Braga, Tiago PinheiroAlves, Layssa Cristine2023-03-112023-03-112022-12-20ALVES, Layssa Cristine. CONVERSÃO CATALÍTICA POR DESIDRATAÇÃO DO GLICEROL A BIOPRODUTOS UTILIZANDO SÓLIDOS A BASE DE ZnO/Al2O3. 2022. 56f. Trabalho de Conclusão de Curso (Graduação em Química do Petróleo), Centro de Ciências Exatas e da Terra, Instituto de Química, Universidade Federal do Rio Grande do Norte, Natal, 2022.https://repositorio.ufrn.br/handle/123456789/51874In the quest to suppress the release of greenhouse gases, green routes are currently employed. In this branch, there is the production of biofuels that has been intensified more and more. However, there is too much production of biodiesel in the world, which ends up generating a large amount of glycerol as a by-product of the transesterification reaction. As a solution to this bottleneck, an applicability becomes interesting in order to improve and favor the production of this fuel from a renewable source, making it profitable and sustainable. One of the routes is in its conversion to higher added value products via heterogeneous catalysis, using transition metal oxides. Thus, in this work, oxides based on Zn and Al were synthesized by the Pechini method, for use in the dehydration reaction of glycerol. Characterizations were made by different techniques, namely XRD, XRF, NMR, SEM, TG and FTIR for analysis of their properties. In the XRD technique, one can see a material made up of crystalline parts, where characteristic peaks of ZnO, Al2O3 and ZnAl2O4 were observed. By XRF, high concentrations of zinc were obtained while aluminum showed low expected concentrations compared to its oxides. The 27Al NMR was carried out in order to observe the coordination of aluminum, which proved to be predominantly octahedral, characteristic of the alumina phase where the Al3+ sites are octahedral. The SEM results determined the spongy-like morphology, showing high porosity, which is expected for materials used as catalysts. With the TG data, the presence of initial events of water desorption, carbon burning at 270°C and the decomposition of possible carboxylates at 800°C can be noted. According to the FTIR, the characteristic adsorption bands of carboxylates were found at 1464 cm-1, vibrational stretches of C–O and C=O and hydroxyl groups attached to metals at 1605 cm-1, the presence of C-H groups at 2850 cm-1 and OH groups referring to angular deformations of adsorbed remaining water at 3350 cm-1. The catalysts obtained showed glycerol conversions consistent with the reaction conditions, with 31.01% being the highest. In addition, Zn10Al90 with N2 pretreatment achieved a higher percentage of selectivity to acetol and 1,2-propanediol.Attribution-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nd/3.0/br/GlicerolGlycerolCatálise HeterogêneaHeterogeneous CatalysisDesidratação do GlicerolGlycerol DehydrationAcetolAcetol1,2-propanodiol1,2-propanediolQuímica do PetróleobachelorThesisCNPQ::CIENCIAS EXATAS E DA TERRA