Process for synthesizing metal borohydrides

Abstract

A process for synthesizing metal borohydride especially sodium borohydride directly from borax by the use of proton H at room temperature and pressure. Said process comprising the steps of: Providing proton H by the use of metals or alloys that can form hydrides with hydrogen. In this case, the metals or alloys are the carriers of proton H Proton H also can be provided from hydrogen gas by the use of catalysts located on the surface of carriers. Making the proton H enters the lattice of boron oxides Removing the oxygen from the lattice of boron oxides by the use of the carriers.

1 . A process for synthesizing metal borohydride alkali solutions which comprises:
 synthesizing a carrier powder;   bonding hydrogen to said carrier powder;   producing metal borohydride powder from said carrier powder;   treating said metal borohydride powder with an alkali solution to produce a metal borohydride alkali solution.   
   
   
       2 . The process according to  claim 1  wherein synthesizing a carrier powder comprises:
 forming a mixture including a metal that is capable of forming hydrides with hydrogen and a hydrogen storage alloy;   mechanically pulverizing said mixture;   mechanically mixing the resulting pulverized mixture with an alkali compound; and   subjecting the resulting mixture to water vapor at less than one atmosphere to produce a carrier powder.   
   
   
       3 . The process according to  claim 1  wherein synthesizing a carrier powder comprises:
 forming a mixture of a first metal with a carbon black coated with a second metal selected from the group consisting of platinum, palladium and mixtures and alloys thereof; and   mechanically pulverizing said mixture.   
   
   
       4 . The process according to  claim 1  wherein bonding hydrogen to said carrier powder comprises subjecting said carrier powder to hydrogen gas at a temperature from ambient to 400° C. so that hydrogen is carried by said carrier powder. 
   
   
       5 . The process according to  claim 1  wherein producing a metal borohydride powder from said carrier powder comprises mixing a quantity of said carrier powder with a non-aqueous metal boron oxide or borax and pulverizing the resulting mixture under hydrogen gas so that a metal borohydride powder is produced. 
   
   
       6 . The process according to  claim 1  wherein treating of said metal borohydride powder with an alkali solution comprises adding said metal borohydride powder to an alkali solution; and
 filtering out precipitates, leaving metal borohydride alkali solution.   
   
   
       7 . A process for synthesizing substantially pure metal borohydrides which comprises:
 synthesizing a carrier powder;   bonding hydrogen to said carrier powder;   producing a metal borohydride powder from said carrier powder;   dissolving said metal borohydride powder with a solvent;   filtering precipitates; and   evaporating said solvent to leave substantially pure metal borohydride.   
   
   
       8 . The process according to  claim 7  wherein synthesizing a carrier powder comprises:
 forming a mixture including a metal that is capable of forming hydrides with hydrogen and a hydrogen storage alloy;   mechanically pulverizing said mixture;   mechanically mixing the resulting pulverized mixture with an alkali compound; and   subjecting the resulting mixture to water vapor at less than one atmosphere to produce a carrier powder.   
   
   
       9 . The process according to  claim 7  wherein synthesizing a carrier powder comprises:
 forming a mixture of a first metal with a carbon black coated with a second metal selected from the group consisting of platinum, palladium and mixtures and alloys thereof; and   mechanically pulverizing said mixture.   
   
   
       10 . The process according to  claim 7  wherein bonding hydrogen to said carrier powder comprises subjecting said carrier powder to hydrogen gas at a temperature from ambient to 400° C. so that hydrogen is carried by said carrier powder. 
   
   
       11 . The process according to  claim 7  wherein producing a metal borohydride powder from said carrier comprises mixing a quantity of said carrier powder with a non-aqueous metal boron oxide or borax and pulverizing the resulting mixture under hydrogen gas so that a metal borohydride powder is produced. 
   
   
       12 . The process according to  claim 7  including forming a substantially pure metal borohydride by dissolving said metal borohydride powder into a liquid that can dissolve metal borohydrides;
 filtering the resulting solution; and   evaporating the resulting liquid to obtain substantially pure metal borohydride.   
   
   
       13 . A process of synthesizing metal borohydrides which comprises:
 forming a mixture including a metal that is capable of forming hydrides with hydrogen and a hydrogen storage alloy;   mechanically pulverizing said mixture;   mechanically mixing the resulting pulverized mixture with an alkali compound;   subjecting the resulting mixture to water vapor at less than one atmosphere to produce a carrier powder;   subjecting said carrier powder to hydrogen gas at a temperature from ambient to 400° C. so that hydrogen is carried by said carrier powder;   mixing a quantity of said carrier powder with metal boron oxide or borax and pulverizing the resulting mixture under hydrogen gas so that a metal borohydride powder is produced;   adding said metal borohydride powder to an alkali solution; and   filtering out precipitates, leaving a metal borohydride alkali solution.   
   
   
       14 . A process of synthesizing substantially pure metal borohydride which comprises:
 forming a mixture including a metal that is capable of forming hydrides with hydrogen and a hydrogen storage alloy;   mechanically pulverizing said mixture;   mechanically mixing the resulting pulverized mixture with an alkali compound;   subjecting the resulting mixture to water vapor at less than one atmosphere to produce a carrier powder;   subjecting said carrier powder to hydrogen gas at a temperature from ambient to 400° C. so that hydrogen is carried by said carrier powder;   mixing a quantity of said carrier powder with boron oxide or borax and pulverizing the resulting mixture under hydrogen gas so that a metal borohydride powder is produced;   dissolving said metal borohydride powder into a liquid that can dissolve metal borohydrides;   filtering the resulting solution; and   evaporating said liquid to obtain substantially pure metal borohydride.