Liquid-phase selective hydrogenation of hexa-1,5-diene and hexa-1,3-diene on palladium catalysts. Effect of tin and silver addition

dc.creatorSales, EA
dc.creatorMendes, MD
dc.creatorBozon-Verduraz, F
dc.date2000
dc.dateOCT 1
dc.date2014-12-02T16:27:37Z
dc.date2015-11-26T18:06:39Z
dc.date2014-12-02T16:27:37Z
dc.date2015-11-26T18:06:39Z
dc.date.accessioned2018-03-29T00:48:50Z
dc.date.available2018-03-29T00:48:50Z
dc.identifierJournal Of Catalysis. Academic Press Inc, v. 195, n. 1, n. 96, n. 105, 2000.
dc.identifier0021-9517
dc.identifierWOS:000089835100012
dc.identifier10.1006/jcat.2000.2966
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/52419
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/52419
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/52419
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1293408
dc.descriptionThe liquid-phase hydrogenation of hexa-1,5-diene and hexa-1,3-diene on alumina-supported palladium catalysts is investigated with special attention paid to the effects of tin or silver addition. All catalysts show a global selectivity near 100%; these high values persist at total conversion when the reactant is hexa-1,3-diene but decrease to about 70% in the case of hexa-1,5-diene. In the hexa-1,5-diene hydrogenation, monometallic palladium catalysts give mainly 1-hexene at conversions lower than 80% and E-hex-2-ene at higher conversions. The fractional selectivity to 1-hexene is significantly improved by tin or silver addition; however, significant yields are observed only on Pd-Sn catalysts with a low Sn/Pd atomic ratio (approximate to 0.1) and when the intermetallic compound Pd3Sn is present. On the other hand, in the hexa-1,3-diene hydrogenation, hex-1-ene is preferentially formed on monometallic catalysts with low dispersion; on bimetallic Pd-Sn or Pd-Ag catalysts, the selectivity to E-hex-3-ene is enhanced and this isomer is even predominant up to 100% conversion on the Pd-Sn catalysts containing the Pd3Sn intermetallic compound. These results are explained by the geometric effect of dilution of Pd atoms, which delays the palladium double-bond isomerization ability. The proposed mechanism suggests that strongly adsorbed alkadienes react with dissolved hydrogen, following a zero-order kinetics. (C) 2000 Academic Press.
dc.description195
dc.description1
dc.description96
dc.description105
dc.languageen
dc.publisherAcademic Press Inc
dc.publisherSan Diego
dc.publisherEUA
dc.relationJournal Of Catalysis
dc.relationJ. Catal.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectPd catalysts
dc.subjectPdSn catalysts
dc.subjectPd-Ag catalysts
dc.subjectselective hydrogenation
dc.subjecthexa-1,5-diene
dc.subjecthexa-1,3-diene
dc.subjectAlumina-supported Pd
dc.subjectAcetylene Hydrogenation
dc.subjectParticle-size
dc.subject1,3-butadiene Hydrogenation
dc.subjectAg Catalysts
dc.subjectReactivity
dc.subjectPlatinum
dc.subjectPd/al2o3
dc.titleLiquid-phase selective hydrogenation of hexa-1,5-diene and hexa-1,3-diene on palladium catalysts. Effect of tin and silver addition
dc.typeArtículos de revistas


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