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A series of mesoporous aluminosilicate and borosilicate molecular sieves with the MCM-41 structure have been synthesized with different SiO 2 /Al 2 O 3 or SiO 2 /B 2 O 3 mass ratios of 5, 10, 25, 50, 70 and 150. The samples were synthesized using the direct method with a duration of 48 h. As silica source colloidal silica (ludox 40%, Prolabo), as aluminium source sodium aluminates and boric acid as the boron source were used in these syntheses. All samples were characterized by X-ray diffraction (XRD), ATR-FT-IR, N 2 gassorption and elemental analysis by electron microscopy.XRD revealed that the characteristic MCM-41 structure is obtained for both mass ratios greater than 10. B-MCM-41 gives a better organization of the structure than Al-MCM-41. The B substitution in MCM-41 gives a tetrahedral configuration as proven by ATR-FT-IR. The pore diameter is very similar in both samples. To cite this article: M.