Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (09): 2422-2428.doi: 10.3866/PKU.WHXB20100901

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Catalytic Performance of Porous SiO2·xH2O Supported RuB Nanoparticles for the Hydrogenation of Quinoline

ZHANG Lei, HU Bo, CHEN Hua, LI Xian-Jun, LI Rui-Xiang   

  1. Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
  • Received:2010-02-19 Revised:2010-05-24 Published:2010-09-02
  • Contact: LI Rui-Xiang E-mail:sculiruixiang@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21072138).

Abstract:

A porous and hydroxyl group-rich catalyst RuB/SiO2·xH2O was prepared by hydrolyzing ethyl silicate, protecting SiO2·xH2O with polyvinyl pyrrolidone (PVP), and etching SiO2·xH2O with NaOH. The catalyst was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Fourier transforminfrared (FT-IR) spectroscopy, and BET (Brunauer-Emmett-Teller). We found that the catalyst showed excellent performance for the hydrogenation of quinoline under mild condition. At a hydrogen pressure of 3.0 MPa and a reaction temperature of 80 ℃, the conversion of quinoline reached 95% and the selectivity for 1,2,3,4- tetrahydroquinoline was 97%. This porous catalyst also showed an excellent anti-poisoning characteristic. The catalyst can be reused several times. We also investigated the effect of surface hydroxyl groups and the solvent on catalytic activity and selectivity. The results showed that using water as a solvent leads to higher catalyst activity and selectivity for the hydrogenation of quinoline. The mechanism of quinoline hydrogenation over the catalyst is discussed. The coordination of the nitrogen on quinoline onto the surface of ruthenium nanoparticles, the effect of hydrogen bond among the surface hydroxyl groups of the catalyst and the nitrogen present in quinoline and in the water solvent were favorable for the adsorption of the substrate and the desorption of the products fromthe surface of the catalyst.

Key words: Ruthenium, /SiO2·xH2O, Quinoline, Hydrogenation, Tetrahydroquinoline

MSC2000: 

  • O643