In this work, mixed oxides of LaxCa1-xMnO3 perovskite type (x = 0, 0.5 and 1.0) were synthesized through modified proteic method using collagen and calcination process at 700 °C/2 h in order to remove the commercial textile dye Bezaktiv Blue S-MAX from water. Oxides were characterized using XRD, FTIR, N2 physisorption, SEM and PZC techniques while the dye only by the first two techniques. The XRD showed that perovskite monophase was obtained for x = 0.5 and 1.0. However, for x = 0, the low crystalline perovskite phase was obtained in the midst of precursor oxides. FTIR showed adsorption process did not damage the adsorbents structure. The successful obtained materials have meso and macroporous with slit or cavity shape, rough surface and particles with varying sizes. The pseudo-second order model was the one that best fit the kinetic data. The process must occur through electrostatic surface interactions between the adsorbent surface and the dye molecule. For the equilibrium study, Langmuir isotherm is the most suitable when used LaMnO3 adsorbent, while Freundlich isotherm was better suited when used the other two materials. The adsorbents were termally regenerated and reused five times. The best performance was exhibited by LaMnO3.
O objetivo deste trabalho foi estudar a síntese e caracterização de catalisadores micro-mesoporosos e sua aplicação na reação modelo de conversão de isopropilbenzeno em microreator catalítico de leito fixo com fluxo contínuo visando à obtenção de olefinas. Catalisadores micro-mesoporosos do tipo HZSM-5/MCM-41e La/HZSM-5/MCM-41foram sintetizados através do método mecanosíntese e impregnação por via úmida, respectivamente. Os catalisadores foram caracterizados por difração de raios-X e através de reações com molécula modelo. Isopropilbenzeno (cumeno) foi usado como molécula modelo e a conversão em olefinas foi avaliada através da formação de propeno. Os difratogramas de raios-X indicaram que os catalisadores sintetizados apresentam os picos característicos da estrutura microporosa (zeólita ZSM-5) e a estrutura mesoporosa (MCM-41). Para os catalisadores contendo lantânio, picos devido à presença de óxido de lantânio também foram identificados. Os resultados indicaram que o catalisador compósito La/HZSM-5/MCM-41 foi o mais promissor na conversão do cumeno e produção de propeno.
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