Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (3): 545-551.doi: 10.3866/PKU.WHXB201501202

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Effect of H2S Concentration on MoO3/Al2O3 and CoO-MoO3/Al2O3 Catalysts for Sulfur-Resistant Methanation

WANG Bao-Wei, LIU Si-Han, HU Zong-Yuan, LI Zhen-Hua, MA Xin-Bin   

  1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
  • Received:2014-11-06 Revised:2015-01-19 Published:2015-03-06
  • Contact: WANG Bao-Wei, MA Xin-Bin E-mail:wangbw@tju.edu.cn;xbma@tju.edu.cn
  • Supported by:

    The project was supported by the National High-Tech Research and Development Program of China (863) (2015AAJY1602).

Abstract:

The activities of 25% (mass fraction, w) MoO3/Al2O3 and 5% (w) CoO-25%MoO3/Al2O3 catalysts in a sulfur-resistant methanation process were examined as the concentration of H2S was varied from 0 to 12 mL· L-1 (volume fraction φ=0.00%-1.20%). The results showed that the catalytic activity of 5%CoO-25%MoO3/Al2O3 catalyst increased steadily as the concentration of H2S increased. However, the catalytic performance of the 25%MoO3/Al2O3 catalyst was insensitive to the H2S concentration. Co was found to benefit the 25%MoO3/Al2O3 catalyst when H2S concentration was greater than 0.40%(φ). Below this threshold, addition of Co to the catalyst matrix inhibited the activity of the 25%MoO3/Al2O3 catalyst. N2-physisorption (BET) and X-ray diffraction (XRD) analyses were used to characterize the fresh and used catalysts. The results indicated that exposure to H2S at various concentrations did not significantly affect the physical structure of the catalysts, but it will affect the active phase through metal sulfides. The results provide the appropriate range of H2S concentration to add Co as promoter for 25%MoO3/Al2O3 catalyst, which is likely to be useful for industrial catalyst selection.

Key words: Sulfur-resistant methanation, H2S concentration, MoO3/Al2O3 catalyst, Co promoter, Synthetic natural gas

MSC2000: 

  • O643.36