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dc.contributor.authorDas, Dipak
dc.contributor.authorPal, Kamalesh
dc.contributor.authorLlorca Piqué, Jordi
dc.contributor.authorDomínguez Escalante, Montserrat
dc.contributor.authorColussi, Sara
dc.contributor.authorTrovarelli, Alessandro
dc.contributor.authorGayen, Arup
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2017-09-29T07:01:47Z
dc.date.available2017-09-29T07:01:47Z
dc.date.issued2017-10-01
dc.identifier.citationDas, D., Pal, K., Llorca, J., Dominguez, M., Colussi, S., Trovarelli, A., Gayen, A. Chemoselective hydrogenation of cinnamaldehyde at atmospheric pressure over combustion synthesized Pd catalysts. "Reaction kinetics mechanisms and catalysis", 1 Octubre 2017, vol. 122, núm. 1, p. 135-153.
dc.identifier.issn1878-5190
dc.identifier.urihttp://hdl.handle.net/2117/108132
dc.description.abstractA series of Pd-supported metal oxides (Al2O3, Fe2O3 and CeO2) have been prepared by a single step solution combustion synthesis (SCS) method. Their catalytic performance was evaluated for the selective hydrogenation of cinnamaldehyde (CAL) to hydrocinnamaldehyde (HCAL) under atmospheric pressure of hydrogen at 100 °C. Among these materials, combustion synthesized Pd (2 at.%)/Al2O3 catalyst exhibits the highest CAL conversion (69%) with complete HCAL selectivity. The analogous catalyst prepared by the incipient wetness impregnation (IWI) method shows an initially similar activity. X-ray diffraction and high resolution transmission electron microscopy analyses of the as prepared SCS sample show fine dispersion of PdO over the ¿-Al2O3 support. On ageing, a major portion of PdO is reduced to metallic Pd (Pd2+:Pd0 = 36:64 for the SCS catalyst and Pd2+:Pd0 = 26:74 for the IWI catalyst from X-ray photoelectron spectroscopy studies) suggesting comparatively more ionic character of palladium in the SCS catalyst. In the hydrogen atmosphere, without distinguishing the reductive pretreatment of catalyst and the beginning of hydrogenation subsequent to CAL addition, the Pd-species undergoes rearrangement to form a core–shell like structure of Pd (core)–PdO (periphery) covered with alumina layer, bringing in additional stability to the Pd-species in the SCS catalyst and making it highly recyclable. The analogous IWI catalyst, on the contrary, contains a mixed Pd–PdO ensemble that does not increase the stability causing continuous loss of activity in the consecutive cycles of hydrogenation.
dc.format.extent19 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Enginyeria química
dc.subject.lcshPalladium
dc.subject.lcshAlumina
dc.subject.lcshCatalysts
dc.subject.otherPalladium
dc.subject.otherAlumina
dc.subject.otherAtmospheric pressure hydrogenation
dc.subject.otherCinnamaldehyde
dc.subject.otherHydrocinnamaldehyde
dc.titleChemoselective hydrogenation of cinnamaldehyde at atmospheric pressure over combustion synthesized Pd catalysts
dc.typeArticle
dc.subject.lemacCatalitzadors
dc.contributor.groupUniversitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia
dc.identifier.doi10.1007/s11144-017-1228-5
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://link.springer.com/article/10.1007%2Fs11144-017-1228-5
dc.rights.accessOpen Access
drac.iddocument21544574
dc.description.versionPostprint (author's final draft)
upcommons.citation.authorDas, D., Pal, K., Llorca, J., Dominguez, M., Colussi, S., Trovarelli, A., Gayen, A.
upcommons.citation.publishedtrue
upcommons.citation.publicationNameReaction kinetics mechanisms and catalysis
upcommons.citation.volume122
upcommons.citation.number1
upcommons.citation.startingPage135
upcommons.citation.endingPage153


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