Amorphization effects on the basic sites of nanometric magnesium oxide.

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dc.contributor.authorCarreño, Neftalí Lenin Villarreal
dc.contributor.authorKeyson, David
dc.contributor.authorEscote, Marcia Tsuyama
dc.contributor.authorLeite, Edson Roberto
dc.contributor.authorLongo, Elson
dc.contributor.authorFajardo, Humberto Vieira
dc.contributor.authorProbst, Luiz Fernando Dias
dc.contributor.authorValentini, Antoninho
dc.contributor.authorJoya, Miryam Rincón
dc.contributor.authorPizani, Paulo Sergio
dc.date.accessioned2017-06-01T15:23:29Z
dc.date.available2017-06-01T15:23:29Z
dc.date.issued2008
dc.description.abstractThe paper reports the catalytic action of the basic sites of nanocrystalline particles of rare earth-doped magnesium oxide in the aldolization reaction between acetone and methanol leading to the C–C bond formation of an a,b-unsaturated compound (methyl vinyl ketone), also forming methyl ethyl ketone and isopropyl alcohol. Undoped and doped MgO samples were prepared by high-energy mechanical milling of commercial Mg, Y and Ce oxide powders. Catalytic activity and surface basicity of these compounds were strongly influenced by doping and the time of mechanical milling (amorphization process). Such milling leads to the formation of nanocrystalline materials. Influence of mechanical processing of these compounds was investigated by means of N2 adsorption (BET), X-ray diffraction (XRD), TEM, CO2 chemisorption and room temperature photoluminescence emission. Strong changes of polar groups such as hydroxyl groups on the surface of the solid were directly related to the photoluminescence emission observed.pt_BR
dc.identifier.citationCARREÑO, N. L. V. et al. Amorphization effects on the basic sites of nanometric magnesium oxide. Croatica Chemica Acta, v. 81, p. 443-451, 2008. Disponível em: <http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=49337>. Acesso em: 20 abr. 2017.pt_BR
dc.identifier.issn1334-417X
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/7843
dc.identifier.uri2http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=49337pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectMagnesium oxidept_BR
dc.subjectAmorphizationpt_BR
dc.subjectPhotoluminescencept_BR
dc.subjectCatalystspt_BR
dc.titleAmorphization effects on the basic sites of nanometric magnesium oxide.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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