Citation: LI Zhen-hua, QU Jiang-lei, WANG Wei-han, WANG Bao-wei, MA Xin-bin. Effect of CO₂ in syngas on methanation performance of Mo-based catalyst[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(8): 985-992. shu

Effect of CO₂ in syngas on methanation performance of Mo-based catalyst

Key Lab for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Corresponding author: WANG Wei-han, wangwh@tju.edu.cn MA Xin-bin, xbma@tju.edu.cn
Received Date: 29 February 2016
Revised Date: 23 April 2016

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The methanation of synthesis gas is the key process of coal to natural gas. Considering the existence of CO₂ in the synthesis gas, it is important to investigate the influence of CO₂ on the sulfur-resistant methanation. In this paper, the effect of CO₂ on methanation activity of Mo-based catalysts was investigated at the reaction temperature of 550℃ and the gas space velocity of 5000h^-1 with the syngas containing 1.2% H₂S (volume ratio). The results show that the promoter Co and the cerium-aluminum composite support can improve the stability of the catalyst and reduce the deactivation. The CO₂ is proved to promote the reverse water gas shift reaction, which would inhibit the activity of MoO₃/Al₂O₃ catalyst more heavily than MoO₃-CoO/CeO₂-Al₂O₃ catalyst. When the CO₂ adding to the inlet gas is less than 10% for 20h, the catalyst activity could be restored to its original activity after stopping the addition of CO₂. However, as the added CO₂ in inlet gas is over 10%, more H₂O will be generated through reverse water gas shift reaction to damage the catalyst structure and decrease the active component, resulting in an irreversible loss of catalyst activity.
- sulfur-resistant methanation,
- Mo-based catalyst,
- carbon dioxide,
- deactivation,
- water-gas shift
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Effect of CO2 in syngas on methanation performance of Mo-based catalyst

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Effect of CO₂ in syngas on methanation performance of Mo-based catalyst