The mesoporous silica MCM41 has properties such as a high specific surface area, tuneable pore size and a narrow pore size distribution. Rare earth oxides supported MCM41 is a promising optically functional material. MCM41 was synthesized adding the silica precursor tetraethoxysilane to an aqueous solution containing cetyl-trimethylammonium bromide and hydrochloric acid. The obtained solid was calcined at 600°C for 4h. The impregnation of MCM41 with neodymium was conducted by incipient wetness method, using neodymium nitrate solution with different Nd/Si weight ratio, followed by calcination at 550°C for 5h. Samples were characterized by several techniques. The presence of neodymium was confirmed by Energy Dispersive X-ray analysis. X-Ray Diffraction analysis indicated that the unit cell parameter a₀ increase with Nd/Si weight ratio, but MCM41 structure is not disrupted by the neodymium presence. The specific surface area decreases from MCM41 to Nd-MCM41 with increasing of neodymium content. It is probably due to the partially blocking of the mesostructure pores during impregnation.

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