Gondim, Amanda DuarteBatista, Alyxandra Carla de Medeiros2025-02-122024-04-23BATISTA, Alyxandra Carla de Medeiros. Avaliação da termoconversão de microalgas pré-tratadas utilizando Molibdênio e Cobalto suportados em KIT-6. Orientadora: Dra. Amanda Duarte Gondim. 2024. 146f. Tese (Doutorado em Química) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2024.https://repositorio.ufrn.br/handle/123456789/62677A renewable and promising alternative to mitigate greenhouse gas emissions in the environment is the use of microalgae biomass. Therefore, the work aimed to evaluate the influence of pretreatment, freeze-drying and acetylation (single and double) processes applied to microalgae to obtain bioproducts by pyrolysis, as well as the application of Cobalt and Molybdenum in monometallic (5%) and bimetallic (2,5%) form for thermal and catalytic degradation studies, due to the efficiency in catalytic reactions. The kinetic study was performed using the Flynn-Wall-Ozawa (FWO) and Kissinger-AkahiraSunose (KAS) methods to evaluate the degradation of microalgal biomass. The thermodynamic parameters: Enthalpy (ΔH), Gibbs free energy (ΔG) and entropy (ΔS) were also calculated and, finally, the bio-oils were analyzed. The pyrolysis of Monoraphidium sp. confirmed that the second acetylation promoted greater bio-oil formation, reaching a yield of 40%. Based on the correlation coefficient (R2 ) values, the KAS kinetic model best suits the degradation process, presented values for Ea of 147,30; 138,60; 145,80; 144,88 and 166,43 kJ mol-1 for the following samples MA II, K6MA II, CoK6MA II, MoK6MA II and CoMoK6MA II, respectively. The average values of ΔH, ΔG and ΔS indicate that the thermal and thermocatalytic conversion of microalgae biomass is characterized as an endothermic, non-spontaneous and low-reactivity process, generating added value to the products obtained.Acesso EmbargadoQuímicaBiomassaCatalisadores mesoporososEstudo cinético e termodinâmicodoctoralThesisCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA