Síntese da liga de Fe-Co pelo método de esferas híbridas utilizando Carboximetilcelulose como direcionador e sua aplicação em catálise
Hybrid spheres is confirmed to be an efficient method in the synthesis of Fe-Co alloy. The carboxymethylcellulose-based organic precursor (CMC) was added dropwise to a solution containing Fe3+ and Co2+, leading to the formation of the hybrid spheres from the complexation of the metal cations with...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/30827 |
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| Resumo: | Hybrid spheres is confirmed to be an efficient method in the synthesis of Fe-Co alloy.
The carboxymethylcellulose-based organic precursor (CMC) was added dropwise to a
solution containing Fe3+ and Co2+, leading to the formation of the hybrid spheres from
the complexation of the metal cations with the radicals present in the biopolymer
(crosslinking process). The hybrid spheres were calcined in air atmosphere leading to the
formation of Fe and Co based oxide. After, it was reduced with H2 flow to form the FeCo
alloy. The alloy was applied in the ethylbenzene dehydrogenation reaction to styrene
production (high added value product). In order to characterize the obtained materials, it
was used the infrared spectroscopy (FTIR), X-ray diffraction (XRD), temperature
programmed reduction (TPR), thermogravimetric analysis (TG) and magnetometry
(VSM). FTIR confirms the complexation mechanism between metal ions and CMC and
the complete oxidation of the biopolymer after calcination. The diffractograms and TPR
confirm the formation of the FeCo alloy after reduction under H2 atmosphere. TG
indicates the minimum temperature at which the alloy is oxidized, confirming the
chemical resistance of the FeCo alloy against the oxidizing atmosphere. The magnetic
hysteresis curves confirm the ferromagnetic nature of the FeCo alloy. The ethylbenzene
dehydrogenation reaction was selective for the formation of styrene, according to gas
chromatography (GC), in the presence of the FeCo alloy, confirming the interesting
properties of the iron-based catalysts for dehydrogenation reactions. |
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