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; Ni–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.
|Number of pages||11|
|Journal||International Journal of Hydrogen Energy|
|Publication status||Published - 2020 Jul 31|
Bibliographical noteFunding Information:
This work was supported by the KIST Institutional Programs (No. 2E29900 ) and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20183010042020 ).
© 2020 Hydrogen Energy Publications LLC
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology