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Styrene oxidation to valuable compounds over nanosized FeCo-based catalysts: ef...
Oliveira, Ana Paula Saraiva; Gomes, Igor Santos; Oliveira, Alcineia Conceição; Mendes Filho, Josué; Saraiva, Gilberto Dantas; Soares, João MariaNanosized FeCo-based solids were prepared via distinct preparation procedures. The catalytic performances of the solids for styrene oxidation in the presence of hydrogen peroxide were evaluated. The addition of promoters in FeCo such as Sn, Mo, or Cu was also investigated. The catalysts were characterized with XRD, Raman spectroscopy, TEM, chemical analyses, EPR and SEM-EDS. Of these solids obtained via four di...
Estudo de espalhamento Raman nos ácidos palmítico e esteárico: forma C
Sousa, Francisco Ferreira deIn this work vibrational properties of crystals of palmitic and stearic acids have been studied by Raman spectroscopy. Initially we were able to crystallize the fatty acids using the method of slow evaporation of the solvent. Two solvents with di®erent levels of polarity (ethanol and chloroform) were used at two di®erent controlled temperatures at » 16 ±C and another at » 0 ±C. Thus, we obtained single crystals...