Banca de DEFESA: THAÍSA TRINDADE DE SOUZA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : THAÍSA TRINDADE DE SOUZA
DATE: 18/09/2025
TIME: 14:30
LOCAL: Auditório do NUPPRAR
TITLE:

Pyrolysis of Macaúba Pulp Oil (Acrocomia aculeata) using AlSBA-15 to obtain Bioenergy.

KEY WORDS:

Biofuel; Macauba pulp oil; Thermocatalytic pyrolysis; AlSBA-15

PAGES: 103
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Cinética Química e Catálise
SUMMARY:

The development of alternative fuels is important to reduce energy dependence on fossil fuels, as well as reduce greenhouse gas emissions and environmental impacts. Biofuel can be obtained in several ways, including pyrolysis and catalytic pyrolysis. Therefore, this study aims to perform catalytic pyrolysis of macaúba pulp oil in the presence of a mesoporous catalyst to obtain biofuel. The catalyst used must have active acidity sites for the deoxygenation reaction to occur; therefore, the impregnation of transition metals such as nickel into the catalyst support is necessary. Therefore, the catalyst impregnation with nickel (Ni) at percentages of 5% and 10% by mass on the AlSBA-15 support was studied. The catalysts were characterized by Souza (2019) with TG/DTG thermal analysis, X-ray diffraction (XRD), Fourier Transform Infrared Absorption Spectroscopy (FTIR), Nitrogen adsorption and desorption (BET) and scanning electron microscopy (SEM/EDS). The pyrolysis of macauba pulp oil was evaluated through thermogravimetric analysis. The data were kinetically analyzed using the Ozawa-Flynn-Wall (OFW) and Kissinger-Akahira-Sunose (KAS) models. The composition of the bio-oils produced was analyzed through GC/MS analysis of the products generated by pyrolysis in the absence and presence of catalysts. The OFW and KAS models are suitable for the macauba pulp oil conversion process, presenting a coefficient value above 0.9. The presence of the Ni/AlSBA-15 05% catalyst with 10% by mass causes a decrease in the activation energy, with a decrease of 2.3 KJ/mol in the first conversion and 11.5 KJ/mol in the second conversion in relation to the sample without catalyst. The ΔG, ΔH, and ΔS values indicate that the reactions are not spontaneous, depending on the heat introduced into the process during pyrolysis. In the pyrolysis processes, the Ni/AlSBA-15 05% nickel in oil and Ni/AlSBA-15 10% nickel in oil samples showed a 19.6% and 20.4% increase in the formation of hydrocarbon products, respectively, compared to pyrolysis without a catalyst. GC/MS analyses of the bio-oils show selectivity for the C17-C24 carbon range, with the presence of a catalyst enhancing this selectivity. The results for the catalytic pyrolysis samples are similar. This new route offers the advantages of renewable energy production, lower environmental impact, and the availability of raw materials in nature.

COMMITTEE MEMBERS:
Presidente - 2140818 - AMANDA DUARTE GONDIM
Interno - 350509 - ANTONIO SOUZA DE ARAUJO
Externa à Instituição - FABÍOLA CORREIA DE CARVALHO - CTGás
Externa ao Programa - 2140775 - LIVIA NUNES CAVALCANTI - nullExterno à Instituição - MÁRCIO CLEIVO DE MORAIS SOUZA - IFRN