Banca de DEFESA: MAILENA SILVA DOURADO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : MAILENA SILVA DOURADO
DATE: 15/02/2022
TIME: 08:00
LOCAL: videoconferência na plataforma RNP (sala PEI-UFBA)
TITLE:

Obtaining biofuel similar to petroleum diesel by catalytic pyrolysis of microalgae biomass .

KEY WORDS:

Fast pyrolysis; Catalysis, Microalgae, Green Hydrocarbons.

PAGES: 148
BIG AREA: Engenharias
AREA: Engenharia de Produção
SUMMARY:

Currently, microalgae have been widely studied as a source of biomass to produce biofuels due to their high productivity, high lipid content and ability to grow in a wide variety of climates and spaces without competing with food production. The objective of this work is the production of green hydrocarbons similar to the constituents of conventional diesel, from the rapid thermal pyrolysis of the lipid fraction of microalgae of the Halamphora coffeaeformis (Hc), Chlorella vulgaris (Cv) and Nannochloropsis oculata (No) genera. For the latter, the feasibility of its use when subjected to rapid catalytic pyrolysis was studied. This practice emphasizes the important role of catalysis in fast pyrolysis. The catalysts used showed synergy to thermal cracking, amplifying the products of interest. Studies were also carried out using a model molecule, myristic acid, representing the fatty acids that can be found in microalgae. It was verified that the products generated in the micropyrolysis of this molecule in the presence of niobia catalysts (Nb350, Nb700, NbB700,) at two temperature levels, 500 and 600°C, showed formation of ketones and hydrocarbons by fatty acid deoxygenation. Furthermore, experiments using C14 with alumina catalysts ( γ-Al2O3) and niobium supported on alumina (Al700 and AlNb700) were used only at a temperature of 600ºC. The experiments were carried out in a Multi-shot Pyrolyzer Model EGA/PY-3030D micropyrolyser, from Frontier Laboratories LTD, connected online with a gas chromatograph coupled to an Agilent GC-MS 5799A mass spectrometer. All micropyrolysis were performed by the “Single-Shot” (SS) thermal method. Niobium-based catalysts were prepared from hydrated niobium oxide by calcination at 350 and 700°C, the latter sample being modified with boric acid (Nb350, Nb700 and NbB700). From the purely thermal pyrolysis of the lipid fraction of the microlags, conducted at a temperature of 600°C, the best response was verified and then tests with the catalysts (Nb350, Nb700 and NbB700) could be carried out. The products of myristic acid micropyrolysis were identified through the NIST Database, assuming a probability of agreement of parameters equal to or greater than 80%. For the pyrolysis of the lipid fraction of microalgae, 70% agreement was admitted. The main results obtained with the model molecule showed that Nb350 is as efficient as Al700 in pyrolysis at 600°C, producing ketones that can be considered intermediate in the production of olefin and alkane hydrocarbons, and with a larger carbon chain. than the starting acid. In the pyrolysis of the lipid fraction of No, the catalysts Nb350, Nb700 and NbB700 had an important performance, increasing from 18% to 35% the production of hydrocarbons compatible with diesel fuel.

BANKING MEMBERS:
Externo à Instituição - ROGER THOMAS FRANCOIS FRETY
Externa à Instituição - Renata Maria Rosas Garcia Almeida
Externo à Instituição - Donato Alexandre Gomes Aranda
Externa à Instituição - ALICE COSTA KIPERSTOK
Externo à Instituição - ARTUR JOSE SANTOS MASCARENHAS
Presidente - 136.564.225-91 - EMERSON ANDRADE SALES - UFBA