Banca de DEFESA: NAYONARA KAROLYNNE COSTA DE ARAÚJO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : NAYONARA KAROLYNNE COSTA DE ARAÚJO
DATE: 12/09/2022
TIME: 09:30
LOCAL: AUDITÓRIO NUPPRAR
TITLE:

THERMAL BEHAVIOR AND KINETIC STUDY FOR THE CO-PROCESSING OF SOYBEAN OIL/DIESEL USING BENTONITE CLAY CATALYSTS

KEY WORDS:

Biofuels, soybean oil, thermal study, kinetic study, diesel, copyrolysis

PAGES: 100
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

The ambitious search for fossil fuels has caused serious environmental concerns, attracting more and more attention from the industry and the scientific community to the research and development of sustainable and ecological alternative fuels. Therefore, to mitigate environmental concerns and meet the growing demand for energy, vegetable oils, especially soybean oil, have attracted great attention from researchers for developing an environmentally friendly and high-quality fuel through pyrolysis. Based on this reflection, the present thesis aims at the production of renewable hydrocarbons from the copyrolysis of soybean oil/diesel using bentonite (acidic, pillared and impregnated with nickel) as a catalyst. The bentonite clay-based catalysts were characterized by XRD, BET and FTIR and presented results according to the literature. The thermal and thermocatalytic study showed three characteristic events of soybean oil biomass degradation, (1) stage: humidity evaporation (20 - 150°C), (2) stage: decomposition zone or active pyrolytic zone and (3) step: above 500°C is the final carbonization step. Finally, the kinetic study was carried out from the thermogravimetric data, it was possible to calculate the activation energy (Ea) for each conversion using the isoconversional methods of Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) that showed R2 values above 0.9, demonstrating a satisfactory adaptation of the models to the process. Soybean oil biomass with nickel-impregnated acid bentonite clay obtained the best result, that is, the presence of the catalyst reduced the activation energy of the soybean oil from 385.61 and 356.04 kJ/mol for the KAS and FWO method. respectively, to 99.88 kJ/mol for the FWO method and 138.77 kJ/mol for the KAS method, which can be considered as a promising raw material for the pyrolysis process. Then, the thermal and kinetic study of the co-processing of the soybean oil/diesel mixture was carried out.

COMMITTEE MEMBERS:
Presidente - 2140818 - AMANDA DUARTE GONDIM
Interno - 348475 - DJALMA RIBEIRO DA SILVA
Externa à Instituição - ARUZZA MABEL DE MORAIS ARAUJO - UFRN
Externa à Instituição - FABÍOLA CORREIA DE CARVALHO - CTGás
Externa à Instituição - VIVIANE DE OLIVEIRA CAMPOS - UFRN