Banca de QUALIFICAÇÃO: ISABELLE MARIANE DE LIMA FERREIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : ISABELLE MARIANE DE LIMA FERREIRA
DATE: 26/06/2023
TIME: 09:00
LOCAL: Auditório do NUPPRAR
TITLE:

Production of renewable hydrocarbons from the microalgae Monoraphidium sp.

KEY WORDS:

Microalgae; renewable hydrocarbons; pyrolysis

PAGES: 145
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Cinética Química e Catálise
SUMMARY:

The energy potential of the microalgae of the species Monoraphidium sp. was exploited as a raw material for the production of renewable hydrocarbons. For this, the biomass was submitted to physical-chemical pre-treatments with the objective of facilitating the intracellular access of the microalgae. Renewable hydrocarbons from treated biomass were obtained through thermal and catalytic pyrolysis processes in the presence of the HZSM-5 catalyst. The HZSM-5 zeolite was synthesized and characterized by X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA/DTG), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Determination of acidity by base adsorption method (n-butylamine). XRD analyzes confirmed the formation of an MFI-like crystalline structure, with patterns similar to those defined by the International Zeolite Association (IZA). The acidity analysis showed the presence of acidic sites in the zeolite necessary for catalytic pyrolysis reactions. The kinetic parameters involved in the pyrolysis reactions of microalgae biomass were estimated through the development of the Ozawa-Flynn-Wall (OFW) and Kissinger-Akahira-Sunose (KAS) models, with the aid of thermogravimetric analysis (TGA/DTG) in the ratios of heating 10, 20, 30 and 40 °C/min. In which, it was evident that the two models generated accurate kinetic data that reflect the thermal conversion of the biomass. The pyrolysis led to the formation of the liquid product, bio-oil that was characterized by Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography Coupled with a Mass Spectrometry Detector (GC-MS). The chemical composition by GC-MS showed that the bio-oils produced can be precursors of biofuels, as they contain hydrocarbons in the C6-C20 range, which include gasoline, diesel and aviation kerosene.

COMMITTEE MEMBERS:
Presidente - 2140818 - AMANDA DUARTE GONDIM
Interno - 2087667 - TIAGO PINHEIRO BRAGA
Externa ao Programa - 2140775 - LIVIA NUNES CAVALCANTI - UFRNExterno à Instituição - RAONI BATISTA DOS ANJOS - UFRN