Fluorinated metal hydrides for the catalytic hydrolysis of metal-hydrogen complexes

Abstract

This paper is related to the hydrogen storage (H-storage) system composed of an alkaline solution that contains metal-hydrogen complex ions. The BH 4 − -complex ions stabilized when it is dissolved in aqueous KOH or NaOH to form homogeneous solutions. However, it is necessary to apply an appropriate catalyst for a high rate generation of hydrogen under atmospheric pressure and temperature conditions. The authors intended to develop catalysts suitable for the hydrolysis of BH 4 --complex ion solutions and found that Mg 2 Ni exhibits excellent catalytic functions in the hydrolysis, in particular, after the fluorination treatment (F-treatment). In this work, the effects of F-treatment on the rates of hydrolysis were evaluated between the hydrided and unhydrided Mg 2 Ni. No hydrogenation in addition to F-treatment is required in view of hydrolysis kinetics and cost-effectiveness.

Production of sodium borohydride by using dynamic behaviors of protide at the extreme surface of magnesium particles

“…Cathode: [17][18][19][20][21][22] Gaseous hydrogen, H 2 , is generated by the catalytic hydrolysis of borohydride;…”

Hydrogen generation by hydrolysis reaction of lithium borohydride

“…The best value of hydrogen adsorption in carbon materials has been 5:1 wt% at a temperature of 77 K [4]. The hydrolysis reaction of NaH produces hydrogen of 4 wt% [19]. The hydrogen yield of LiH upon addition of stoichiometric amounts of water is 34% [16].…”

“…LiH is prepared as a slurry with light mineral oil and the dispersion has been found to be stable for long periods of time at normal temperature and pressure [11]. NaBH4 is stable compared to other chemical hydride and is easy to handle [13][14][15][16][17][18][19][20][21]. At room temperatures, only a small percentage of the theoretical amount of H2 is liberated by hydrolysis reaction of NaBH4 and H2O [22], but the hydrolysis is accelerated by the use of catalysts [13][14][15][16][19][20][21][22].…”

“…Among these methods, attention has recently been given to the hydrolysis of chemical hydride (ionic hydride) such as NaH [10], LiH [11] and NaBH4 [13][14][15][16][17][18][19][20][21]. PowerBall Technologies and Thermo Technologies proposed NaH and LiH, respectively [10,11].…”

“…Hydrogen can be stored in tanks of compressed [2,3] or liqueÿed H2 [3], or by adsorption on activated carbon [4], carbon nanotubes [3,5,6] and graphite nanoÿber [7,8] or in a hydrogen-absorbing alloy [9] or a chemical hydride such as NaH [10], LiH [11], NaAlH4 [12] or NaBH4 [13][14][15][16][17][18][19][20][21].…”