Banca de QUALIFICAÇÃO: ANGELINNE COSTA ALEXANDRINO
Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.DISCENTE : ANGELINNE COSTA ALEXANDRINO
DATA : 17/08/2017
HORA: 14:30
LOCAL: AUDITÓRIO DO NUPEG
TÍTULO:
"Catalytic evaluation of coal derived from sewage sludge pyrolysis and molybdenum carbides materials for the production of biodiesel from methyl transesterification reaction of soybean oil at low pressure and temperature".
PALAVRAS-CHAVES:
soybean oil, transesterification, molybdenum carbides, sewage sludge carbon, biodiesel, kinetic model.
PÁGINAS: 131
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:
For decades, the production of environment-friendly fuels, as alternative power sources for oil, has gained attention and interest of researchers worldwide. Biodiesel is a renewable alternative fuel that can be obtained from residual oils, animal fat and vegetable oils through heterogeneous transesterification reaction using alcohol. In this context, heterogeneous catalyst present potential for biodiesel production as they can be regenerated and provide a cleaner and more efficient process. In this work, several molybdenum carbide catalysts were tested for the transesterification reaction of soybean oil with methanol towards producing biodiesel. These catalyst were pure Mo2C, Mo2C supported over activated carbon (A.C), pure A.C and bimetallic Ni (20%)-Mo2C/A.C being this support produced from sewage sludge pyrolysis. The pyrolysis product was treated with KOH, in order to increase its porosity and promote a larger specific surface area, and later physically activated. Gas solid reaction with CH4 and H2 atmosphere was used to produce the studied molybdenum derived catalysts, and ammonium molybdate was used as molybdenum source in all cases. All catalysts were characterized in a TG, XDR, XFR, SEM, B.E.T and laser particle size analysis basis. Their activity towards transesterification reaction was evaluated by using a mixing reactor with temperature control and alcohol reflux at 65 °C. The parameters that were manipulated for this experimental evaluation were: type and mass concentration of the catalyst (1, 2 and 5%), oil/alcohol ratio (1/6, 1/9, 1/12 and 1/18), pH (2.0; 4.0; 4.5; 5.0; 7.0; 8.0 and 8.5), reaction time (3 and 5h) and liquid phase agitation speed (450 and 600 rpm). For un-doped Mo2C and Mo2C/A.C catalyst the maximum conversion was of 23% under the conditions of 1% catalyst, 5 h reaction and oil/alcohol ration of 1/12 and pH=5-4,0, respectively. For pure activated carbon, maximum conversion (15,56%) was attained with 2% catalyst, 3 h reaction, oil/alcohol ration of 1/12 and pH=4,5. For the doped Ni-Mo2C/A.C the best conversion observed was of 21,7% with 5% catalyst, 3 h reaction, oil/alcohol ratio of 1/12 and pH=4,5. A pseudo homogeneous kinetics model was proposed, and experimental data presented agreement with a 1st order reaction with speed rate constant of 0,0009 min-1.
MEMBROS DA BANCA:
Interno - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externo ao Programa - 277058 - GILSON GOMES DE MEDEIROS
Presidente - 350247 - JOAO FERNANDES DE SOUSA