Steam Reforming of Biogas over CeO2-Coated Ni-Al Plate Catalysts

Authors
Quynh Thi Phuong BuiKim, YongminHien Thi Bich NguyenNam, Suk WooHan, Jong HeeHam, Hyung ChulKim, Jin YoungChoi, Sun HeeHong, Sung-AnYoon, Chang Won
Issue Date
2015-07
Publisher
SPRINGER
Citation
CATALYSIS LETTERS, v.145, no.7, pp.1403 - 1412
Abstract
Hydrogen production via steam reforming of a simulated biogas was achieved in a temperature range of 500-800 A degrees 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 a parts per thousand yen2.8 wt% of CeO2, with ca. 75 % of CH4 conversions being achieved without deactivation over 100 h at 700 A degrees 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. [GRAPHICS] .
Keywords
HYDROGEN-PRODUCTION; FUEL-CELLS; METHANE; OXIDE; SURFACES; HYDROGEN-PRODUCTION; FUEL-CELLS; METHANE; OXIDE; SURFACES; Heterogeneous catalysis; Green chemistry; Fuel cell; CO2; Reforming; Biogas
ISSN
1011-372X
URI
https://pubs.kist.re.kr/handle/201004/125310
DOI
10.1007/s10562-015-1532-5
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KIST Article > 2015
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