Journal
JOURNAL OF POROUS MATERIALS
Volume 28, Issue 3, Pages 779-789Publisher
SPRINGER
DOI: 10.1007/s10934-021-01031-1
Keywords
Mesoporous silica; Molybdenum trioxide; Heterogeneous catalyst; Epoxidation
Funding
- fundamental Research Funds for the Central Universities [JUSRP51507]
- MOE
- SAFEA
- 111 Project [B 13025]
- International Joint Research Laboratory for Biomass Conversion Technology at Jiangnan University
- International exchange and cooperation projects [BX 2019018]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [1042050205205978]
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Highly dispersed molybdenum trioxide was loaded into three-dimensional dendritic mesoporous silica nanospheres (MoO3@3D-DMSNs) via a one-pot method. These MoO3@3D-DMSNs showed better catalytic performance for olefin epoxidation, with optimal conditions at a Mo/Si molar ratio of 5%. The catalysts maintained their activity and stability after five reaction-regeneration cycles, demonstrating good potential for catalytic reactions.
Highly dispersed molybdenum trioxide were loaded in three-dimensional dendritic mesoporous silica nanospheres (MoO3@3D-DMSNs) by one-pot method. The mesoporous silica nanospheres with central radical channels were obtained through the interaction of bisurfactant and molybdenum source and the as-synthesized MoO3@3D-DMSNs were characterized by specific tests. As a result, the as-prepared MoO3@3D-DMSNs exhibited better catalytic performance for epoxidation of olefins. When the molar ratio value of Mo and Si is 5%, the specific surface area (S-BET = 185.8 m(2)/g) and pore volume (V-p = 0.46 cm(3)/g) of MoO3@3D-DMSNs reach a maximum, and the catalytic activity is the best for the epoxidation of cyclooctene. The conversion could reach 84% with a selectivity above 98% after 6 h. The better catalytic performance can be maintained after five reaction-regeneration cycles. The dendritic mesoporous structure can be well preserved after recycling. Additionally, olefins with electron-absorbing group exhibit better catalytic activity with MoO3@3D-DMSNs-5 as catalyst. Hence, MoO3@3D-DMSNs catalysts with the center-radial oriented channel exhibit good activity and stability. The central radial channel can effectively disperse the active center MoO3 and play a key role in the transmission and accessibility of substrates, and it would have a good application prospect in the catalytic reactions.
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