CARLOS ALBERTO DA SILVA QUEIROZ
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Resumo IPEN-doc 12511 Characterization of lanthanium oxide on the thermal stability of gamma alumina catalyst supports2007 - ROCHA, S.M.R.; VASCONCELLOS, M.E. de; QUEIROZ, C.A.S.; FORBICINI, C.A.L.G.O.; SENEDA, J.A.; PEDREIRA, W.R.Artigo IPEN-doc 19322 High purity samarium oxide from mixed rare earth carbonates2013 - QUEIROZ, CARLOS A. da S.; PEDREIRA FILHO, WALTER dos R.; SENEDA, JOSE A.; VASCONCELLOS, MARI E. deArtigo IPEN-doc 08844 Recuperacao de torio como nitrato 'mantle grade' usando-se um hidroxido de torio bruto2002 - VASCONCELLOS, M.E.; QUEIROZ, C.A.S.; ABRAO, A.Artigo IPEN-doc 08843 Produção de lantânio de alta pureza para aplicação em P&D2002 - VASCONCELLOS, M.E.; QUEIROZ, C.A.S.; ROCHA, S.M.R.; SENEDA, J.A.; PEDREIRA FILHO, W.R.; SARKIS, J.E.S.; FORBICINI, C.A.L.G.O.; ABRAO, A.Artigo IPEN-doc 19853 High purity samarium acetate from mixed rare earth carbonates2013 - QUEIROZ, CARLOS A. da S.; SENEDA, JOSE A.; PEDREIRA, WALTER dos R.; VASCONCELLOS, MARI E. deArtigo IPEN-doc 08605 Thermoanalytical characterization of neodymium peroxicarbonate2001 - QUEIROZ, C.A.S.; MATOS, J.R.; VASCONCELLOS, M.E.; ABRAO, A.This paper presents the data collected for the neodymium peroxicarbonate by thermogravimetry (TG)–differential thermogravimetry (DTG), active oxygen determination via iodine generation and total oxide content by gravimetry and elementary analysis of CHN by microanalyses. By thermal analysis (DTG) a mass loss corresponding to volatile components and water, equivalent to 27.65% of the total mass was observed. This value is in accordance with the mass loss of the compound when it was fired at 900 °C toward the Nd2O3 oxide. With the DTG program a process of thermodecomposition in multisteps, was observed, corresponding to the loss of water (up to 250 °C), evolution of oxygen gas from the peroxide compound and a partial decomposition to CO2 (250 to 600 °C) and a second evolution of CO2 (from 600 to 900 °C). This final evolution of CO2 probably came from the intermediary compound Nd2O2CO3. By microanalyses the carbon and hydrogen contents were 4.8 and 1.0%, respectively. In summary, the analytical data collected allowed one to conclude that the stoichiometric formula for the studied compound is Nd2O2(CO3)2·2H2O.Artigo IPEN-doc 16972 High purity neodymium acetate from mixed rare earth carbonates2011 - QUEIROZ, CARLOS A. da S.; ROCHA, SORAYA M.R. da; PEDREIRA, WALTER dos R.; VASCONCELLOS, MARI E. de; LOBO, RAQUEL M.; SENEDA, JOSE A.Artigo IPEN-doc 11985 Study on radiogenic lead recovery from residues in thorium facilities using ion exhange anb electrochemical process2007 - SENEDA, JOSE A.; FORBICINI, CHRISTINA A.L.G. de O.; QUEIROZ, CARLOS A. da S.; VASCONCELLOS, MARI E. de; FORBICINI, SERGIO; RIZZO, SORAYA M. da R.; ABRAO, ALCIDIOArtigo IPEN-doc 10268 Sequential separation of the yttrium-heavy rare earths by fractional2003 - VASCONCELLOS, M.E.; QUEIROZ, C.A.S.; ABRAO, A.Artigo IPEN-doc 10270 Synthesis and thermoanalytical characterization of samarium peroxocarbonate2003 - QUEIROZ, C.A.S.; VASCONCELLOS, M.E.; ROCHA, S.M.R.; SENEDA, J.A.; PEDREIRA, W.R.; MATOS, J.R.; ABRAO, A.