Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/11210
Title: Síntese e aplicação de catalisadores à base de óxidos de cério, tungstênio e HZSM-5 para a produção do biodiesel
Other Titles: Synthesis and catalytic application cerium oxide, tungsten e HZSM-5based production for biodiesel
Authors: Magriotis, Zuy Maria
Saczk, Adelir Aparecida
Souza, Josefina Aparecida de
Oliveira, Juliano Elvis
Lofrano, Renata Carolina Zanetti
Keywords: Óxidos mistos
Esterificação
Sulfatação
Catalisadores heterogêneos
Ácido oleico
Mixed oxides
Cerium
Tungsten
HZSM-5 esterification
Biodiesel
Issue Date: 31-May-2016
Publisher: Universidade Federal de Lavras
Citation: COELHO, S. M. Síntese e aplicação de catalisadores à base de óxidos de cério, tungstênio e HZSM-5 para a produção do biodiesel. 2016. 150 p. Tese (Doutorado em Agroquímica)-Universidade Federal de Lavras, Lavras, 2016.
Abstract: This work presents a study on the production of biodiesel by esterification reaction of oleic acid with methanol using batch reactor and different catalysts based on CeO2 and WO3 and HZSM-5. Acid treatment was performed in order to increase the catalytic activity. Different characterization techniques were performed, among them X-ray diffraction (XRD), Thermogravimetric analysis TGA/DTA, Spectroscopy in the Region in Fourier Transform Infrared (FTIR) and X-ray fluorescence (XRF). The effects of independent variables: temperature, molar ratio of oil: alcohol and the amount of catalyst and their interactions on the dependent variable (conversion of oleic acid to the corresponding ester). Overall, through the results obtained in the characterization was observed that the applied treatments were efficient, however the XRF technique, indicated that tungsten oxide leaching could occur during the preparation of the materials. The treatments performed on HZSM-5 caused no significant changes in the structure indicating that the zeolite was quite resistant to the treatments used. It was evaluated using complete 23 factorial design. For the catalysts investigated, the best reaction conditions were obtained when using higher levels of the independent variables temperature and amount of catalyst. However, for the variable molar ratio the lowest level showed significant yields for most of the synthesized catalyst, obtaining maximum conversion to the OC (67.97%), OW (74.37%), HZSM-5 (61.16%) OC-OW 1 (75.93%), OC-OW 2 (82.57%), OC-OW 3 (79.15%), S/OC-OW 1 (86.90%), S/OC-OW 2 (91.04%), S/OC-OW 3 (88.60%), S/OC-OW/H 1 (92.34%), S/OC-OW/H 2 (100%) and S/OC-OW/H 3 (98.16%). According to the experimental design, the temperature has the biggest influence on the reaction variable for all the synthesized catalysts. Among the catalysts investigated S/OC-OW/H 2 e S/OC-OW/H 3 were more effective. Reuse tests showed that the catalyst activity decreased after each cycle, indicating that the regeneration process was effective. The leaching test indicated that the catalysts are heterogeneous in the evaluated operating range. The catalysts investigated showed themselves promising for the production of biodiesel.
URI: http://repositorio.ufla.br/jspui/handle/1/11210
Appears in Collections:Agroquímica - Doutorado (Teses)



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