Abstract
Hydrogen production via steam reforming of a simulated biogas was achieved in a temperature range of 500–800 °C over a plate-type Ni–Al catalyst. To enhance the catalytic activity of the Ni–Al catalyst, a pretreatment process involving pre-oxidation with sequential reduction was employed prior to the reforming reactions. The activated Ni–Al catalyst exhibited increased methane conversion depending on the pre-oxidation temperature. Studies using X-ray diffraction and scanning electron microscopy suggested that the catalyst surface was restructured upon pretreatment, ultimately improving the catalytic activity. To increase its catalytic stability, CeO2 was employed additionally as a structural promoter to prevent both Ni sintering and carbon deposition. The durability of the CeO2-coated Ni–Al catalyst was improved significantly, particularly upon addition of ≥2.8 wt% of CeO2, with ca. 75 % of CH4 conversions being achieved without deactivation over 100 h at 700 °C. The influence of the pre-oxidation temperature, reforming temperature, and steam/CH4 ratio on reforming over a CeO2–Ni–Al catalyst was also elucidated. In addition, the potential roles of CeO2 in the enhancement of activity and stability were discussed.
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Acknowledgments
This research was supported by the Global Research Laboratory (GRL) Program through the National Research Foundation of Korea funded by the Ministry of Science, ICT and Future Planning of Republic of Korea. A part of this research was also supported by the Fundamental Technology Development Programs for the Future through the Korea Institute of Science and Technology as well as by the National Research Foundation of Korea Grant funded by the Korean Government (MSIP) (University-Institute cooperation program).
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Bui, Q.T.P., Kim, Y., Nguyen, H.T.B. et al. Steam Reforming of Biogas over CeO2-Coated Ni–Al Plate Catalysts. Catal Lett 145, 1403–1412 (2015). https://doi.org/10.1007/s10562-015-1532-5
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DOI: https://doi.org/10.1007/s10562-015-1532-5