SiMCM-41 and V-MCM-41 were hydrothermally synthesized with different quantities of vanadium, characterized by small angle X-ray scattering, nitrogen physisorption, and the insertion of vanadium was assessed by temperature-programed desorption of ammonia, pyridine chemisorption followed by infrared spectroscopy and H₂ temperature-programed reduction. Vanadium-based materials are notable oxidation catalysts, however acid sites can be developed, making them potential bifunctional catalysts combining redox and Lewis acid sites. Herein, mesoporous vanadosilicates were used as acidic catalysts in the Ketalization of glycerol with acetone for solketal formation. The catalytic activity was dependent on the amount of acid sites, based on three types of vanadium oxide species: (i) isolated or (ii) oligomeric vanadium species inserted in the silica framework, i.e. -Si-O-(V-O-V)_n, where n = 1 and n > 1, respectively, and (iii) surface vanadium oxides highly dispersed or interacting with surface hydroxyl groups. By performing recycling experiments it was possible to conclude that the surface vanadium oxides species, despite of being more active, are leached by water molecules formed in the course of the reaction, decreasing the activity. On the other hand, framework vanadium are more stable Lewis acid sites for liquid-phase Ketalization reaction.

用不同量的钒水热合成SiMCM-41和V-MCM-41，其特征在于小角度X射线散射，氮物理吸附，并通过程序升温的氨解吸，吡啶化学吸附，然后红外光谱评估钒的插入光谱学和H ₂程序升温还原。钒基材料是著名的氧化催化剂，但是可以形成酸位，使其成为结合氧化还原和路易斯酸位的潜在双功能催化剂。在此，介孔的钒硅酸盐在甘油与丙酮的缩酮化中用作酸性催化剂时用于形成缩酮。基于三种类型的钒氧化物，催化活性取决于酸位点的数量：（i）分离出的或（ii）插入二氧化硅骨架中的低聚钒物种，即-Si-O-（VOV）_n分别为n = 1和n> 1，以及（iii）表面钒氧化物高度分散或与表面羟基相互作用。通过进行再循环实验，有可能得出结论，尽管表面钒氧化物物种更具活性，但仍会被反应过程中形成的水​​分子浸出，从而降低了活性。另一方面，骨架钒对于液相缩酮化反应而言是更稳定的路易斯酸位点。