016/j.jcat.2013.12.014 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://dx.doi.org/10.1016/j.jcat.2013.12.014 es_ES
dc.description.upvformatpinicio 339 es_ES
dc.description.upvformatpfin 349 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 311 es_ES
dc.relation.senia 279920 es_ES
dc.identifier.eissn 1090-2694
dc.contributor.funder Ministerio de Economía y Competitividad
dc.contributor.funder Ministerio de Educación y Ciencia
dc.contributor.funder Ministerio de Ciencia e Innovación


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