Banca de QUALIFICAÇÃO: MARITTA MEYRELLA DOS SANTOS LIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : MARITTA MEYRELLA DOS SANTOS LIRA
DATA : 13/12/2017
HORA: 09:00
LOCAL: AUDITÓRIO DO NUPEG
TÍTULO:

"SYNTHESIS OF MOLYBDENUM CARBIDE FROM MINERAL FROM RIO GRANDE DO NORTE."

PALAVRAS-CHAVES:

Nanostructured molybdenum carbide, gas-solid reaction, characterization, leaching.

PÁGINAS: 40
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

This work aims to propose a new alternative route of synthesis of nanostructured molybdenum carbide from the base mineral extracted from the city Carnaúba dos Dantas - RN, through gas - solid reactions at low temperature, as well as to provide a integrated theoretical view of the basic thermodynamic characteristics of the mineral, in order to facilitate the access to molybdenum carbide and increase the understanding with respect to the reactional behavior of this mineral. Initially, this starting ore will undergo a grinding process, followed by milling and sieving, and its characterization will be performed through X-ray fluorescence (XRF) and X-ray diffraction (XRD), to analyze if its characteristics are satisfactory for the synthesis. In the sequence, the ore treatment will be carried out through leaching and thermal treatments. Therefore, it will be done synthesis of the precursor, a more reactive reagent, used in the synthesis of the carbide by the gas-solid reaction. The precursor will be characterized by granulometric analysis (AG), X-ray fluorescence (XRF), X-ray diffraction (XRD), thermogravimetric, thermodifferential and calorimetric (TG / DTA / DSC) analysis, infrared (IR) spectroscopy, electron microscopy (SEM) and dispersive energy spectroscopy (EDS). The synthesis reaction will occur between the precursor and a gas mixture of H2 / CH4, where hydrogen is the reducing gas and methane is the carbon source. The synthesized nanostructured molybdenum carbide will be characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD) with refinement by Rietveld method, specific surface area analysis (BET), scanning electron microscopy (SEM) and spectroscopy of dispersive energy (EDS).

 

MEMBROS DA BANCA:
Presidente - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externo ao Programa - 350830 - JOSE HUMBERTO DE ARAUJO