Characterization and activity of K, CeO2, and mn promoted Ni/Al2O3 catalysts for carbon dioxide reforming of methane
Characterization and activity of K, CeO2, and mn promoted Ni/Al2O3 catalysts for carbon dioxide reforming of methane
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DOI：
10.1021/ie060661q
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发表时间：
2006-09
影响因子：
4.2
通讯作者：
Nandini A. Pechimuthu;K. Pant;S. C. Dhingra;R. Bhalla
中科院分区：
文献类型：
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作者：
Nandini A. Pechimuthu;K. Pant;S. C. Dhingra;R. Bhalla
研究了在钾、MnO和CeO₂改性的Ni/γ - Al₂O₃催化剂上甲烷与二氧化碳重整制合成气的反应。催化剂采用浸渍法制备，并通过BET比表面积、孔容、X射线衍射、扫描电子显微镜、透射电子显微镜、程序升温研究和脉冲化学吸附等方法进行了表征。通过在固定床反应器中进行重整反应来评估这些催化剂的性能。研究结果表明，通过添加钾以及CeO₂（或MnO）作为助剂，可以制备出用于甲烷二氧化碳重整的稳定的Ni/Al₂O₃催化剂。利用各种表征技术的结果将观察到的催化活性和稳定性与催化剂性能相关联。助剂催化剂的稳定性以及较低的积炭量归因于助剂斑块对镍表面的部分覆盖、金属 - 载体强相互作用（TPR……
Reforming of methane with carbon dioxide into syngas over Ni/γ-Al2O3 catalysts modified by potassium, MnO, and CeO2 was studied. The catalysts were prepared by impregnation technique and were characterized by BET surface area, pore volume, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, temperature-programmed studies, and pulse chemisorption. The performance of these catalysts was evaluated by conducting the reforming reaction in a fixed-bed reactor. Results of the investigation suggested that stable Ni/Al2O3 catalysts for the carbon dioxide reforming of methane can be prepared by the addition of both potassium and CeO2 (or MnO) as promoters. The results of the various characterization techniques were used to relate the observed catalytic activity and stability to the catalyst property. The stability and lower amounts of coking on promoted catalysts were attributed to partial coverage of the surface of nickel by patches of promoters, strong metal−support interaction (TPR...