Banca de QUALIFICAÇÃO: THIAGO WINICIO ROCHA LIMA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : THIAGO WINICIO ROCHA LIMA
DATE: 05/11/2024
TIME: 08:00
LOCAL: PGTEC
TITLE:

Production and characterization of blind-bottom helical tubular ceramic membranes made of Ce2(WO4)3 (cerium tungstate) using the modified phase inversion casting method in a 3D printed mold

KEY WORDS:

dead-end helical tubular membrane, cerium tungstate, phase inversion, 3D printed mold

PAGES: 35
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Operações Industriais e Equipamentos para Engenharia Química
SPECIALTY: Operações de Separação e Mistura
SUMMARY:

Climate change, caused by greenhouse gas (GHG) emissions, is already affecting several regions of the planet, manifesting itself in extreme weather events. Methane gas (CH4) stands out due to its high short-term warming potential, which requires research and investment in removal technologies directly at the emission sources. There are studies on the development of catalytic ceramic membrane reactors (e.g. perovskites, tungstates) for converting methane into products such as synthesis gas (CO+H2), an input in other production and energy chains. Although there are advances, further research is needed to develop membranes with innovative conformations, since membrane geometry plays a crucial role in the efficiency of processes involving gas separation. This work proposes the production and characterization of a dense, tubular helical ceramic membrane made of cerium tungstate (Ce₂(WO₄)₃) for its application in the partial oxidation of methane for synthesis gas production. Ce₂(WO₄)₃ will be synthesized using the sol-gel EDTA-Citrate combined complexation method. The tungsten precursor (WO3) will be obtained from the acid leaching of scheelite concentrate from the Brejui Mine, Rio Grande do Norte. The manufacturing process will involve phase inversion casting, in which the polymers polysulfone (PSU), polyethersulfone (PES), and polyphenylsulfone (PPSU) will be tested in a mold that will be designed for 3D printing. The WO3 precursor and the synthesized Ce₂(WO₄)₃ ceramic powder will be characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM) techniques. The helical membrane tubes will be subjected to the bending test to measure mechanical strength, the BET technique to determine the specific surface area, and the FEG SEM with coupled EDS. The manufactured membrane, with the best-performing polymer during casting, is expected to present the desired geometry, density with selective oxygen permeability and good mechanical resistance, being a promising alternative for reducing greenhouse gas emissions and generating clean energy.

COMMITTEE MEMBERS:
Presidente - 349801 - CARLSON PEREIRA DE SOUZA
Interna - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Interno - 1149554 - OSVALDO CHIAVONE FILHO
Externo ao Programa - 1474380 - MARCIO ASSOLIN CORREA - UFRN