Development of porous nickel catalysts by low-temperature Ni？Al chemical alloying and post selective Al leaching, and their application for ammonia decomposition
- Development of porous nickel catalysts by low-temperature Ni？Al chemical alloying and post selective Al leaching, and their application for ammonia decomposition
- 남석우; 김용민; 윤창원; 정향수; 손현태; 조영석; 이용석; 차준영; 이유진; 김광범
- Issue Date
- International journal of hydrogen energy
- VOL 45, NO 38-19191
- 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.
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