Method for production of power from aluminum
View Patent ↗Aluminum is treated with an agent to prevent passivation of the aluminum during oxidation. The passivation preventing agent is a metal alloy containing gallium, preferably a eutectic alloy of gallium, indium and tin. The surface of the metallic aluminum is wetted with the eutectic alloy, suitably by scouring and/or immersion. The treated aluminum may be mixed with water, hydrogen peroxide or other suitable oxidizer in a controlled manner to produce hydrogen, heat, steam or oxygen for the use in power generation or chemical reactions. The passivation removal agent can be used in small quantities and is readily recoverable following the reaction.
1. A method of production of hydrogen, said method comprising the steps of:
providing an aluminum material;
applying to said aluminum material an eutectic alloy containing gallium in an amount effective to prevent passivation of said aluminum material;
reacting said aluminum material to which said eutectic alloy has been applied with a hydrogen-containing oxidant so as to generate hydrogen and heat; and
recovering aluminum oxide and at least a portion of said eutectic alloy following reaction of said aluminum material with said oxidant, the step of recovering at least a portion of said eutectic alloy comprising:
mixing a base with products of the reaction so as to precipitate said portion of said eutectic alloy from a suspension of said aluminum oxide.
2. A method of production of hydrogen, said method comprising the steps of:
providing a plurality of bodies of solid aluminum material;
wetting exposed surfaces of said bodies of aluminum material with an eutectic alloy containing gallium in an amount effective to prevent passivation of said aluminum material so that said eutectic alloy spreads out over said surfaces of said bodies of aluminum material; and
reacting said bodies of aluminum material having said wetted surfaces with a hydrogen-containing oxidant so as to generate hydrogen and heat.
3. The method of claim 2 , wherein said plurality of bodies of solid aluminum material is selected from the group consisting of:
strips of aluminum material;
rods of aluminum material;
pellets of aluminum material; and
tubes of aluminum material.
4. The method of claim 2 , wherein said plurality of bodies of solid aluminum material comprises a plurality of bodies of solid aluminum material consisting essentially of pure aluminum.
5. The method of claim 2 , wherein said hydrogen-containing oxidant comprises water.
6. The method of claim 2 , wherein said hydrogen-containing oxidant comprises hydrogen peroxide, so that reacting said oxidant with said aluminum material generates oxygen in addition to hydrogen.
7. The method of claim 2 , wherein said eutectic alloy comprises gallium, indium and tin.
8. The method of claim 2 , wherein the eutectic alloy consists essentially of Gallium, Indium, and Tin.
9. The method of claim 8 , wherein said eutectic alloy comprises gallium in an amount of about 68.5% (sixty-eight and one-half percent), indium in an amount of about 21.5% (twenty-one and one-half percent), and tin in an amount of 10% (ten percent), by weight.
10. The method of claim 2 , further comprising the step of:
disrupting a pre-existing, naturally occurring oxide layer on said exposed surface of said plurality of bodies of solid aluminum material prior to wetting said surfaces with said eutectic alloy.
11. The method of claim 10 , wherein the step of disrupting said naturally occurring oxide layer on said plurality of bodies of solid aluminum material comprises subjecting said naturally occurring oxide layer to one or more members selected from the group consisting of:
mechanical disruption;
thermal disruption;
chemical disruption; and
electrical disruption.
12. The method of claim 2 , wherein the step of reacting said plurality of bodies of solid aluminum material with said oxidant comprises:
reacting said plurality of bodies of solid aluminum in a reactor vessel into which said oxidant is introduced in a controlled manner.
13. The method of claim 6 , further comprising the step of:
combusting said hydrogen and oxygen in a turbine engine.
14. The method of claim 6 , further comprising the step of:
combusting said hydrogen and oxygen in a rocket motor.