Development of porous nickel catalysts by low-temperature Ni?Al chemical alloying and post selective Al leaching, and their application for ammonia decomposition

Title
Development of porous nickel catalysts by low-temperature Ni?Al chemical alloying and post selective Al leaching, and their application for ammonia decomposition
Authors
남석우김용민윤창원정향수손현태조영석이용석차준영이유진김광범
Issue Date
2020-07
Publisher
International journal of hydrogen energy
Citation
VOL 45, NO 38-19191
Abstract
Micron-sized Ni– Al alloy powders (Ni– x wt.%Al, x = 40, 50, 60) were synthesized using the low-temperature chemical alloying (LTCA) at 500 °C. The three different as-prepared Ni– Al alloy powders were composed of Ni2Al3 and/or NiAl3 phases while achieving thermodynamic equilibrium compositions (Ni– 40 wt%Al, Ni2Al3; Ni– 50 wt%Al, the coexistence of Ni2Al3 and NiAl3; 60 wt%Al, NiAl3). The LTCA method demonstrates that it is capable of producing Al-rich Ni– Al alloy powders while maintaining a particle size similar to that of the starting Ni particles. The three Ni– Al alloy powders were used as precursor materials to fabricate porous nickel catalysts through a selective aluminum leaching process, followed by the enlargement of the surface area. Alteration of the material characteristics with respect to the leaching time was investigated using XRD, FESEM-EDS, TEM, XPS, TPR, BET, and particle size analysis. The nickel skeletal catalysts with the increased BET-surface areas (50– 111 m2/g) displayed high reactivity toward ammonia decomposition.
URI
http://pubs.kist.re.kr/handle/201004/71484
ISSN
0360-3199
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