4.7 Article

Effect of the Si/Ce molar ratio on the textural properties of rare earth element cerium incorporated mesoporous molecular sieves obtained room temperature

Journal

APPLIED SURFACE SCIENCE
Volume 255, Issue 23, Pages 9425-9429

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2009.07.046

Keywords

Ce-incorporated mesoporous molecular sieve; Room temperature; Synthesis; Characterization; Textural property

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Rare earth Ce-incorporated MCM-41 mesoporous molecular sieves (CeMCM-41) were synthesized via a direct and nonhydrothermal method at room temperature from sodium silicate and ammonium cerium (IV) nitrate as raw materials. Cetyltrimethyl ammonium bromide ( CTAB) was used as a template. The resultant samples were characterized by means of powder X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance ultraviolet visible spectroscopy (UV-vis) and N(2) physical adsorption, respectively. The effect of the Si/Ce molar ratio on the crystalline structure and textural properties of CeMCM-41 was also investigated. The experimental results show that ordered CeMCM-41 mesoporous molecular sieves were successfully synthesized at room temperature and the resultant mesoporous materials have specific surface areas in the range of 594-1369 m(2)/g and average pore sizes in the range of ca. 2.5-2.8 nm. It has been found that the structural properties are strongly related to the amounts of cerium incorporation. When the cerium content increased in the samples, the intensity of the peak (1 0 0) was gradually reduced, and the surface area and structural regularity were diminished. (C) 2009 Elsevier B. V. All rights reserved.

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