Banca de QUALIFICAÇÃO: MILTON DE SOUSA FALCÃO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE: MILTON DE SOUSA FALCÃO
DATA: 19/02/2024
HORA: 14:00
LOCAL: Auditório do Programa de Pós-Graduação em Química/UFPI
TÍTULO: PdAg/CoFe2O4 Bimetallic Catalyst with High Selectivity for Glyceraldehyde in Glycerol Selective Oxidation Reaction.
PALAVRAS-CHAVES: Glycerol; Selective oxidation; Glyceraldehyde; Bimetallic Ag-Pd; magnetic support
PÁGINAS: 30
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
RESUMO:

This work reports the catalytic oxidation of glycerol with Palladium-Silver bimetallic nanoparticles (Pd-Ag) immobilized on cobalt ferrite (CoFe₂O₄). Bimetallic nanoparticles were prepared by the galvanic replacement method, immobilized on CoFe₂O₄ by wet impregnation and characterized by VSM, UV-Vis, TGA/DTA, XRF, TEM, SEM and DRX techniques. Bimetallic Pd-Ag nanoparticles with 39 wt% Pd content effectively catalyzed the selective oxidation reaction of glycerol to glyceraldehyde. Catalytic oxidation was carried out at 60 - 80 °C for 2 - 4 h in an aqueous NaOH solution (NaOH/glycerol ratio = 4 mol/mol) under O₂ pressure of 4 bar; the selectivity of glyceraldehyde reached 99.35% and the conversion of glycerol of 49.07% at a temperature of 60 °C and a reaction time of 2 h. Samples were analyzed by high-performance chromatography (HPLC). Glyceric acid and traces of tartronic acid and mesoxalic acid were also detected. The catalyst was also very stable, showing activity up to 4 runs without significant loss of activity and selectivity.

MEMBROS DA BANCA:
Presidente - 2363808 - EDMILSON MIRANDA DE MOURA
Interno - 1508806 - WELTER CANTANHEDE DA SILVA
Interno - 2406262 - ROBERTO ALVES DE SOUSA LUZ
Externo à Instituição - JOSÉ LUIZ SILVA SÁ - UESPI