Banca de QUALIFICAÇÃO: ELANIA MARIA FERNANDES SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ELANIA MARIA FERNANDES SILVA
DATA : 07/06/2017
HORA: 14:30
LOCAL: Auditório do NUPPRAR
TÍTULO:

Structured Oxides of Perovskite Type for Generation of Synthesis Gas from Dry Methane Reforming.

PALAVRAS-CHAVES:

synthesis; perovskites; methane dry reforming.

PÁGINAS: 60
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

High-performance catalysts have been widely researched in order to increase the yield in methane dry reforming processes (DRM). Some transition metals, especially nickel, are largely studied for this purpose. Due to its catalysts’ properties, thermal and chemical stability, perovskite-type oxides ABO3 are promising materials as catalytic precursors in DRM processes. In this work perovskite-type oxides ABO3 were synthesized by microwave assisted combustion using urea as fuel and calcinated at 900 ºC for 2h. After the calcination, all the prepared oxides were impregnated with 20% (w/w) of nickel and calcinated again at 600ºC for 2h. The samples were characterized by the following techniques: x-ray diffraction (XRD), temperature programmed reduction (TPR), and dispersive energy scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). Methane reforming tests with CO2 were performed in the oxides for evaluation of these materials as catalysts in the production of syngas. After the reforming tests, the catalysts were submitted once again to some characterizations for the evaluation of the existence of carbon in the oxides’ surface. According to the x-ray diffractogram, secondary phases of nickel oxides were formed after the nickel impregnation in the powders. The SEM images showed that the impregnation methodology resulted in a homogeneous dispersion of the nickel oxide particles on the perovskite’s surface.

MEMBROS DA BANCA:
Presidente - 349770 - DULCE MARIA DE ARAUJO MELO
Externo à Instituição - JOANA MARIA DE FARIAS BARROS - UFPB
Externo ao Programa - 1979301 - RENATA MARTINS BRAGA