催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (10): 1604-1609.DOI: 10.1016/S1872-2067(10)60267-7

• 研究论文 • 上一篇    下一篇

Effects of Selected Promoters on Ni/γ-Al2O3 Catalyst Performance in Methane Dry Reforming

Ahmed S. A. AL-FATESH, Anis H. FAKEEHA, Ahmed E. ABASAEED*   

  1. Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 1142, Saudi Arabia
  • 收稿日期:2011-06-07 修回日期:2011-08-16 出版日期:2011-09-30 发布日期:2015-02-12

Effects of Selected Promoters on Ni/γ-Al2O3 Catalyst Performance in Methane Dry Reforming

Ahmed S. A. AL-FATESH, Anis H. FAKEEHA, Ahmed E. ABASAEED*   

  1. Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 1142, Saudi Arabia
  • Received:2011-06-07 Revised:2011-08-16 Online:2011-09-30 Published:2015-02-12

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摘要： The Ni catalysts supported on γ-Al2O3 were synthesized by an impregnation method. Their catalytic performance in methane dry reforming was investigated. The reforming reactions were carried out in a microreactor using a CO2:CH4 feed ratio of 1:1, a F/W = 2640 ml/(h·g), reaction temperatures between 500–850 °C, and at atmospheric pressure. The influence of Ca, Ce, and Zr promoters on catalyst stability, coke deposition, and the H2/CO ratio were also studied. Effluents were analyzed using an online gas chromatograph equipped with a thermal conductivity detector. The spent and fresh catalysts were characterized by scanning electron microscopy and thermogravimetric analysis. It was found that 3%Ni/γ-Al2O3 promoted with 0.15% Ce and 0.05% Ca gave the best performance and resulted in less coke formation. The highest CH4 and CO2 conversion activities were found to be 94.1% and 98.3% at 850 °C, respectively. Stability tests were carried out for 130 h and this provided a H2 yield of 91%. Moreover, the amount of formed carbon was negligible and did not increase to more than 1.5 wt%.

关键词: methane, dry reforming, coke, nickel, synthesis gas, stability

Abstract: The Ni catalysts supported on γ-Al2O3 were synthesized by an impregnation method. Their catalytic performance in methane dry reforming was investigated. The reforming reactions were carried out in a microreactor using a CO2:CH4 feed ratio of 1:1, a F/W = 2640 ml/(h·g), reaction temperatures between 500–850 °C, and at atmospheric pressure. The influence of Ca, Ce, and Zr promoters on catalyst stability, coke deposition, and the H2/CO ratio were also studied. Effluents were analyzed using an online gas chromatograph equipped with a thermal conductivity detector. The spent and fresh catalysts were characterized by scanning electron microscopy and thermogravimetric analysis. It was found that 3%Ni/γ-Al2O3 promoted with 0.15% Ce and 0.05% Ca gave the best performance and resulted in less coke formation. The highest CH4 and CO2 conversion activities were found to be 94.1% and 98.3% at 850 °C, respectively. Stability tests were carried out for 130 h and this provided a H2 yield of 91%. Moreover, the amount of formed carbon was negligible and did not increase to more than 1.5 wt%.

Key words: methane, dry reforming, coke, nickel, synthesis gas, stability