Banca de DEFESA: DHARA BEATRIZ DE AMORIM PRYSTON

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DHARA BEATRIZ DE AMORIM PRYSTON
DATE: 25/03/2022
TIME: 09:00
LOCAL: https://conferenciaweb.rnp.br/events/defesa-mestrado-dhara-ppgqb
TITLE:

SYNTHESIS AND CHARACTERIZATION OF CeO2, MoO3 AND CeO2-MoO3, VIA THE PECHINI METHOD USING
GLYCEROL AS POLYALCOHOL, AND ITS APPLICATION IN THE CONVERSION OF FRUCTOSE

KEY WORDS:

biomass, fructose, catalysis, Cerium, Molybdenum

PAGES: 20
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

The use of fossil sources (example: oil, coal and natural gas) as the main raw material for the chemical
industry has led the world to face environmental challenges and crisis in the energy sector. To deal with
these issues, the introduction of alternative resources that are renewable and of low cost in the energy
matrix, such as biomass, appears as a benign ally to contain climate change. Biomass is mainly composed of
carbohydrates, such as fructose, which are molecules considered to be important building blocks for
obtaining chemical products with high added value. The use of low cost, efficient and reusable catalysts
plays a fundamental economic and environmental role in biomass conversion reactions. Among them, metal
oxides stand out due to the diversity of acid sites, stability in aqueous media and cost-effectiveness. Thus, in
this work, cerium oxides (Ce100) and molybdenum (Mo100) were synthesized, as well as a mixed oxide of
cerium with 25% molybdenum (CeMo25), through the Pechini method using glycerol as polyol, for further
exploration in the fructose conversion reaction to chemical inputs of high industrial interest. In order to
elucidate the structural and textural properties, the catalysts were characterized by the technique of
absorption spectroscopy in the infrared region (FTIR), nitrogen physisorption analysis (BET and BJH),
thermogravimetric analysis (TG/DTG), Diffraction of X-rays (XRD) and infrared absorption spectroscopy
using pyridine as a probe molecule (FTIR-pyridine). Then, the reaction tests were carried out at the
optimized temperature of 150 °C from 0.5 to 6 hours. The catalysts showed excellent results in terms of
converted fructose, 97,6% for CeMo25, 97,85% for Mo100 and 51,01% for Ce100.

BANKING MEMBERS:
Interna - 1869296 - CINTYA D'ANGELES DO ESPIRITO SANTO BARBOSA
Externo ao Programa - 1797785 - LUCAS MEILI
Presidente - 1515173 - SIMONI MARGARETI PLENTZ MENEGHETTI