Abstract—Catalytic effect of Al(OH)
3 on the hydrogen generation from Al/water system is evaluated. The Al(OH)
3 powders are synthesized from various molar ratios of Al(NO
3)
3 : NaOH = 1:3 ~ 1:5. It was found that the Al(OH)
3 catalyst derived from the ratio Al(NO
3)
3 : NaOH = 1:3.5~1:4 in an ice bath exhibits the best catalytic effect and exerts the highest hydrogen generation rate. Over 95% yield of hydrogen from a 3 g Al/50 ml water system (with 15 g Al(OH)3 and pH=12) can be generated within 100 s. That is, by using specially synthesized Al(OH)
3 catalyst at a Al:Al(OH)
3:H
2O=3:15:50 weight ratio, very rapid hydrogen generation rate (~667 ml/g·Al·min), without using any alloying elements or extreme corrosive condition, can be realized.
Index Terms—Aluminum hydroxide, aluminum nitrate, hydrogen generation.
The authors are with the Department of Chemistry, Chung-Yuan Christian University, Chung-Li, 320, Taiwan, R.O.C. (corresponding author: H. W. Wang; e-mail: hongwen@cycu.edu.tw).
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Cite: Hong-Wen Wang and Ming-Ssu Chin, "Rapid Hydrogen Generation from Aluminum-Water System Using Synthesized Aluminum Hydroxide Catalyst," International Journal of Chemical Engineering and Applications vol. 6, no. 3, pp. 146-151, 2015.
