Banca de DEFESA: AMANDA SAYURE KASUYA DE OLIVEIRA
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.DISCENTE : AMANDA SAYURE KASUYA DE OLIVEIRA
DATA : 02/02/2018
HORA: 09:00
LOCAL: Sala 3F1
TÍTULO:
SYNTHESIS AND CHARACTERIZATION OF CATALYTIC SUPPORTS BASED ON ALUMINUM OXIDE AND / OR SILICON BY THE PROTEIN SOL-GEL METHOD
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 tetraethyl orthosilicate (TEOS) as inorganic precursors. The characterization was performed by thermogravimetric analysis (TG), X-ray fluorescence (XRF), X-ray diffraction (XRD), infrared spectroscopy (FTIR), scanning electron microscopy (SEM), N2 sorption, porosimetry of Mercury and catalytic tests (ethanol model dehydration reaction). The XRD diffractograms showed an amorphous material profile characteristic of highly dispersed metallic oxides. The TG results indicated the total release of the organic and inorganic material at the calcination temperature used, occurring at different mass loss intervals. This information was reaffirmed 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 following calcination that are related to metal oxides (SiO 2 and Al 2 O 3). The images acquired by SEM suggested obtaining a highly porous material with very different characteristics depending on the composition of the support. The sorption isotherms of N2 indicated the presence of a micro-mesoporous oxide with interesting texture properties, especially for the supports containing aluminum oxide and silicon oxide. The results of ethanol dehydration showed higher selectivity to diethyl ether compared to ethylene while acetaldehyde showed no results. From the reaction data, the following order of acid resistance was obtained: 2 Si: Al> Si: 2Al> Si: Al> Al, proving that the Si: Al ratio and surface area influence this sequence.
MEMBROS DA BANCA:
Presidente - 2087667 - TIAGO PINHEIRO BRAGA
Interno - 2140818 - AMANDA DUARTE GONDIM
Interno - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Externo à Instituição - JOSE MARCOS SASAKI - UFC