Abstract
Bismuth containing MCM-41 with high Bi content (8.3 wt%, 10.3 wt%, 12.2 wt %, 14.5 wt %) was directly synthesized in strongly acidic media. The characterization of PXRD (Powder X-ray diffraction) and N 2 adsorption/desorption conformed that the samples have typical MCM-41 channel structure, and UV–vis (Diffuse reflectance UV–visible spectroscopy) and Raman analyse revealed that all bismuth atoms were highly dispersed in the silica-based framework structure. XPS (X-ray photoelectron spectroscopy) analyse suggested that the distribution of bismuth atoms in the samples is not uniform entirely, and the content of Bi in Bi-MCM-41 maybe degressive from the internal surface to external surface under the given synthesis conditions. Furthermore, it was found that the binding energy of Bi4f 7 and Bi4f 5 are decreased with the Bi content of MCM-41 increasing.
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