Lee, Yu-Jin Lee, Yong-Seok Cha, Jun Young Jo, Young Suk Jeong, Hyangsoo Sohn, Hyuntae Yoon, Chang Won Kim, Yongmin Kim, Kwang-Bum Nam, Suk Woo 2024-01-19T17:02:38Z 2024-01-19T17:02:38Z 2021-09-05 2020-07-31 0360-3199 https://pubs.kist.re.kr/handle/201004/118350 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 degrees 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 m(2)/g) displayed high reactivity toward ammonia decomposition. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD COX-FREE HYDROGEN RANEY-NICKEL PARTICLE-SIZE PHASE MICROSTRUCTURE NI/AL2O3 NIAL3 Development of porous nickel catalysts by low-temperature Ni-Al chemical alloying and post selective Al leaching, and their application for ammonia decomposition Article 10.1016/j.ijhydene.2020.05.025 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.45, no.38, pp.19181 - 19191 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 45 38 19181 19191 scie scopus 000552053500036 2-s2.0-85086019137 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article COX-FREE HYDROGEN RANEY-NICKEL PARTICLE-SIZE PHASE MICROSTRUCTURE NI/AL2O3 NIAL3 Ni-Al alloy Powder Low-temperature chemical alloying (LTCA) Aluminum selective leaching Ammonia decomposition Hydrogen production Raney nickel