Banca de QUALIFICAÇÃO: THAMIRIS MONTEIRO DE BARROS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : THAMIRIS MONTEIRO DE BARROS
DATE: 06/02/2025
TIME: 14:00
LOCAL: Auditório do NUPPRAR
TITLE:

Potential production of drop-in biofuels using biomass derived from tropical almond (Terminalia catappa Linn) through thermocatalytic conversion.

KEY WORDS:

Terminalia catappa Linn; tropical almond; vegetable oil; biofuels; catalysis; pyrolysis

PAGES: 95
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Cinética Química e Catálise
SUMMARY:

The tropical almond, known locally as “castanhola”, the fruit of the “amendoeira-da-praia” (Terminalia catappa Linn), are little explored for consumption and commercialization, occur in a large part of the country, mainly in coastal regions, and have almonds rich in lipids with a profile of palmitic (C16:0) and oleic (C18:1) fatty acids, mainly, characterizing themselves as a potential raw material for the production of biofuels in the range of diesel and aviation kerosene, as drop-in biofuels, have a hydrocarbon composition compatible with fossil fuels, facilitating their implementation in them and in their technologies, infrastructure and logistics from production to use in current engines. Thus, this work studied the thermochemical conversion of castanhola nut oil (OSC) to bio-oil, aiming at the production of drop-in biofuels using 30% by mass of niobium phosphate (NbOPO4), ɣ-alumina (ɣ-Al2O3) and/or niobium impregnated with ɣ-alumina (20Nb/ɣ-Al2O3) as catalysts. The OSC was extracted in cycles of up to 8 hours through solvent extraction (n-hexane in Sohxlet) and characterized by fatty acid profile by gas chromatography coupled to mass spectrometry (GC-MS), thermogravimetric analysis (TGA/DTG) and physicochemical properties such as free fatty acid (FFA) content, acidity, moisture, density and kinematic viscosity at 40 °C. To determine the reaction, kinetic and thermodynamic parameters, such as activation energy and pre-exponential factor, TGA/DTG was used between 30-600 °C, at different heating rates (10, 20, 30 and 40 °C/min), following the isoconversional Kissinger-Akahira-Sunose (KAS) and Ozawa-Flynn-Wall (OFW) methods. Thermal and thermocatalytic pyrolysis of OSC were performed at temperatures between (350-525 °C), heating rates between 5-60 °C/min and residence time between 5-10 minutes. The kinetic study of OSC provided average activation energy of 154.9 kJ/mol (OFW) and 174.7 kJ/mol (KAS), decreased with the use of catalysts, mainly with the use of NbOPO4 to 109.6 kJ/mol and 125.7 kJ/mol (OFW and KAS, respectively), showing greater catalytic activity for OSC conversion. Through the thermodynamic study, the pyrolysis reaction of OSC was shown to be endothermic, irreversible and non-spontaneous. In addition, through thermal pyrolysis, a maximum yield of approximately 80% of bio-oil with chain composition between C10-C38 was obtained, with the optimum condition established from the hydrocarbon content of 14.36% to 65% of bio-oil. The bio-oil yields for thermocatalytic pyrolysis did not undergo significant changes, being between 63-72%, being maximum with the application of 20Nb/ɣ-Al2O3 (71.6%) and minimum with calcined NbOPO4 (63.2%). Therefore, the potential of OSC as biomass for the production of C15 and C17 hydrocarbons through the pyrolysis process was demonstrated, as well as the catalytic activity of the catalysts used.

COMMITTEE MEMBERS:
Presidente - 2140818 - AMANDA DUARTE GONDIM
Externa à Instituição - ARUZZA MABEL DE MORAIS ARAUJO - UFRN
Externa à Instituição - EDJANE FABIULA BURITI DA SILVA - UFRN