Chemical and physical changes related to the deactivation of alumina used in catalytic epoxidation with hydrogen peroxide

dc.creatorRinaldi, R
dc.creatorFujiwara, FY
dc.creatorSchuchardt, U
dc.date2007
dc.date45658
dc.date2014-11-18T13:04:55Z
dc.date2015-11-26T17:50:28Z
dc.date2014-11-18T13:04:55Z
dc.date2015-11-26T17:50:28Z
dc.date.accessioned2018-03-29T00:33:42Z
dc.date.available2018-03-29T00:33:42Z
dc.identifierJournal Of Catalysis. Academic Press Inc Elsevier Science, v. 245, n. 2, n. 456, n. 465, 2007.
dc.identifier0021-9517
dc.identifierWOS:000243798400021
dc.identifier10.1016/j.jcat.2006.11.011
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/62968
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/62968
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/62968
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1289690
dc.descriptionThis report addresses several questions regarding the deactivation of alumina in catalytic epoxidation using aqueous 70% H2O2, The structural, textural, morphological, and chemical changes of a polycrystalline alumina (gamma-Al2O3 and boehmite) were studied in five consecutives reactions of 24 It. The chemical and physical processes involved in the transformations during alumina recycling are attributed mainly to the presence of water in the reaction mixture. Water plays a dual role in the catalytic system. On the one hand, water may cause deleterious changes of the structure of gamma-Al2O3 and its textural properties. On the other hand, the presence of water shifts the adsorption equilibria of the organic molecules (acetic acid, diols, and oligomers), preserving the type la Al-OH sites, which are active for catalytic epoxidation. In this way, the water in the alumina/H2O2 catalytic system seems to be significant in prolonging the lifetime of the catalyst. (c) 2006 Elsevier Inc. All rights reserved.
dc.description245
dc.description2
dc.description456
dc.description465
dc.languageen
dc.publisherAcademic Press Inc Elsevier Science
dc.publisherSan Diego
dc.publisherEUA
dc.relationJournal Of Catalysis
dc.relationJ. Catal.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectcatalyst deactivation
dc.subjectalumina
dc.subjectepoxidation
dc.subjecthydrogen peroxide
dc.subjectsolid-state NMR
dc.subjectLiquid-phase Oxidations
dc.subjectSol-gel Alumina
dc.subjectHeterogeneous Catalysts
dc.subjectGamma-alumina
dc.subjectBoehmite
dc.subjectSpectroscopy
dc.subjectReactivity
dc.subjectInterface
dc.subjectWater
dc.subjectH2o2
dc.titleChemical and physical changes related to the deactivation of alumina used in catalytic epoxidation with hydrogen peroxide
dc.typeArtículos de revistas


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