Sousa, João Fernandes deAlexandrino, Angelinne Costa2017-12-132017-12-132017-09-29ALEXANDRINO, Angelinne Costa. Avaliação de catalisadores a base de carvão da pirólise do lodo de esgoto e carbetos de molibdênio na transesterificação metílica do óleo de soja. 2017. 135f. Tese (Doutorado em Engenharia Química) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2017.https://repositorio.ufrn.br/jspui/handle/123456789/24504For 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 catalysts 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 to 5%), oil/alcohol ratio (1/6 to 1/18), pH (2.0 to 8.5), reaction time (3 and 5h) and liquid phase agitation speed (450 and 600 rpm). For all conditions and other catalysts, biodiesel was produced. The maximum conversion found was 27.34% for the Mo2C/A.C catalyst under the operating conditions of 1% catalyst, 6 h reaction, oil/alcohol ration of 1/12 and pH = 5. In the characterization analysis of a sample of biodiesel produced the flash point presented a value of 141 ºC, which is above the minimum specified by the ANP. A pseudo homogeneous kinetics model was used, and experimental data presented agreement with a 1st order reaction with speed rate constant of 0,0009 min-1.Acesso AbertoÓleo de sojaTransesterificaçãoCarbetos de molibdênioCarvão do lodo de esgotoBiodieselModelo cinéticodoctoralThesisCNPQ::ENGENHARIAS::ENGENHARIA QUIMICA