耐硫甲烷化中H2S浓度对MoO3/Al2O3和CoO-MoO3/Al2O3催化剂的影响

doi:10.3866/PKU.WHXB201501202

Abstract

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

WANG Bao-Wei, LIU Si-Han, HU Zong-Yuan, LI Zhen-Hua, MA Xin-Bin. Effect of H₂S Concentration on MoO₃/Al₂O₃ and CoO-MoO₃/Al₂O₃ Catalysts for Sulfur-Resistant Methanation[J].Acta Phys. -Chim. Sin., 2015, 31(3): 545-551.

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

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

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