Síntese in situ da liga de FeCo altamente estável encapsulada em carbono a partir do etanol
type: CreativeWork
description: This research proposed to develop a FeCo magnetic alloy encapsulated in carbon, using ethanol as a carbon precursor, through the CVD route, for the photocatalytic degradation of organic contaminants. Initially, a CoxFeyO4 oxide in a 1:1 ratio was synthesized using the Pechini method. The material was subjected to in situ reduction, by the CVD method, using ethanol as the initial reagent at temperatures of 400, 500, 600 and 700ºC. The reactions were studied by Gas Chromatography (GC), from gas aliquots collected at predetermined times. From the ethanol dehydrogenation and dehydration reactions, it is transformed into an encapsulated binder and, for comparative purposes, it is reduced to oxide in the pure FeCo binder using only H2. You are materialized by a characterized and interpreted result. From the analysis of XRD and Rietveld Refinement, it is possible to identify the phases present without CoxFeyO4 oxide, as well as the presence of crystalline carbon and FeCo phases in reduced materials via CVD, whose peak intensity increases with the synthesis temperature. Thus, we show FeCo-400 and FeCo-700 were treated in acidic and alkaline medium and we verified the importance of encapsulation for the stability of the FeCo bond. TGA profiles indicate an increase in the thermal stability of the bond as the local temperature is raised. Magnetic measurements performed for the FeCo, FeCo-400 and FeCo-700 samples reveal a reduction in the more values due to the presence of the carbon phase, as well as showing high Hc values compared to the FeCo Bond, especially for an It presents FeCo-400, which may be associated with the existence of a fraction of the oxide phase that was not reduced. Mössbauer spectroscopy confirms the presence of the BCC structure of the FeCo magnetic bond in FeCo, FeCo-400 and FeCo-700 materials and indicates values of isomeric displacement and Bhf coefficient with literature for the FeCo phase. The H2-TPR profile shows a complete reduction of the oxide in …
abstract: This research proposed to develop a FeCo magnetic alloy encapsulated in carbon, using ethanol as a carbon precursor, through the CVD route, for the photocatalytic degradation of organic contaminants. Initially, a CoxFeyO4 oxide in a 1:1 ratio was synthesized using the Pechini method. The material was subjected to in situ reduction, by the CVD method, using ethanol as the initial reagent at temperatures of 400, 500, 600 and 700ºC. The reactions were studied by Gas Chromatography (GC), from gas aliquots collected at predetermined times. From the ethanol dehydrogenation and dehydration reactions, it is transformed into an encapsulated binder and, for comparative purposes, it is reduced to oxide in the pure FeCo binder using only H2. You are materialized by a characterized and interpreted result. From the analysis of XRD and Rietveld Refinement, it is possible to identify the phases present without CoxFeyO4 oxide, as well as the presence of crystalline carbon and FeCo phases in reduced materials via CVD, whose peak intensity increases with the synthesis temperature. Thus, we show FeCo-400 and FeCo-700 were treated in acidic and alkaline medium and we verified the importance of encapsulation for the stability of the FeCo bond. TGA profiles indicate an increase in the thermal stability of the bond as the local temperature is raised. Magnetic measurements performed for the FeCo, FeCo-400 and FeCo-700 samples reveal a reduction in the more values due to the presence of the carbon phase, as well as showing high Hc values compared to the FeCo Bond, especially for an It presents FeCo-400, which may be associated with the existence of a fraction of the oxide phase that was not reduced. Mössbauer spectroscopy confirms the presence of the BCC structure of the FeCo magnetic bond in FeCo, FeCo-400 and FeCo-700 materials and indicates values of isomeric displacement and Bhf coefficient with literature for the FeCo phase. The H2-TPR profile shows a complete reduction of the oxide in …
author: Lopes, Antônio Marcelo Silva
language: pt_BR
keywords: Liga FeCo, Encapsulamento em carbono, Nanotubos de carbono, Aplicações fotocatalíticas, Separação magnética
date published: 2021-10-26
date modified: 2026-07-24T01:20:51Z
provider: Brazil UFRN
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Universidade Federal do Rio Grande do Norte