Hydrogen storage material and related processes
Disclosed herein is a composition comprising a complex hydride and a borohydride catalyst wherein the borohydride catalyst comprises a BH 4 group, and a group IV metal, a group V metal, or a combination of a group IV and a group V metal. Also disclosed herein are methods of making the composition.
1. A hydrogen storage composition consisting essentially of a complex hydride and a borohydride catalyst,
wherein the borohydride catalyst comprises a BH 4 group and a metal selected from the group consisting of titanium, zirconium and combinations thereof, and
wherein the complex hydride includes a metal borohydride compound selected from the group consisting of borohydride salts (M(BH 4 ) n ), triborohydride salts (M(B 3 H 8 ) n ), decahydrodecaborate salts (M 2 (B 10 H 10 ) n ), tridecahydrodecaborate salts (M(B 10 H 13 ) n ), dodecahydrododecaborate salts (M 2 (B 12 H 12 ) n ), and octadecahydroicosaborate salts (M 2 (B 20 H 18 ) n ), where M is a cation selected from the group consisting of alkali metal cations, alkaline earth metal cations, aluminum cation, zinc cation, and ammonium cation, and n is equal to the charge of the cation; and
wherein the borohydride catalyst further comprises a cyclopentadienyl group, a halide, or combinations thereof.
2. The composition of claim 1 , wherein the complex hydride is present in an amount of about 75 to about 99 weight percent, and the borohydride catalyst is present in an amount of about 1 to about 25 weight percent, wherein the weight percents are based on the combined weight of the complex hydride and the borohydride catalyst.
3. The composition of claim 1 , wherein the complex hydride comprises Mg(BH 4 ) 2 .
4. The composition of claim 1 , wherein the borohydride catalyst comprises bis(cyclopentadienyl) titanium borohydride.
5. The composition of claim 1 , wherein the borohydride catalyst comprises CpTi(BH 4 ) 2-x Cl x , where x=0, 1; and wherein Cp is at least one cyclopentadienyl group.
6. The composition of claim 1 , wherein the complex hydride comprises Li(BH 4 ) or Ca(BH 4 ) 2 .