https://repositorio.ufba.br/handle/ri/7282
Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Sales, Emerson Andrade | - |
dc.contributor.author | Mendes, Mario de Jesus | - |
dc.contributor.author | Bozon Verduraz, François | - |
dc.creator | Sales, Emerson Andrade | - |
dc.creator | Mendes, Mario de Jesus | - |
dc.creator | Bozon Verduraz, François | - |
dc.date.accessioned | 2012-11-26T21:11:19Z | - |
dc.date.issued | 2000-10 | - |
dc.identifier.issn | 0021-9517 | - |
dc.identifier.uri | http://www.repositorio.ufba.br/ri/handle/ri/7282 | - |
dc.description | p.96–105 | pt_BR |
dc.description.abstract | The 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 (≈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. | pt_BR |
dc.language.iso | en | pt_BR |
dc.publisher | Elsevier | pt_BR |
dc.source | http://dx.doi.org/10.1006/jcat.2000.2966 | pt_BR |
dc.subject | Pd catalysts | pt_BR |
dc.subject | Pd–Sn catalysts | pt_BR |
dc.subject | Pd–Ag catalysts | pt_BR |
dc.subject | Selective hydrogenation | pt_BR |
dc.subject | Hexa-1,5-diene | pt_BR |
dc.subject | Hexa-1,3-diene | pt_BR |
dc.title | Liquid-Phase Selective Hydrogenation of Hexa-1,5-diene and Hexa-1,3-diene on Palladium Catalysts. Effect of Tin and Silver Addition | pt_BR |
dc.title.alternative | Journal of Catalysis | pt_BR |
dc.type | Artigo de Periódico | pt_BR |
dc.identifier.number | v. 195, n. 1 | pt_BR |
dc.embargo.liftdate | 10000-01-01 | - |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
Arquivo | Descrição | Tamanho | Formato | |
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Sales.pdf Restricted Access | 133,77 kB | Adobe PDF | Visualizar/Abrir Solicitar uma cópia |
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