Estudio por XPS y TGA de nanocatalizadores de hierro soportados sobre silicio bajo tratamientos térmicos, en oxígeno e hidrógeno

dc.contributores-ES
dc.creatorTorres, Heberth
dc.creatorCasanova Bautista, Rodrigo
dc.creatorMendialdua L., Juan A.
dc.creatorMichelangeli, Ela
dc.creatorRueda, Fulgencio
dc.creatorValera, José C.
dc.creatorRodríguez, Alfonso
dc.creatorLoaiza Gil, Alfonso de Jesús
dc.creatorHoffmann Bednarski, Pedro Esteban
dc.creatorLobo Briceño, José Alirio
dc.creatorColmenares, Keibys E.
dc.date2009-12-10
dc.date.accessioned2022-11-04T18:43:08Z
dc.date.available2022-11-04T18:43:08Z
dc.identifierhttp://erevistas.saber.ula.ve/index.php/memoriasula/article/view/154
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/5127253
dc.descriptionUltra-fine particle sized and well dispersed catalysts, pH=5 and pH=11, were prepared using Barbier et Al´s modified method. The catalysts were studied using TGA and XPS techniques. The TGA curves, under hydrogen flow show a weight loss at 300oC, which could correspond to the transformation of a small fraction of Fe2O3 to metallic iron. However, XPS results show that the iron oxidation state (+3) in these catalysts do not change during the sample thermal treatments in O2, H2 and in vacuum, but its chemical environment is definetely modified. The last behavior can be clearly observed in the evolution experienced by the Fe2p3/2 shake-up which is related to the valence energy levels. The apparent contradiction between XPS and TGA results could be related to the iron coordination state in this particular sample.es-ES
dc.formatapplication/pdf
dc.languagespa
dc.publisherUniversidad de Los Andeses-ES
dc.relationhttp://erevistas.saber.ula.ve/index.php/memoriasula/article/view/154/183
dc.sourceMemorias de la ULA; Núm. 2 (2): VI Congreso de la Sociedad Venezolana de Físicaes-ES
dc.subjectXPS, TGA, Hierro, Catalizadores, Shake-upes-ES
dc.titleEstudio por XPS y TGA de nanocatalizadores de hierro soportados sobre silicio bajo tratamientos térmicos, en oxígeno e hidrógenoes-ES
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typees-ES


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