Kinetics and mechanism of MgH2 hydrolysis in MgCl2 solutions

Effect of Metaborate Additive Modification on Hydrolysis Performance of MgH2

“…The hydrogen production rate and yield are slightly lower than those of some MgH 2 hydrolysis using both strategies combined: chloride or sulfate solutions with nanostructuring or introducing catalysts (Table ). ,− Herein, the results prove that in situ -formed NaBH 4 can significantly promote the hydrolysis of MgH 2 . In addition, the amount of NaBO 2 plays an important role in the hydrolysis of MgH 2 .…”

Uniform dispersion of ultrafine ruthenium nanoparticles on nano-cube ceria as efficient catalysts for hydrogen production from ammonia-borane hydrolysis

“…[7][8][9][10] Therefore, there is a crying necessity to develop a safe and effective technology for producing/storing hydrogen, especially for hydrogen-oxygen fuel cells with higher energy density to power portable tools and equipment. Some solid hydrogen storage materials can react with water to produce hydrogen at room temperature, [11][12][13] which is a convenient, economical, efficient, and feasible way to supply hydrogen to small hydrogen-oxygen fuel cell systems. Ammonia-borane (NH 3 BH 3 , AB) is one of the most important chemical hydrides due to its high hydrogen capacity (19.6 wt%), non-toxicity, excellent solubility in water, and superior solid phase stability at room temperature.…”

Geometric Optimization of Hydrolysis Reactors to Enhance MgH2 Hydrolysis Performance

“…At present, the hydrogen storage methods mainly include liquid hydrogen, compressed hydrogen, solid hydrogen storage, and so forth. , Liquid hydrogen has the advantages of high purity and a high hydrogen storage density, which looks feasible, but the compression process requires 20 K at atmospheric or higher pressure, which can increase its cost. , Compressed hydrogen is easier and cheaper to be used than liquid hydrogen . However, compressed hydrogen requires the use of a high-pressure gas storage tank when achieving a high hydrogen storage density, which further increases its safety risk. ,− Compared with liquid hydrogen and compressed hydrogen, solid hydrogen storage has good stability and hydrogen storage density, which is more suitable for convenient and safe transportation. , This method has received more and more attention in recent years.…”

“…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%. The above research studies greatly improve the MgH 2 hydrolysis kinetics and are helpful for our research.…”

“…13 However, compressed hydrogen requires the use of a high-pressure gas storage tank when achieving a high hydrogen storage density, which further increases its safety risk. 10,14−17 Compared with liquid hydrogen and compressed hydrogen, solid hydrogen storage has good stability and hydrogen storage density, 18 which is more suitable for convenient and safe transportation. 19,20 This method has received more and more attention in recent years.…”