Abstract
The cerium-containing MCM-41 (Ce-MCM-41) has been synthesized by direct hydrothermal method. The low-angle XRD patterns revealed the typical five major peaks of MCM-41 type hexagonal structures. The interplanar spacing d100 = 38.4 Å was obtained that can be indexed on a hexagonal unit cell parameter with ao = 44.3 Å which was larger than that of pure siliceous MCM-41 (Si-MCM-41). Transmission electron micrograph shows the regular hexagonal array of uniform channel characteristics of MCM-41. The BET surface area of Ce-MCM-41 was 840 m2/g, which is much reduced as compared to that of Si-MCM-41, with the pore size of 26.9 Å and mesopore volume of 0.78 cm3/g were measured by nitrogen adsorption-desorption isotherm at 77 K. Along with the results, the synthesized Ce-MCM-41 exhibited a well-ordered MCM-41-type mesoporous structure with the incorporation of cerium. Using Ce-MCM-41 as a support, the Rh (0.5 wt%) catalyst exhibited very high activity for the NO/CO reactions.
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