Banca de QUALIFICAÇÃO: JOÃO MANUEL RÊGO SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOÃO MANUEL RÊGO SILVA
DATE: 15/06/2022
TIME: 13:00
LOCAL: Auditório do Nupprar
TITLE:

EVALUATION OF THE KINETICS AND THERMODYNAMICS OF THE THERMOCATALYTIC DEGRADATION OF SUNFLOWER OIL USING ZEOLITE H-ZSM-5 AND Al‑MCM‑41.


KEY WORDS:

cracking; sunflower oil; kinetic, H-ZSM-5; Al-MCM-41.



PAGES: 98
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:
The sunflower oil pyrolysis process was evaluated by thermogravimetry coupled to a Fourier transform infrared spectrophotometer (TGA-FTIR), in the presence of microporous (H-ZSM-5) and mesoporous (Al-MCM-41) catalysts in different proportions, to qualitatively evaluate the effect of deoxygenation of pure oil in obtaining renewable hydrocarbons. The catalysts were characterized by techniques and were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and determination of surface acidity. Through these techniques, the catalysts present characteristics consistent with the literature, where they show good structural organization. The reaction kinetics was evaluated using isoconversional methods (FWO, KAS and Vyazovkin - Vy) at three heating rates (5, 10 and 20 ºC min-1) in the conversion range between 20% and 80%. The methods present a level of confidence, as they numerically present relatively close Ea values. The apparent activation energies for 50% conversion of sunflower oil in the absence of catalysts using the FWO, KAS and Vy methods were 262.56, 255.35 and 234.85 kJ mol-1, respectively; on the other hand, the OGMH2 mixture (in the presence of catalytic material) showed Ea values corresponding to 152.23, 143.18 and 142.72 kJ mol-1 for the same 50% conversion, respectively. The thermodynamic parameters, viz. enthalpy (ΔH), Gibbs free energy (ΔG) and entropy (ΔS), were calculated with the values of apparent activation energy from the kinetic methods studied. The Vy method presents better acceptance for the Ea values found, as it uses theapproximation of Senum and Yang (1977) for the temperature integral, producing insignificant errors.


BANKING MEMBERS:
Presidente - 350509 - ANTONIO SOUZA DE ARAUJO
Interna - 2140818 - AMANDA DUARTE GONDIM
Externa à Instituição - ARUZZA MABEL DE MORAIS ARAUJO - UFRN
Externo à Instituição - JOAO PAULO DA COSTA EVANGELISTA - UnP
Notícia cadastrada em: 06/06/2022 11:11
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