Comparison of Hydrogen Yield from Ball-Milled and Unmilled Magnesium Hydride in a Batch System Hydrogen Reactor

Geometric Optimization of Hydrolysis Reactors to Enhance MgH2 Hydrolysis Performance

“…In view of this, many methods have been proposed to improve the hydrolysis kinetics. For example, (1) reducing the particle size by ball milling. − Here, ball milling can effectively reduce the crystallite size and increase the reaction surface area, which can improve hydrolysis performance. , Xie et al report that the hydrolysis conversion of MgH 2 –Nb 2 O 5 increased from 43.1 to 73.6% and the crystallite size decreased from 40 to 10 μm by ball milling for 3 h; (2) adding additives and compounding with MgH 2 . − Zhou et al prepared MgH 2 –10 wt % CoCl 2 by milling, and the conversion increased from 5.7 to 91.7%. Ma et al reported that the hydrolysis conversion of MgH 2 –LiNH 2 was 61.2% higher than that of pure MgH 2 ; (3) changing the composition of the hydrolysis solution. − Yuan et al increased the hydrogen production rate of MgH 2 from 94.0 to 1664 mL/g by adding Fe 2 (SO 4 ) 3 into the hydrolysis solution; Markman et al used acetic acid solution as the hydrolysis solution to increase the MgH 2 conversion from 13 to over 80%.…”

“…35−38 Here, ball milling can effectively reduce the crystallite size and increase the reaction surface area, which can improve hydrolysis performance. 39,40 Xie et al 35 report that the hydrolysis conversion of MgH 2 − Nb 2 O 5 increased from 43.1 to 73.6% and the crystallite size decreased from 40 to 10 μm by ball milling for 3 h; (2) adding additives and compounding with MgH 2 . 41−43 Zhou et al 44 prepared MgH 2 −10 wt % CoCl 2 by milling, and the conversion increased from 5.7 to 91.7%.…”