Banca de QUALIFICAÇÃO: GABRIELLE MATHIAS REIS
Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.DISCENTE : GABRIELLE MATHIAS REIS
DATA : 01/04/2021
HORA: 14:00
LOCAL: https://meet.google.com/mjj-ubxz-kvi
TÍTULO:
Density of surface acid sites as parameter for evaluating the catalytic activity of sulfonated carbons in the fructose dehydration
PÁGINAS: 48
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Cinética Química e Catálise
RESUMO:
In this work sulfonated carbons were prepared and tested as catalysts in fructose to 5-HMF dehydration. The sulfonated carbons were prepared by the method of carbonization and sulfonation in situ in the presence of H2SO4, using glycerol and glucose as precursors. The characterization techniques used to elucidate the physical-chemical characteristics of the synthesized materials, confirmed the presence of favorable textural properties and acidic surface groups, mainly (but not exclusively) sulfonic and carboxylic groups, which are fundamental in the fructose dehydration reaction. The catalytic activity of the sulfonated carbons was evaluated, under microwave heating, obtaining 82.7% conversion at at 120ºC, using a 5wt % fructose solution in DMSO and 5wt % catalyst. Selectivity to 5-HMF reached values as high as 98%. The results allowed to evaluate the relative contribution of textural properties versus surface acidity of solids, elucidating some behaviors typically observed in this catalytic system.
MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1601156 - WAGNER ALVES CARVALHO
Membro Titular - Examinador(a) Interno ao Programa - 1766090 - MIRELA INES DE SAIRRE
Membro Titular - Examinador(a) Externo ao Programa - 028.198.966-42 - MARAISA GONCALVES - UNIFESP
Membro Suplente - Examinador(a) Interno ao Programa - 1762430 - DALMO MANDELLI