Banca de QUALIFICAÇÃO: LUCAS FRANKLIN DE LIMA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LUCAS FRANKLIN DE LIMA
DATE: 21/03/2025
TIME: 11:00
LOCAL: PGTEC
TITLE:

SYNTHESIS OF NICKEL TUNGSTATE FROM SCHEELITE LEACHING PRECURSORS: APPLICATION IN PARTIAL OXIDATION OF METHANE

KEY WORDS:

Nickel tungstate; scheelite; leaching; syngas.

PAGES: 32
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
SPECIALTY: Processos Inorgânicos
SUMMARY:

In recent years, studies on methane conversion into higher value-added products have advanced, particularly in the production of hydrogen, syngas, and ceramic materials. The latter stand out for their thermal and catalytic properties, which are essential for applications in methane transformation. Scheelite (CaWO₄) is an important source of tungsten (W), with the Seridó region in Rio Grande do Norte having the highest concentration of this ore in Brazil. Tungsten is notable for its high hardness and high melting point (3419°C), being widely used in the form of tungsten carbide (WC), which is essential for metallurgy, construction, mining, and oil and gas drilling tools. Noble metals exhibit high catalytic activity in syngas production processes, such as partial methane oxidation (PMO). However, transition metals, particularly nickel, have demonstrated similar catalytic performance, making them a more economically viable alternative. This study proposes the synthesis of a nickel tungstate (NiWO₄) membrane using the EDTA-Citrate complexation method. The NiWO₄ precursor, in the form of tungsten oxide, will be obtained through the acid leaching of scheelite concentrate. After production, the tungstate will be characterized using thermogravimetry (TG-DTG), XRD, SEM-FEG, and XRF techniques. Subsequently, the nickel tungstate membranes will be tested in the partial methane oxidation process, and their catalytic performance in methane conversion into syngas will be evaluated.

COMMITTEE MEMBERS:
Presidente - 349801 - CARLSON PEREIRA DE SOUZA
Interno - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interna - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Externa ao Programa - 1218001 - LIANA FRANCO PADILHA - UFRN