Preparation of rod-like V-MCM-41 and their catalytic performance

By using cetyltrimethylammonium bromide (CTAB) as the template, tetraethyl orthosilicate (TEOS) as the silica source, ammonium metavanadate (NH₄VO₃) as the vanadium source, and water/ethanol as the co-solvent, the rod-like V-MCM-41 is synthesized. The samples are characterized by XRD, SEM and N₂ adsorption-desorption. Their catalytic performances for the hydroxylation of benzene are studied. The results show that V-MCM-41 has highly ordered porous structure and large specific surface area. As the vanadium loading increases, samples gradually changes their morphology from the short rod-like shape to longer rod-like shape. At the same vanadium content, V-MCM-41 with the rod-like morphology has the better catalytic property than the sample with the bulk-like morphology.