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Highly porous cobalt and molybdenum-containing ordered silica applied to pyrolysis of sunflower oil into bio-hydrocarbons

2023; Elsevier BV; Volume: 215; Linguagem: Inglês

10.1016/j.renene.2023.118962

1879-0682

M. Souza, Francisco Aléxis Dantas Maia, Vasco Lima Pinto, Maria J. F. Costa, Aruzza Mabel de Morais Araújo, Djalma Ribeiro da Silva, Anne Gabriella Dias Santos, Amanda Duarte Gondim,

Catalysis and Hydrodesulfurization Studies

The growth of the global population continues to increase the demand for energy. Petroleum-based fuels are the most used, resulting in very high emissions of greenhouse gasses. The aim of this present work was to undertake a kinetic study of the production of bio-hydrocarbons from oil sunflower, using catalysts composed of ordered mesoporous silica MCM-41 impregnated with cobalt and molybdenum oxides. The catalysts synthesized in this study underwent characterization using XRD, FRX, FTIR, SEM and TGA analysis. Thermal & catalytic kinetics approaches used in the research were the Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose methods. The TGA analyses revealed catalytic activity of the synthesized materials and their ability to reduce the activation energy (Ea) during the degradation/volatilization process of sunflower oil. Notably, Mo/MCM-41 exhibited the most significant reduction in Ea, approximately 44%. In the thermal pyrolysis process without a catalyst, the percentage of hydrocarbons formed was 16%, while in the catalytic pyrolysis, the percentages of hydrocarbons obtained were 28% (MCM-41), 16% (Mo/MCM-41), 21% (Co/MCM-41), and 45% (Co–Mo/MCM-41). For MCM-41, 8% was in the gasoline range, 29% was in the biokerosene range, and 62% was in the green diesel range. For the Mo/MCM-41, Co/MCM-41, and Co–Mo/MCM-41 catalysts, the biokerosene range corresponded to 24%, 27%, and 19%, while the green diesel range corresponded to 75%, 72%, and 80%, respectively.