Abstract
Chromium and cerium incorporated into MCM-48 framework are hydrothermally synthesized via sol–gel process without any additives and characterized by X-ray diffraction, N2 adsorption/desorption, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Diffuse reflectance UV–vis spectroscopy, and Thermogravimetric analysis. Results indicate that the materials possess a long-range ordered structure, high specific surface area, and narrow pore size distribution. SEM images illustrate the edge-truncated octahedron morphology of Cr-MCM-48 while Ce-MCM-48 preserves the truncated octahedron of the MCM-48 parent material. TEM images show the pore network of Ia3d symmetry after loading metals. Spectroscopic data confirm the existence of metals in the framework and extra-framework. At low Cr content, Cr-MCM-48 contains only Cr(VI) species while rich Cr content loading results in both the Cr(VI) and Cr(III) species. The hydrothermal stability of MCM-48 is enhanced by carefully incorporating metals into the parent material.
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Acknowledgments
This research is financially supported by the Thailand Research Fund and the Center for Petroleum, Petrochemicals, and Advanced Materials, Chulalongkorn University, Thailand. The authors would like to thank Mr. John M. Jackson for English proofreading.
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Longloilert, R., Chaisuwan, T., Luengnaruemitchai, A. et al. Synthesis and characterization of M-MCM-48 (M = Cr, Ce) from silatrane via sol–gel process. J Sol-Gel Sci Technol 61, 133–143 (2012). https://doi.org/10.1007/s10971-011-2602-9
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DOI: https://doi.org/10.1007/s10971-011-2602-9