Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 472, Issue 1-2, Pages 71-78Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2008.04.017
Keywords
Metals; Liquid quenching; Chemical synthesis; Scanning electron microscopy; X-ray diffraction
Categories
Funding
- National Natural Science Foundation of China [50701028]
- Excellent Middle-age and Young Scientists Research Award Foundation of Shandong Province [2007BS04024]
- Ruhr University Bochum (Bochum, Germany)
- DFG-SFB 459
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In this paper, the effect of alloy composition on the formation of porous Ni catalysts prepared by chemical dealloying of rapidly solidified Al-Ni alloys has been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis and N-2 adsorption experiments. The experimental results show that rapid solidification and alloy composition have a significant effect on the phase constituent and microstructure of Al-Ni alloys. The melt spun Al-20 at.% Ni alloy consists of alpha-Al, NiAl3 and Ni2Al3, while the melt spun Al-25 and 31.5 at.% Ni alloys comprise NiAl3 and Ni2Al3. Moreover, the formation and microstructure of the porous Ni catalysts are dependent upon the composition of the melt spun Al-Ni alloys. The morphology and size of Ni particles in the Ni catalysts inherit from those of grains in the melt spun Al-Ni alloys. Rapid solidification can extend the alloy composition of Al-Ni alloys suitable for preparation of the Ni catalysts, and obviously accelerate the dealloying process of the Al-Ni alloys. (C) 2008 Elsevier B.V. All rights reserved.
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