Banca de DEFESA: ANA CAROLINE NEVES DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANA CAROLINE NEVES DA SILVA
DATA : 28/06/2019
HORA: 14:00
LOCAL: Instituto de Química
TÍTULO:

Study of the catalytic properties of La1-xSrxCoO3 perovskites applied to the catalytic combustion of methane

PALAVRAS-CHAVES:

combustion, perovskite, methane, oxygen mobility

PÁGINAS: 120
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Cinética Química e Catálise
RESUMO:

The perovskite-type La1-xSrxCoO3 (x = 0.0, 0.2, 0.4) catalysts and cobalt oxide were synthesized by the citrate method. The samples obtained were characterized and evaluated against the catalytic combustion reaction of methane. The effect of the partial substitution of the lanthanum at the A site of the perovskite by strontium was investigated, as well as to observe the catalytic effect of cobalt in different chemical environments, relating this parameter to the catalytic properties of the studied oxides. The techniques performed in this work were X-ray diffraction (XRD), BET method, Reduction Programmed Temperature (TPR-H2) and Spectroscopy in the UV-Visible region with Diffuse Reflectance (Uv-vis DRS). All samples were submitted to the Thermoprogrammed Surface Reaction (TPSR) and had Activation Energy calculated in order to measure their activity against the combustion reaction. The results indicate that the catalytic activity of the species is mainly determined by the presence of the Co3 + ion and the mobility of oxygen on the surface of the catalysts. The presence of strontium also showed positive aspects in the catalytic properties.

MEMBROS DA BANCA:
Interno - 2494172 - LILIAN MARIA TOSTA SIMPLICIO RODRIGUES
Interno - 2362069 - RAILDO ALVES FIUZA JUNIOR
Externo ao Programa - 1900073 - ROGER THOMAS FRANCOIS FRETY
Externo à Instituição - MARLUCE OLIVEIRA DA GUARDA SOUZA - UNEB