Encapsulated ultrafine and highly dispersed molybdenum dioxide nanoparticles in hollow mesoporous silica spheres as an efficient epoxidation catalyst for alkenes

Publication date: Available online 1 August 2019Source: Journal of Saudi Chemical SocietyAuthor(s): Yirui Shen, Pingping Jiang, Phyu Thin Wai, Pingbo Zhang, Yuming DongAbstractA 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 for epoxidation of alkenes. 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.Graphical abstractUltrafine and highly dispersed MoO2 nanoparticles were encapsulated in hollow mesoporous silica spheres as yolk-shell nanoreactors for efficient alkenes epoxidation.
Source: Journal of Saudi Chemical Society - Category: Chemistry Source Type: research