Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (5): 933-940.doi: 10.3866/PKU.WHXB201503032

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Influence of Tungsten Loadings on the 1-Butene Metathesis Reaction over W/SiO2/Al2O3 Catalysts

LIU Na1, ZHANG Hui1, XUE Nian-Hua2, DING Wei-Ping2   

  1. 1 College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, P. R. China;
    2 Key Laboratory of Mesoscopic Chemistry of MOE, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
  • Received:2014-12-30 Revised:2015-02-17 Published:2015-05-08
  • Contact: LIU Na E-mail:liuna307@126.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21403164) and National Innovation Experiment Program for University Students, China (S14024).

Abstract:

A series of W/SiO2/Al2O3 catalysts with various tungsten loadings were synthesized via the impregnation method. The as-synthesized catalysts were characterized by X-ray diffraction (XRD), Raman spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy, H2 temperature-programmed reduction (H2-TPR), and NH3 temperature-programmed desorption (NH3-TPD). The results reveal that the tungsten loadings were crucial to the dispersion and reducibility of the tungsten oxide species and the acidity of catalysts. The catalytic performances were also investigated during the metathesis of 1-butene to propene. Amongst these catalysts, W/SiO2/Al2O3 with a tungsten mass fraction of 6.0% gave the highest activity and stability during the 1-butene metathesis reaction. The excellent catalytic performance of the catalyst containing a tungsten mass fraction of 6.0% is attributed to its moderate dispersion, suitable reducibility of the WOx species and suitable acidity. We speculate that these factors are favorable for the formation of active centers for olefin metathesis.

Key words: 1-Butene, Protene, Metathesis, Tungsten loading, Catalytic activity

MSC2000: 

  • O643