Banca de DEFESA: MARIELE IARA SOARES DE MELLO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : MARIELE IARA SOARES DE MELLO
DATA : 10/03/2017
HORA: 09:00
LOCAL: Auditório do CCET
TÍTULO:

STUDY OF CATALYSTS FOR THE PRODUCTION OF FUELS: FISCHER-TROPSCH AND CO₂ HYDROGENATION

PALAVRAS-CHAVES:

Fischer-Tropsch, character-based acid, methanol, CO2

PÁGINAS: 150
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Cinética Química e Catálise
RESUMO:

Studies of catalysts used in reactions for the production of energy fuels, such as Fischer-Tropsch Synthesis (FTS) and Methanol Synthesis from CO2 or CO2 Hydrogenation of Methanol were done. The effect of the chemical nature of the oxide support on the performance of cobalt Fischer−Tropsch catalysts is investigated. A series of supports is synthesized via monolayer coverage of porous γ-Al2O3 with various oxides representative of a wide range of Lewis acid−base character, as quantified by UV−vis spectroscopy coupled to alizarin adsorption. It was possible to develop models catalysts with particle size of Co and the like porosity, allowing the study of the effect of the support, without overlapping diffusion factors or particle size. Selectivity C13+ hydrocarbon showed dependence on volcano type, with a maximum with a character intermediate acid-base. As inferred from in situ CO-FTIR, “selective” blockage of a few cobalt sites, though crucial for CO hydrogenation, by atoms from basic oxides and “unselective” site blockage via decoration of Co nanoparticles (strong metal−support interaction) with acidic, reducible oxides cause a decrease in reaction rate for supports with pronounced alkaline and acidic character, respectively. For TiOx/Al2O3 remarkable C13+ productivity was achieved due to good activity and selectivity. The influence of zirconium and the method of synthesis of the catalysts in the catalytic system Cu/Zn/Zr supported on mesoporous silica SBA-15 was studied, in the reaction of hydrogenation of CO2 to methanol. It is concluded that the chosen methods allowed the incorporation of the metals and these provided different characteristics to the catalysts. In general, it is observed that the greater the conversion of CO2 the lower the selectivity to methanol.

MEMBROS DA BANCA:
Externo ao Programa - 2302898 - ELEDIR VITOR SOBRINHO
Externo à Instituição - LUIZ ANTÔNIO MAGALHÃES PONTES - UFBA
Presidente - 1308577 - SIBELE BERENICE CASTELLA PERGHER
Interno - 2087667 - TIAGO PINHEIRO BRAGA
Externo à Instituição - VICTOR LUIS DOS SANTOS TEIXEIRA DA SILVA - UFRJ