Browsing by Author "Mora Vargas, Jorge Andrés (Director)"
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Item Aprovechamiento de alcohol fusel en la obtención de productos de valor agregado utilizando perovskitas como catalizadores(Universidad Santiago de Cali, 2024) Valencia Castro, Jessica Andrea; Orduña Ortega, Julieth (Directora); Mora Vargas, Jorge Andrés (Director)At present, the quest for renewable carbon sources to generate energy and high-value products has seen a significant rise, particularly those enabling the extraction of chemical components traditionally derived from fossil fuels. Industrial processing of sugarcane yields various renewable materials, including fusel alcohol, offering the potential for conversion into valuable compounds. The catalytic conversion of fusel alcohol (mixture of different alcohols with C3 to C5) using the Guerbet reaction has not yet been widely explored, however, some of its components have already been used as starting material for this reaction using different catalysts. Thus, this work was aimed at the conversion of fusel alcohol by the Guerbet reaction using perovskite-type oxides of La (III) as cation A and Zn (II) or Ni (II) as cation B. The oxides were obtained by the calcination of their precursors synthesized by the coprecipitation method and were well characterized by infrared spectroscopy (IR), X-ray diffraction (DRX), and thermogravimetric analysis (TGA). The TGA curves showed the complete decomposition of the precursors at 900 °C in 4 hours. XRD patterns confirm the formation of the perovskite phase. In addition, IR spectra of the synthesized materials show vibrations indicating the presence of Ni-O and Zn-O bonds. In the catalytic conversion of fusel alcohol, different groups of compounds were obtained, such as alcohols, esters, ethers, and ketones.Item Aprovechamiento del alcohol fusel utilizando la reacción de Guerbet catalizada por óxidos metálicos mixtos modificados con Zn2+/Co2+ y Zn2+/Fe2+(Universidad Santiago de Cali, 2024) López Gómez, Angie Lorena; Orduña Ortega, Julieth (Directora); Mora Vargas, Jorge Andrés (Director)The search for methods for synthesizing value-added chemicals using renewable raw materials is constantly increasing, so the use of products and by-products derived from the industrial processing of sugar cane is of particular interest, such as fusel oil, which has been little studied as a substrate in the Guerbet reaction, which allows the synthesis of alcohols from longer chains and other products through parallel reactions. In this work, the catalytic conversion of fusel alcohol with mixed metal oxides (MMOs) derived from hydrotalcites (HDLs) modified with Zn2+/Fe2+ and Zn2+/Co2+.Zn2+/Fe2+ and Zn2+/Co2+ . The HDLs were synthesized by the coprecipitation method and through a subsequent heat treatment their respective OMMs were obtained. The materials obtained were characterized by infrared (IR) and Raman spectroscopy, thermogravimetric analysis (TGA), X-ray diffraction (DRX) and scanning electron microscopy (SEM), where their correct synthesis was confirmed. The catalytic conversion of the fusel alcohol was performed in a Bach-type reactor. Different physicochemical parameters were studied in the reaction and their products were identified by gas chromatography coupled to mass spectrometry detector. It was mainly evidenced the formation of families of alcohols and esters, followed by aldehydes, ketones and olefins, which was probably influenced mainly by the degree of acidity of MMOs according to the literature.Item Conversión catalítica de alcohol fusel y etanol utilizando perovskitas del tipo LaM2+O3 como catalizadores(Universidad Santiago de Cali, 2022) Rojas Rivas, Sofia; Orduña Ortega, Julieth (Directora); Mora Vargas, Jorge Andrés (Director)Currently, the development of more environmentally friendly methodologies to produce value-added compounds (PVA) from renewable raw materials has been increasing, mainly for the production of derivatives from fossil sources. Among these raw materials, the products obtained from the industrial processing of sugar cane become important substrates for obtaining these compounds. Fusel alcohol (mixture of different low molecular weight alcohols), obtained as a by-product in the process of obtaining bioethanol via fermentation routes has become a raw material little explored to produce PVA. In addition, its use as a substrate in the Guerbet reaction (RG) has not yet been investigated, therefore, in this work it was proposed catalytic conversion by RG to obtain PVA, added, experiments were performed with ethanol, since this has already been used in GR with heterogeneous catalysts. For this, the use of catalysts possessing acid/base and hydrogenation/dehydrogenation properties such as perovskite type materials are necessary. For this reason, the synthesis, characterization (DRX, Raman, TGA, FTIR and SEM) was performed and use as heterogeneous perovskite catalysts of type LaM2+O3 where M2+ = Cu2+ or Co2+ in the catalytic conversion of fusel alcohol and ethanol using a low pressure fixed bed reactor in order to determine its influence on the type of pervoskitas and how it varies depending on the reaction conditions, added, the products obtained in both reactions were identified by means of CG-EM. They were obtained as main products in the reaction with fusel alcohol alkenes, aldehydes, ketones, alcohols and esters, on the other hand, in the reactions with ethanol, acetaldehyde and 1-butanol was obtained, among other products due to secondary reactions. In the first case, it is necessary to continue the investigation in order to determine some possible routes of formation of the mostly obtained compounds; in the second instance, reactions tended to follow the Guerbet reaction path along with secondary reactions based on the hydrogenation and dehydrogenation of molecules.Item Coprecipitación de hidrotalcitas y aplicación de sus óxidos en la síntesis de bases de Schiff derivadas de 2-aminotiazol y aldehídos aromáticos(Universidad Santiago de Cali, 2021) Granja Banguera, Claudia Patricia; Morales Morales, Jimmy Alexander (Director); Mora Vargas, Jorge Andrés (Director)Recently, the development of new methodologies for the synthesis of products with value-added has increased, especially, the obtaining of compounds that present in their structure sulfur and nitrogen atoms mainly in heterocyclic rings, and that also contain other types of functional groups. For example, imine group (-C=N-), because they are of great importance for their applications as anticancer, antibacterial, antifungal, antiinflammatory agents, among others. Herein, we the synthesis of 1-phenyl-N-(thiazol-2-yl)methanimine (Schiff's base, SB) derived from 2-aminothiazole and benzaldehyde using mixed metal oxides (MMOs) derived from hydrotalcites (LDHs) modified with Ni2+ and Cu2+. The LDHs were synthesized by coprecipitation method, and their subsequent thermal treatment provided the corresponding MMOs. MMOs were investigated for imines synthesis in solvent free and microwave-assisted conditions. The physicochemical characterization of the LDHs demonstrated the insertion of Ni2+ and Cu2+ ions in the lamellar structure and no secondary phase formation was observed. XRD of the MMOs obtained showed the decrease in the crystallinity of the precursor and the formation of three characteristic peaks of this type of oxides, proving they are obtaining. SB was obtained with 51.3% yield when the MMO modified with 15% Cu2+ as catalyst and 1.0 equivalent of each of the starting reagents was used in 10 min of reaction at 300 W and 125 ° C.