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• W2039098333 abstract "Ce-containing MCM-41 materials were prepared via a direct, nonhydrothermal method at room temperature from tetra-ethoxysilane, n-hexadecyl trimethyl ammonium bromide, ammonia solution, and cerium(IV) ammonium nitrate precursors. Composite materials containing the nominated ratios of 5 and 10% (w/w) CeO2/MCM-41 were targeted. The obtained materials were investigated by TGA, DSC, FTIR, diffuse reflectance UV–vis, XRD, N2 adsorption/desorption isotherms, and SEM. Results indicated the insertion of cerium ions in tetrahedral environment in the framework of MCM-41. BET surface area amounting to 824 and 726 m2/g; total pore volume amounting to 0.427 and 0.515 cm3/g; and narrow pore size distribution maximizing at 22.5 and 23.7 Å, respectively were obtained for the 5 and 10% CeO2/MCM-41 calcined composites. SEM showed a spherical type morphology for the composites which is rather similar to their blank MCM-41, and no clear ceria aggregates were observed on the external surfaces of composites spherical particles. Thus, the adopted method allows the persistence of MCM-41 texture with cerium inserts in the framework of MCM-41 and/or forms finely divided ceria nanoparticles on the wall of MCM-41 materials. Moreover, stabilization of any formed ceria nanoparticles was attributed to the short nonintersecting porous nature of MCM-41 matrix, which hinders their aggregation upon calcinations." @default.
• W2039098333 created "2016-06-24" @default.
• W2039098333 creator A5008804421 @default.
• W2039098333 date "2007-11-01" @default.
• W2039098333 modified "2023-10-14" @default.
• W2039098333 title "Cerium modified MCM-41 nanocomposite materials via a nonhydrothermal direct method at room temperature" @default.
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• W2039098333 doi "https://doi.org/10.1016/j.jcis.2007.07.030" @default.
• W2039098333 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17714729" @default.
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