Banca de DEFESA: TALITA MARIA SILVA DE SOUSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : TALITA MARIA SILVA DE SOUSA
DATA : 20/12/2019
HORA: 09:00
LOCAL: IQ UFBA
TÍTULO:

SYNTHESIS STUDY OF PEROVSKITA LaNiO3 TYPE CATALYTIC PRECURSORS SUPPORTED IN SiO2 APPLIED IN DRY REFORMING OF METHANE 

PALAVRAS-CHAVES:

Dry methane reforming, Perovskites supported. Silica.

PÁGINAS: 103
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Físico Química Inorgânica
RESUMO:

Unsupported and SiO2 supported Perovskite catalytic precursors were prepared by the citrate method, wet impregnation and as a proposal of this work, single step synthesis with addition of the support in the citrate route. Subsequently, they were characterized by TG, FTIR, XRD, BET, BJH, SEM, MET, TPR-H2 and evaluated in dry reform of methane. XRD results indicated that the citrate route was satisfactory to obtain the desired perovskite phase and the diffractograms of the reduced samples showed the Ni/La2O3 catalyst formation, and for the supported Ni/La2O3/SiO2 samples. It was verified by the average size of the crystallite that the support promoted the reduction of the metallic phase. Scanning and transmission electron microscopy and surface area and porosity results indicated that the difference in synthesis between the supported materials generated different distributions of the precursors in the support as well as different particle sizes. The results of TPR –H2 showed the significant effect of the synthesis method and the presence of the support under Ni reduction. All catalysts studied were active for methane dry reforming with reaction temperatures below the homogeneous phase. The effect of the support on reducing the activation energy of the reagents, with reaction temperatures lower than the unsupported sample, was also highlighted. The singlestage synthesized sample showed the best results for reagent conversion and product yields, in addition to the near-stoichiometric H2/CO ratio. In addition, the TPO results also indicated the efficiency of this catalyst, due to the 50 times lower carbon formation compared to the reference sample, suggesting that the synthesis method proposed by this work made it possible to obtain a material with high homogeneity and with particle size and surface area, suitable for catalytic activity.

MEMBROS DA BANCA:
Presidente - 1100392 - SORAIA TEIXEIRA BRANDAO
Interno - 2494172 - LILIAN MARIA TOSTA SIMPLICIO RODRIGUES
Externo à Instituição - ROBERT NEWTON DA SILVA HENRIQUES MAGALHÃES - IFBA
Externo à Instituição - LUCIENE SANTOS CARVALHO - IFBA
Externo à Instituição - ANDRE ROSA MARTINS - IFBA