Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (4): 457-461.DOI: 10.1016/S1872-2067(14)60059-0

• Communications • Previous Articles     Next Articles

Core-shell TiO2@SiO2 catalyst for transesterification of dimethyl carbonate and phenol to diphenyl carbonate

Rongzhi Tanga,c, Tong Chena, Yong Chenb, Yuanzhuo Zhanga,c, Gongying Wanga   

  1. a Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China;
    b Department of National Defence Architectural Planning and Environmental Engineering, Logistic Engineering University, Chongqing 401311, China;
    c University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-12-30 Revised:2014-01-24 Online:2014-03-20 Published:2014-03-21
  • Supported by:

    This work was supported by the National High Technology Research and Development Program of China (863 Program, SS2013AA031703), Sichuan Province Science and Technology Support Program (2013GZX0135), Sichuan Province Science and Technology Innovation Research Team Program (2013TD0010).

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Abstract:

Core-shell TiO2@SiO2 was prepared using a combination of reverse microemulsion and precipitation methods and used as a heterogeneous catalyst for the transesterification of dimethyl carbonate and phenol. TiO2@SiO2 calcined at 200 ℃ gave the best catalytic performance. When the amount of catalyst was 0.20 g, the phenol conversion and transesterification selectivity were 41.8% and 100%, respectively. Transmission electron microscopy was used to characterize the core-shell TiO2@SiO2 structure, and the results showed that TiO2@SiO2 is bilayer with a TiO2 core of diameter 220-300 nm and SiO2 shell of thickness 40-60 nm. The TiO2@SiO2 was reusable, and phenol conversion remained above 40% when the TiO2@SiO2 was used four times. The catalytic performance of TiO2@SiO2 in the transesterification of dimethyl carbonate and phenol was promoted by the formation of Ti-O-Si bonds.

Key words: Core-shell, TiO2@SiO2, Diphenyl carbonate, Dimethyl carbonate, Transesterification