Lewis Base Complexes of Magnesium Borohydride: Enhanced Kinetics and Product Selectivity upon Hydrogen Release

Abstract

Tetrahydofuran (THF) complexed to magnesium borohydride has been found to have a positive effect on both the reactivity and selectivity, enabling release of H 2 at <200 • C and forms Mg(B 10 H 10 ) with high selectivity.

A Precious Catalyst: Rhodium‐Catalyzed Formic Acid Dehydrogenation in Water

“…Besides using physical principles to store hydrogen, chemical approaches are a viable alternative. Some solutions propose the reversible hydrogenation of aromatic systems, also hydrogen‐rich compounds such as boron hydrides could serve as hydrogen storage media . Another promising approach is to bind hydrogen reversibly to a cheap and abundant carrier molecule to obtain liquid organic hydrogen carriers (LOHC) .…”

Properties and Applications of Metal (M) dodecahydro-closo-dodecaborates (Mn=1,2B12H12) and Their Implications for Reversible Hydrogen Storage in the Borohydrides

“…All three anions have been theoretically predicted as potential intermediate compounds in the desorption schemes of the most commonly investigated borohydrides (MBH 4 , M = Li [34], Mg and Na [58] [110]. Coordination of Mg(BH 4 ) 2 with a THF adduct has also been found to result in the preferential formation of MgB 10 H 10 as a product of desorption at 180 • C [111]. However, these observations for the Mg(BH 4 ) 2 -THF system are anomalous, as the [B 12 H 12 ] 2− dianion has been recognised as the most energetically favourable and thermodynamically stable of the proposed polyborane intermediates.…”

Hydrogen absorption/desorption properties of light metal hydroxide systems

“…The characterization of absorption/desorption products and the kinetics enhancement by additive has been the subject matter of investigations. [3][4][5] A representative example of M-N-H systems is lithium-nitrogen-hydrogen (Li-N-H) system. Li-N-H system has been reported a lot so far 6,7 ; however, this system has high value of enthalpy change and desorbs hydrogen at high temperature of around 300 C. By contrast, Li-Mg-N-H system has some merits of having low value of enthalpy change and lower temperature of around 180 C for hydrogen absorption/ desorption.…”

“…For instance, metal borohydrides have high gravimetric and volumetric densities of H 2 . The characterization of absorption/desorption products and the kinetics enhancement by additive has been the subject matter of investigations . A representative example of M‐N‐H systems is lithium‐nitrogen‐hydrogen (Li‐N‐H) system.…”