Journal
MOLECULAR CATALYSIS
Volume 504, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mcat.2021.111441
Keywords
Molybdenum; C3N4; Photocatalytic; Epoxidation
Categories
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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A lamellar porous Mo-modified carbon nitride polymer (CN-Mo) was successfully prepared by a self-assembly bottom-up method, which showed excellent optical properties and catalytic activity, enabling efficient epoxidation of olefins under mild conditions.
A lamellar porous Mo-modified carbon nitride polymers (CN-Mo) was successfully prepared by a simple bottom-up method, which involves molecule self-assembly by hydrogen bonding between uracil and melamine. Analysis Results of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS) show that Mo element has been doped in the skeleton of carbon nitride. The optical characterization results of the as-prepared photocatalysts show that, CN-Mo has a suitable band structure that can promote the separation of carriers and expands the absorption of light. Compared with CN, CN-Mo has better photocatalytic activity for epoxidation of olefins. When the mass value (relative to melamine) of ammonium molybdate tetrahydrate is 2 %, the photocatalytic efficiency is the best for the epoxidation of styrene. And the conversion rate of styrene reaches 38.4 % and the selectivity of styrene oxide is up to 83.2 %. In addition, it can maintain the better photocatalytic performance for the epoxidation of styrene after five reaction-regeneration cycles. This finding provides an effective development direction for photocatalytic olefins epoxidation under mild conditions.
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