Mesoporous carbon nitride grafted with n-bromobutane: a high-performance heterogeneous catalyst for the solvent-free cycloaddition of CO2 to propylene carbonate

Catal. Sci. Technol., 2014, Advance Article
DOI: 10.1039/C4CY00770K, Paper
Jie Xu, Fei Wu, Quan Jiang, Yong-Xin Li
Mesoporous carbon nitride grafted n-bromobutane shows high catalytic activity in the solvent-free cycloaddition of CO2 with propylene oxide to propylene carbonate, affording a maximum yield of 88% with a TOF up to 10.7 h-1.
Mesoporous carbon nitride grafted with n-bromobutane: a high-performance heterogeneous catalyst for the solvent-free cycloaddition of CO2 to propylene carbonate

Jie Xu,*a Fei Wu,a Quan Jianga and Yong-Xin Li*a

*Corresponding authors
aJiangsu Key Laboratory of Advanced Catalytic Materials and Technology, College of Chemistry and Chemical Engineering, Changzhou University, Gehu Road 1, Changzhou, PR China
E-mail: shine6832@163.com, liyxluck@163.com;
Fax: +86 519 86330135 ;
Tel: +86 519 86330135
Catal. Sci. Technol., 2014, Advance Article
DOI: 10.1039/C4CY00770K

A new type of mesoporous-C4N4-based catalyst (n-butBr/mp-C3N4) was prepared by simple grafting of n-bromobutane. The N2 adsorption–desorption and X-ray diffraction characterizations indicate that, in comparison with the parent mp-C3N4, the textual and structural properties have been well retained by n-butBr/mp-C3N4. In the cycloaddition of CO2 with propylene epoxide, the n-butBr/mp-C3N4 exhibits high catalytic conversion as well as a high selectivity to propylene carbonate. The maximum TOF value obtained over n-butBr/mp-C3N4 is 10.7 h−1 at 6 h under 140 °C, which compares favorably to other reported C3N4-based catalysts. In addition to n-bromobutane, mp-C3N4 materials grafted with other alkyl halides also provide high catalytic activities. According to the Fourier transform infrared and X-ray photoelectron spectroscopy measurements, it is speculated that the catalytic active sites of n-butBr/mp-C3N4 are uncondensed amines and Br anions which originate from the reaction between n-bromobutane and the N-containing heterocycles of mp-C3N4.

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