Orthogonal Experiment Study on the Hydrogen Desorption Properties of NaAlH₄ and LiAlH₄

Abstract:

Orthogonal experiment design and variance analysis were adopted to investigate the hydrogen desorption properties of NaAlH₄ and LiAlH₄, which consisted of three stages, ball-milled under argon. Optimum milling condition was very important for the performance of NaAlH₄ and LiAlH₄, which was obtained from the orthogonal experiments. The orthogonal experiment design considered three experimental factors, i.e. weight ratio of ball to power, weight ratio of ɸ8 ball to ɸ4 ball and milling time, which varied on three different levels, respectively. According to the range analysis and variance analysis from the orthogonal experiments, the weight ratio of ball to powder and ɸ8 ball to ɸ4 ball had more impacts on the hydrogen desorption time of NaAlH₄,while the most sensitive influencing factor of LiAlH₄ was milling time. NaAlH₄ had the optimum performance when the weight ratio of ball to power was 30:1, the weight ratio of ɸ8 ball to ɸ4 ball was 0.5:1 and milling time was 0.5h. LiAlH₄ had the optimum performance when the weight ratio of ball to power was 40:1, the weight ratio of ɸ8 ball to ɸ4 ball was 0.5:1 and milling time was 2h.

• Periodical: Advanced Materials Research (Volume 413)
• Pages: 491-498
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.413.491
• Online since: December 2011
• Authors: Xue Ping Zheng, Xin Feng, Xiao Bin Lin, Sheng Lin Liu
• Keywords: Ball-milling, Hydrogen Desorption, NaAlH₄, Orthogonal Experiment

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