Banca de QUALIFICAÇÃO: FELIPE FERNANDES BARBOSA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : FELIPE FERNANDES BARBOSA
DATA : 10/05/2018
HORA: 14:00
LOCAL: Auditório do NUPPRAR
TÍTULO:

Dehydrogenation of ethylbenzene in styrene: An interesting alternative for the production of carbon nanotubes and coupled FeCo alloys

PALAVRAS-CHAVES:

dehydrogenation, ethylbenzene, carbon filaments, FeCo alloy.

PÁGINAS: 75
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
RESUMO:

The catalytic dehydrogenation reaction of ethylbenzene was used to study the nature of deposited carbon and to verify the formation of structures organized in the form of carbon nanotubes (CNT) coupled to FeCo magnetic alloys via chemical vapor deposition (CVD) as well as, in parallel, lead to the formation of high added value products, such as styrene (ST). A 1:1 Fe and Co based oxide synthesized by the polymer precursor method was used as the catalyst for this reaction. The reducing environment from the dehydrogenation was used to synthesize the FeCo alloy from the metal oxide. The reaction was carried out at four different temperatures (700, 650, 600 and 550°C) at 2h and 4h times. To characterize these materials, X-ray diffraction (XRD), programmed temperature reduction (TPR), thermogravimetric analysis (TGA), scanning electron microscopy (FEG-MEV), dispersive energy, Vibrating Sample Magnitude (VSM) and gas phase (GC) chromatography. The diffractograms indicate the formation of the FeCo alloy and the presence of crystalline carbon. The H2-TPR profiles confirm that the alloy can be formed at the reaction temperature from 370°C. The images obtained by FEG-MEV coupled to the EDS showed the formation of carbon filaments coupled to the FeCo alloy. Chromatograms indicate that the filaments were formed from the methane and/or ethene generated indirectly to dehydrogenation, as these products were not identified. The magnetic properties were confirmed by the VSM, which varies according to the reaction time and temperature and the saturation magnetization showed a direct relation with the size of the crystallite of the alloy.

MEMBROS DA BANCA:
Interno - 349770 - DULCE MARIA DE ARAUJO MELO
Externo ao Programa - 1674707 - MARCO ANTONIO MORALES TORRES
Presidente - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Externo ao Programa - 2087667 - TIAGO PINHEIRO BRAGA