Fabrication of a regenerable Ni supported NiO-MgO catalyst for methane steam reforming by exsolution

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Nickel nanoparticles supported on a NiO-MgO solid solution are fabricated using the exsolution process. Upon reduction, the nickel nanoparticles are exsoluted from a Ni0.4Mg0.6O solid solution powder. From the results obtained from transition electron microscopy (TEM) and temperature programmed reduction (TPR) measurements, it is concluded that the size and dispersion state of the nickel nanoparticles strongly depend on the homogeneity of the parent solid solution. Sintering the parent solid solution powder at a high temperature results in a homogeneous solid solution, which leads to a decreased reducibility of the nickel ions and, consequently, well-distributed Ni nanoparticles are successfully obtained. The metallic nickel moves reversibly to and out of the parent solid solution in response to a specific atmospheric condition. The methane steam reforming over the as-synthesized nickel nanoparticles are evaluated and appreciable degradation (1000 h) of the catalytic activity is not found for the catalyst sample that is sintered at 1000 degrees C followed by subsequent reduction to 800 degrees C.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2018-09
Language
English
Article Type
Article
Keywords

OXIDE FUEL-CELLS; AUTOMOTIVE EMISSIONS CONTROL; HYDROGEN; PD

Citation

JOURNAL OF POWER SOURCES, v.397, pp.318 - 324

ISSN
0378-7753
DOI
10.1016/j.jpowsour.2018.07.025
URI
http://hdl.handle.net/10203/246215
Appears in Collection
EEW-Journal Papers(저널논문)
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