Banca de DEFESA: WESLEY EULÁLIO CABRAL CAVALCANTI
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : WESLEY EULÁLIO CABRAL CAVALCANTI
DATE: 02/02/2023
TIME: 14:30
LOCAL: Auditório do CCET
TITLE:
GLYCEROL CONVERSION IN THE PRESENCE OF ETHANOL USING CATALYST BASED ON CoFe2O4/SBA-15
KEY WORDS:
Glycerol. SBA-15. Cobalt Ferrite. Conversion. Ethanol.
PAGES: 95
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Cinética Química e Catálise
SUMMARY:
Glycerol is the main byproduct for obtaining biodiesel, therefore, the growth of its production has caused an increase in the supply of glycerol, drastically reducing its market value. In order to improve the economic efficiency and ecological standards of biodiesel production, attempts have been made to catalytically convert glycerol into bioproducts with higher added value. In this sense, this work aimed to synthesize and characterize the solid based on cobalt ferrite supported on SBA-15 (CoFe2O4/SBA-15) to act as a catalyst in the reaction of conversion of glycerol in the presence of ethanol. The support was synthesized via hydrothermal method using P123 as organic director and TEOS as silica source. While the synthesis of the catalyst occurred through the impregnation of precursors of Fe3+ and Co2+ (Fe(NO3)3 · 9H2O and Co(NO3)2 · 6H2O) via Pechini's method. Characterizations via X-ray diffraction (DRX) and FTIR spectroscopy confirmed the syntheses of SBA-15 and CoFe2O4/SBA-15. Raman spectroscopy allowed the identification of ferrite with a degree of inversion (δ) of 0.4. The redox property of the catalyst was evaluated via the reduction at temperature program (TPR-H2) which showed reduction events above 400°C, referring to the reduction of Co2+ and Fe3+. The N2 physisorption analysis showed a surface area of 372 m2/g and a total pore volume of 0.65 cm3/g for the catalyst, indicating the presence of oxide on the surface and in the mesochannels of the support. Through scanning electron microscopy (SEM) it was confirmed that the support morphology was maintained after the impregnation process. Already from the transmission electron microscopy (TEM) it was observed an average particle size of 6.19 nm for the supported cobalt ferrite. The acid-base properties of the catalyst indicated the presence of weak basic sites via CO2 desorption at programmed temperature (TPD-CO2) and the presence of Lewis acid sites via NO and Pyridine adsorption followed by FTIR analysis. The presence and nature of the acid/base sites will be of fundamental importance for understanding the processes that occur during the glycerol conversion reaction in the presence of ethanol.
COMMITTEE MEMBERS:
Interna - 349770 - DULCE MARIA DE ARAUJO MELO
Externo à Instituição - RINALDO DOS SANTOS ARAÚJO - IFCE
Presidente - 2087667 - TIAGO PINHEIRO BRAGA