A facile post-synthetic strategy was developed to functionalize the preformed hollow mesoporous silica spheres by encapsulating the molybdenum dioxide (MoO₂) nanoparticles inside the interior cavity. Hollow mesoporous silica spheres were prepared and employed as carriers, and the encapsulation of MoO₂ nanoparticles was achieved through a one-pot hydrothermal protocol. After characterization, the encapsulated MoO₂ nanoparticles were certified to be ultrafine and highly dispersed, which greatly promoted the catalytic activity. The as-prepared catalysts were utilized in epoxidation of alkenes and exhibited as a promising catalyst in this reaction. After reacting for 10 h, the optimal catalyst MoO₂@SiO₂-1 achieved a conversion above 95% and selectivity above 95%, respectively. Moreover, the catalysts also exhibited good reusability, conversion of 78% and selectivity of 89% (reaction time 4 h) were still obtained after recycling for 5 times. Meanwhile, the employed facial and efficient hydrothermal approach could be expanded to other molybdenum modified heterogeneous catalysts in various applications.

通过将二氧化钼（MoO ₂）纳米粒子封装在内部空腔中，开发了一种简便的合成后策略来功能化预制的中空介孔二氧化硅球。制备了空心介孔二氧化硅球并将其用作载体，并且通过一锅水热方案实现了MoO ₂纳米粒子的包封。表征后，证明包封的MoO ₂纳米颗粒是超细且高度分散的，大大提高了催化活性。所制备的催化剂用于烯烃的环氧化中，并在该反应中表现出有希望的催化剂。反应10 h后，最佳催化剂MoO ₂ @SiO ₂-1分别达到95％以上的转化率和95％以上的选择性。此外，该催化剂还显示出良好的可重复使用性，在循环5次后仍获得78％的转化率和89％的选择性（反应时间为4小时）。同时，所采用的表面和有效的水热方法可以在各种应用中扩展到其他钼改性的非均相催化剂。