COMPOSITIONS COMPRISING MAGNESIUM BOROHYDRIDE AND MAGNESIUM HYDRIDOBOROHYDRIDE AND METHOD FOR MANUFACTURING THE SAME
Disclosed herein is a method comprising reacting a metal borohydride with a metal chloride composition in a solvent to form a reaction mixture, wherein the metal chloride composition comprises magnesium chloride; wherein the metal borohydride and the metal chloride composition are insoluble in the solvent; grinding the reaction mixture to produce a composition that comprises magnesium hydridoborohydride; and removing the solvent from the composition. Disclosed herein too is a composition comprising magnesium hydridoborohydride having the formula Mg n H(BH 4 ) 2n-1 where n is about 3 to about 7. Disclosed herein too is a method of manufacturing hydrogen comprising heating a composition comprising magnesium hydridoborohydride.
1 . A composition comprising:
magnesium hydridoborohydride having the formula Mg n H(BH 4 ) 2n-1 where n is about 3 to about 7.
2 . The composition of claim 1 , wherein n is about 3 to about 4.
3 . The composition of claim 1 , further comprising magnesium borohydride.
4 . A method comprising:
reacting a metal borohydride with a metal chloride composition in a solvent to form a reaction mixture, wherein the metal chloride composition comprises magnesium chloride; wherein both the metal borohydride and the metal chloride composition are insoluble in the solvent;
grinding the reaction mixture to produce a composition that comprises magnesium hydridoborohydride; and
removing the solvent from the composition.
5 . The method of claim 4 , further comprising separating the magnesium hydridoborohydride from insoluble reactants and reaction products.
6 . The method of claim 4 , wherein the grinding is conducted using ball milling, milling in a Wiley mill, hammer milling, rod milling, semi autogenous milling, autogenous milling, pebble milling, milling using high pressure grinding rolls, milling in a Buhrstone mill, or a combination comprising at least one of the foregoing grinding operations.
7 . The method of claim 4 , wherein the ball milling is conducted a rolling ball mill or in a planetary ball mills.
8 . The method of claim 4 , wherein the removing of the solvent is conducted in a vacuum.
9 . The method of claim 4 , wherein the metal borohydride is sodium borohydride, potassium borohydride, calcium borohydride, or a combination comprising at least one of the foregoing metal borohydrides.
10 . The method of claim 4 , wherein the metal chloride composition comprises a metal chloride in addition to the magnesium chloride.
11 . The method of claim 4 , wherein a molar ratio of a borohydride (BH 4 ) group in the metal borohydride to magnesium chloride in the metal chloride composition is about 2:1 to about 6:1.
12 . The method of claim 4 , wherein a molar ratio of a borohydride (BH 4 ) group in the metal borohydride to magnesium chloride in the metal chloride composition is about 2:1 to about 3:1.
13 . The method of claim 4 , wherein a molar ratio of the solvent to the sum of the metal borohydride and the metal chloride composition is about 50:1 to about 100:1.
14 . The method of claim 4 , wherein the solvent is an alkyl ether.
15 . The method of claim 14 , wherein the alkyl ether is methyl ether, ethyl ether, propyl ether, or a combination comprising at least one of the foregoing alkyl ethers.
16 . The method of claim 4 , wherein the solvent is an alkyl amine.
17 . The method of claim 4 , wherein removing the solvent is conducted via evaporation in vacuum.
18 . A method of manufacturing hydrogen comprising:
heating a composition comprising magnesium hydridoborohydride.
19 . The method of claim 18 , wherein the heating is conducted to a temperature of greater than or equal to about 395° C.
20 . The method of claim 18 , wherein the hydrogen is released in an amount of about 12.4 to about 14.8 wt %, based on a total weight of the composition.
21 . The method of claim 18 , wherein the composition further comprises magnesium borohydride.