Banca de QUALIFICAÇÃO: AMANDA SAYURE KASUYA DE OLIVEIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : AMANDA SAYURE KASUYA DE OLIVEIRA
DATA : 06/09/2017
HORA: 10:00
LOCAL: Sala 3F1
TÍTULO:

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PALAVRAS-CHAVES:

Catalytic support; Protein sol-gel method; Gelatine; Aluminum Oxide; Silicon Oxide

PÁGINAS: 62
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Cinética Química e Catálise
RESUMO:

In order to synthesize nanostructured substrates from a simple, renewable, efficient, low cost and high catalytic performance methodology, substrates based on aluminum oxide and/or silicon oxide were synthesized using the protein sol-gel method using porcine gelatin as an organic precursor and aluminum nitrate and/or TEOS as inorganic precursors. The characterizations were performed through TG, XRD, FTIR, SEM, N₂ sorption and catalytic tests (model reaction). The XRD diffractograms showed an amorphous material profile characteristic of highly dispersed metallic oxides. The TG results indicate the total release of the organic and inorganic material at the calcination temperature used, occurring at different mass loss intervals. This information was confirmed by the FTIR spectra, which showed the presence of a hybrid material and gelatin structure bands before the calcination and disappeared in the solid spectrum after calcination, indicating the loss of organic matter after the heat treatment. The spectra exhibited M-O stretching vibration at low wavelengths after calcination that are related to metal oxides (SiO₂ and Al₂O₃). The images acquired by SEM suggest obtaining a highly porous material with very different characteristics depending on the composition of the carrier. N₂ sorption isotherms indicate the presence of a micro-mesoporous oxide with interesting textural properties, especially for the supports containing aluminum oxide and silicon oxide. The results of ethanol dehydration showed greater selectivity to diethyl ether compared to ethylene while acetaldehyde showed no results. From the reaction data the following order of acid resistance was obtained: 2Si:Al > Si:2Al > Si:Al > Al.

MEMBROS DA BANCA:
Externo ao Programa - 1979301 - RENATA MARTINS BRAGA
Interno - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Presidente - 2087667 - TIAGO PINHEIRO BRAGA