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Carbon xerogel supported noble metal catalysts for fine chemical applications

2010Journal article Restricted access
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dc.contributor.authorMachado, Bruno
dc.contributor.authorGomes, Helder
dc.contributor.authorSerp, Philippe
dc.contributor.authorKalck, Philippe
dc.contributor.authorFigueiredo, José
dc.contributor.authorFaria, Joaquim
dc.date.accessioned2010-01-20T16:10:30Z
dc.date.available2010-01-20T16:10:30Z
dc.date.issued2010
dc.description.abstractCarbon xerogels are mesoporous materials obtained upon pyrolysis of the dried gels resulting from polycondensation of resorcinol and formaldehyde. Treatment with nitric acid under severe conditions introduces high amounts of oxygen containing functional groups onto the surface of thematerial, leading however to the collapse of its porous structure. The resulting material is then used to support 1 wt.% Pt, Ir and Ru monometallic catalysts by wet impregnation using organometallic precursors. The catalysts are characterized by N2 adsorption–desorption isotherms at 77 K, temperature programmed desorption coupled with mass spectrometry, scanning and transmission electron microscopy, and H2 chemisorption. The liquid-phase selective hydrogenation of cinnamaldehyde to cinnamyl alcohol is used in order to assess the catalytic performance of the prepared materials. Pt and Ru catalysts are initially very selective towards the hydrogenation of the olefinic double bond, while Ir is mostly selective towards the carbonyl group. After a thermal post-reduction treatment at 973 K, selectivity towards cinnamyl alcohol is significantly improved regardless of the metal nature. The Pt catalyst exhibits the best behavior, a complete shift in C=C to C=O hydrogenation being detected. The improvement in selectivity is rationalized in terms of both an increase in metal particle size and a modification in the surface chemistry of the catalyst after the post-reduction treatment.pt
dc.identifier.citationMachado, Bruno; Gomes, Helder; Serp, Philippe; Kalck, Philippe; Figueiredo, José; Faria, Joaquim (2010). Carbon xerogel supported noble metal catalysts for fine chemical applications. Catalysis Today. ISSN 0920-5861. 149:3-4, p. 358-364pt
dc.identifier.doi10.1016/j.cattod.2009.06.016
dc.identifier.issn0920-5861
dc.identifier.urihttp://hdl.handle.net/10198/1348
dc.language.isoengpt
dc.publisherElsevierpt
dc.subjectCarbon xerogelpt
dc.subjectPlatinumpt
dc.subjectIridiumpt
dc.subjectRutheniumpt
dc.subjectSelective hydrogenationpt
dc.subjectCinnamaldehydept
dc.titleCarbon xerogel supported noble metal catalysts for fine chemical applicationspt
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCI%2FEQU%2F58252%2F2004/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F16565%2F2004/PT
oaire.citation.endPage364pt
oaire.citation.startPage358pt
oaire.citation.titleCatalysis Todaypt
oaire.fundingStreamPOCI
oaire.fundingStreamSFRH
person.familyNameGomes
person.givenNameHelder
person.identifier.ciencia-id6218-1E19-13EE
person.identifier.orcid0000-0001-6898-2408
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt
rcaap.typearticlept
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relation.isAuthorOfPublication.latestForDiscovery0eb96337-224a-4339-9918-334436fbbb99
relation.isProjectOfPublication300d8f69-38b0-41ee-91bf-bd384b3dc31f
relation.isProjectOfPublication055fc313-4f99-4784-9dcb-542bf67bb04c
relation.isProjectOfPublication.latestForDiscovery055fc313-4f99-4784-9dcb-542bf67bb04c

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