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• W2224457781 abstract "Mesoporous Ce-Mn-MCM-41 molecular sieves with Si/(Ce+Mn) molar ratios of 43, 61, 79, and 97 were synthesized under hydrothermal conditions using CTMABr (cetyltrimethylammonium bromide) as sur- factant and manganese acetate and cerium sulfate as sources of Mn and Ce, respectively . The Ce 4+ and Mn 3+ ions were coordinated to the silica surface. They were then characterized using several techniques, e.g., XRD (X-ray Diffraction), FTIR (Fourier Transform Infra-Red Spectroscopy), N2 physisorption, TG/DTA (Ther- mogravimetric/Differential Thermal Analysis), UV-vis/DRS (Diffuse Reflectance UV-vis Spectroscopy), and SEM (Scanning Electron Microscopy). XRD studies indicated that the materials had the standard MCM-41 structure. FTIR studies showed that cerium and manganese ions were incorporated into the hexagonal meso- porous materials. The thermal stabilities of the as-synthesized materials were studied using TG/DTA. A nitro- gen adsorption isotherm was used to determine the specific surface area, pore diameter, and wall thickness of the calcined Ce-Mn-MCM-41. The morphology of Ce-Mn-MCM-41 was examined using SEM. The oxidation states of the incorporated cerium and manganese ions were determined using UV-vis/DRS; from these results we conclude that the Lewis acidity of the Ce-Mn-MCM-41 with Si(Ce+Mn) = 43 was higher than that of other Ce-Mn-MCM-41 samples." @default.
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• W2224457781 date "2007-07-01" @default.
• W2224457781 modified "2023-09-24" @default.
• W2224457781 title "Synthesis and Characterization of Mesoporous Ce-Mn-MCM-41 Molecular Sieves" @default.
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