Hydrothermal Synthesis of Octahedral Molecular Sieve (OMS-1) from Mn oxide residues

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Abstract
13-014 Thayná Ferreira de Azevedo Azevedo, T.F.(Universidade Federal do Oeste do Pará); Rezende, D.d.(Universidade Federal do Oeste do Pará); Mendes, K.(Universidade Federal do Oeste do Pará); FIGUEIRA, B.A.(Universidade Federal do Oeste do Pará); Rivas Mercury, J.M.(Instituto Federal do Maranhão); This work presents a low-cost Mn starting material to synthesis manganese oxide octahedral molecular sieve with Mg2+ in the tunnel (Mg-OMS-1), based on the Mn residues from Carajás Mineral Province (Amazon, Brazil). After hydrothermal and cation exchange procedures, the Mn residues transformed to a single phase, Mg-OMS-1. The raw material and the synthesis processes were analyzed by means of X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Infrared spectroscopy (FTIR). The tunnel structure was synthesized hydrothermally at 180 °C for 3 days without impurities. According the XRD analysis, the formation of crystalline Mg-OMS-1 was identified through reflections at 9.8º, 12º and 18º (2theta), as well as a thermal stability around 300 ºC. The SEM analysis indicated that the final product presents good crystallinity with a homogeneous size. In addition, an intense and diagnostic FTIR band was identified at 515 cm-1 related to the MnO6 octahedral stretching vibrations.
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