Banca de QUALIFICAÇÃO: DHARA BEATRIZ DE AMORIM PRYSTON

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : DHARA BEATRIZ DE AMORIM PRYSTON
DATE: 29/08/2024
TIME: 09:00
LOCAL: PLATAFORMA RNP
TITLE:

SYNTHESIS AND CHARACTERIZATION OF MIXED OXIDES BASED ON CERIUM AND NIOBIUM FOR APPLICATION IN BIOMASS CONVERSION

KEY WORDS:

Biomass; synthesis methods; heterogeneous catalysts; and metal oxides.

PAGES: 90
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

The dependence on fossil fuels in the global energy matrix has triggered environmental and economic crises. To address these issues, the introduction of renewable and low-cost alternative resources, such as biomass, has emerged as a beneficial ally in mitigating climate change. Biomass, mainly composed of carbohydrates such as fructose, plays a crucial role in the production of industrially important chemicals, such as 5hydroxymethylfurfural. In this scenario, the advancement of selective and efficient catalytic systems for this purpose has been extensively researched, with a particular focus on heterogeneous catalysts, due to their multiple advantages, such as recovery and reuse. Therefore, in this study, several Ce and/or Nbbased oxides were synthesized by varying the theoretical niobium load by 5, 15 and 25%, using two synthesis methodologies: the glycerol-modified Pechini method and the metal-chitosan complexation method. The subsequent idea involves the exploitation of these materials in the conversion of biomass. Thus, in order to elucidate the structural, textural and electronic properties, the catalysts were widely characterized by the mid-infrared absorption spectroscopy (FTIR) technique, nitrogen physisorption analysis (by the BET and BJH methods), thermogravimetric analysis (TG/DTG), X-ray diffraction (XRD), Ultraviolet-Visible Diffuse Reflectance Spectroscopy (DRS), Raman spectroscopy and scanning electron microscopy (SEM).

COMMITTEE MEMBERS:
Externo(a) ao Programa - 1545506 - ANTONIO OSIMAR SOUSA DA SILVA - nullInterno(a) - 1869296 - CINTYA D'ANGELES DO ESPIRITO SANTO BARBOSA
Externo(a) à Instituição - PAULO ANSELMO ZIANI SUAREZ
Presidente - 1515173 - SIMONI MARGARETI PLENTZ MENEGHETTI
Externo(a) à Instituição - THATIANE VERISSIMO DOS SANTOS MARTINS
Interno(a) - 1697766 - WANDER GUSTAVO BOTERO