Please use this identifier to cite or link to this item:
http://www.repositorio.ufop.br/jspui/handle/123456789/7843
Title: | Amorphization effects on the basic sites of nanometric magnesium oxide. |
Authors: | Carreño, Neftalí Lenin Villarreal Keyson, David Escote, Marcia Tsuyama Leite, Edson Roberto Longo, Elson Fajardo, Humberto Vieira Probst, Luiz Fernando Dias Valentini, Antoninho Joya, Miryam Rincón Pizani, Paulo Sergio |
Keywords: | Magnesium oxide Amorphization Photoluminescence Catalysts |
Issue Date: | 2008 |
Citation: | CARREÑO, 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. |
Abstract: | The 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. |
URI: | http://www.repositorio.ufop.br/handle/123456789/7843 |
metadata.dc.identifier.uri2: | http://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=49337 |
ISSN: | 1334-417X |
Appears in Collections: | DEQUI - Artigos publicados em periódicos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
ARTIGO_AmorphizationEffectsBasic.pdf Restricted Access | 460 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.