Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/106333
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dc.creatorSónia A. C. Carabineiro
dc.creatorVera P. Santos
dc.creatorM. Fernando R. Pereira
dc.creatorJosé J. M. Orfão
dc.creatorJosé L. Figueiredo
dc.date.accessioned2019-06-07T23:11:03Z-
dc.date.available2019-06-07T23:11:03Z-
dc.date.issued2016
dc.identifier.issn0021-9797
dc.identifier.othersigarra:139247
dc.identifier.urihttps://hdl.handle.net/10216/106333-
dc.description.abstractCryptomelane-type manganese oxides were synthesized by redox reaction under acid and reflux conditions. Different metals (cesium, lithium and titanium) were incorporated into the tunnel structure by the ion-exchange technique. Gold was loaded onto these materials (1 wt%) by a double impregnation method. The obtained catalysts were characterized by high-resolution transmission electron microscopy, energy-dispersive X-ray spectrometry, scanning electron microscopy, X-ray diffraction and temperature programmed reduction. The catalytic activity of these materials was evaluated in the oxidation of carbon monoxide. The incorporation of Cs, Li or Ti into cryptomelane was detrimental in terms of catalytic activity. Further addition of gold to cryptomelane doped materials significantly improved the catalytic performance, especially for Cs-K-OMS-2 and Li-K-OMS-2 (to a smaller extent). Addition of gold to the Ti containing material did not show a significant improvement. The observed trends are related to the effect of gold on samples reducibility and to the gold particle size. The lattice oxygen can also be considered accountable for the activity of the materials, since the most active cryptomelane catalysts are those with higher lattice oxygen donating ability for the oxidation of the CO molecule.
dc.language.isoeng
dc.relationinfo:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/UID/EQU/50020/2013- POCI-01-0145-FEDER-006984/Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais/LSRE-LCM
dc.rightsrestrictedAccess
dc.titleCO oxidation over gold supported on Cs, Li and Ti-doped cryptomelane materials
dc.typeArtigo em Revista Científica Internacional
dc.contributor.uportoFaculdade de Engenharia
dc.identifier.doi10.1016/j.jcis.2016.06.072
dc.identifier.authenticusP-00K-NWZ
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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