Melo, Marcus Antônio de FreitasMiranda, Auristela Carla de2014-12-172014-03-132014-12-172011-11-28MIRANDA, Auristela Carla de. Síntese e impregnação de peneiras moleculares Fe MCM-41 derivada de sílica da casca do arroz. 2011. 41 f. Dissertação (Mestrado em Processamento de Materiais a partir do Pó; Polímeros e Compósitos; Processamento de Materiais a part) - Universidade Federal do Rio Grande do Norte, Natal, 2011.https://repositorio.ufrn.br/jspui/handle/123456789/12727The mesoporous molecular sieves of the MCM-41 and FeMCM-41 type are considered promissory as support for metals used as catalysts in oil-based materials refine processes and as adsorbents for environmental protection proposes. In this work MCM-41 and FeMCM41 were synthesized using rice husk ash - RHA as alternative to the conventional silica source. Hydrothermal synthesis was the method chosen to prepare the materials. Pre-defined synthesis parameters were 100°C for 168 hours, later the precursor was calcinated at 550°C for 2 hours under nitrogen and air flow. The sieves containing different proportions of iron were produced by two routes: introduction of iron salt direct synthesis; and a modification post synthesis consisting in iron salt 1 % and 5% impregnation in the material followed by thermal decomposition. The molecular sieves were characterized by X ray diffraction XRD, Fourier transform infrared spectroscopy FT-IR, X ray fluorescence spectroscopy XFR, scanning electronic microscopy SEM, specific surface area using the BET method, Termogravimetry TG. The kinetic model of Flynn Wall was used with the aim of determining the apparent activation energy of the surfactant remove (CTMABr) in the MCM- 41 porous. The analysis made possible the morphology characterization, identifying the presence of hexagonal structure typical for mesoporous materials, as well as observation of the MCM41 and iron of characteristic bands.application/pdfAcesso AbertoCerâmicaCatáliseSíntese hidrotermalPeneira molecular Fe MCM-41Sílica (CCA)Ferro.CeramicsCatalysisHydrothermal synthesisMolecular sieve Fe MCM-41Silica (RHA), Iron.masterThesisCNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA