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An apparatus and method apply water to a hydrogen-containing composition, such as a hydride, in the presence of a catalyst that promotes hydrolysis to generate hydrogen in a controlled manner. The amount of catalyst used can be carefully tailored so that the reaction rate is limited by the amount of

An apparatus and method apply water to a hydrogen-containing composition, such as a hydride, in the presence of a catalyst that promotes hydrolysis to generate hydrogen in a controlled manner. The amount of catalyst used can be carefully tailored so that the reaction rate is limited by the amount of catalyst present (passive control) or it can be sufficiently large so that the reaction is controlled by the rate of water addition (active control).

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What is claimed is: 1. A hydrogen generator, comprising: a reaction chamber for containing a hydrogen-containing composition comprising a hydride and a catalyst, the hydrogen-containing composition having a set catalyst concentration to provide an expected rate of hydrogen gas generation upon addin

What is claimed is: 1. A hydrogen generator, comprising: a reaction chamber for containing a hydrogen-containing composition comprising a hydride and a catalyst, the hydrogen-containing composition having a set catalyst concentration to provide an expected rate of hydrogen gas generation upon adding an aqueous solution into the reaction chamber; wherein the set catalyst concentration is between about 0.1 wt % and about 15 wt % active element or elements of the catalyst, based on the total amount of hydrogen-containing composition and the active element or elements in the catalyst. 2. The hydrogen generator of claim 1, further comprising: means coupled to an inlet port of the reaction chamber for adding the aqueous solution all at once into the reaction chamber. 3. The hydrogen generator of claim 2, wherein the means for adding the aqueous solution is detachably coupled to the inlet port. 4. The hydrogen generator of claim 2, wherein the inlet port comprises a first fluid control device for controlling flow through the inlet port. 5. The hydrogen generator of claim 1, further comprising: an outlet port of the reaction chamber. 6. The hydrogen generator of claim 5, wherein the outlet port comprises a second fluid control device for controlling flow through the outlet port. 7. The hydrogen generator of claim 1, wherein the hydride is of a light metal selected from lithium, sodium, potassium, rubidium, cesium, magnesium, beryllium, calcium, aluminum or combinations thereof. 8. The hydrogen generator of claim 1, wherein the hydride comprises one or more covalent hydrides. 9. The hydrogen generator of claim 8, wherein the covalent hydride is a borohydride, an alanate, or combinations thereof. 10. The hydrogen generator of claim 1, wherein the catalyst comprises one or more precious metals. 11. The hydrogen generator of claim 1, wherein the catalyst comprises ruthenium. 12. The hydrogen generator of claim 1, wherein the catalyst is ruthenium, ruthenium chloride, or combinations thereof. 13. The hydrogen generator of claim 1, wherein the catalyst is cobalt, nickel, tungsten carbide or combinations thereof. 14. The hydrogen generator of claim 1, wherein the catalyst comprises one or more transition metals. 15. The hydrogen generator of claim 1, wherein the catalyst form is selected from powders, blacks, salts of the active metal, oxides, mixed oxides, organometallic compounds or combinations thereof. 16. The hydrogen generator of claim 1, wherein the catalyst is in a form of an active metal, an oxide, mixed oxides or combinations thereof, the hydrogen generator further comprises a support for supporting the catalyst on a surface of the support. 17. The hydrogen generator of claim 1, wherein the set catalyst concentration is between about 0.3 wt % and about 7 wt % active element or elements of the catalyst, based on the total amount of hydrogen-containing composition and the active element or elements in the catalyst. 18. The hydrogen generator of claim 1, wherein the hydrogen-containing composition is in a form of one or more pellets. 19. The hydrogen generator of claim 1, wherein the hydrogen-containing composition is pellets, granules, powder, tablets or combinations thereof. 20. The hydrogen generator of claim 1, wherein the hydrogen-containing composition further comprises a wicking agent. 21. The hydrogen generator of claim 20, wherein the wicking agent comprises a hydrophilic organic material. 22. The hydrogen generator of claim 20, wherein the wicking agent is selected from cellulose fibers, polyester, polyacrylamide or combinations thereof. 23. The hydrogen generator of claim 20, wherein the hydrogen-containing composition comprises at least 0.5 wt % wicking agent. 24. The hydrogen generator of claim 1, wherein the aqueous solution comprises at least 51% water. 25. The hydrogen generator of claim 24, wherein the aqueous solution further comprises an antifoam agent. 26. The hydrogen generator of claim 25, wherein the antifoam agent is a surfactant, a glycol, a polyol or combinations thereof. 27. The hydrogen generator of claim 24, wherein the aqueous solution further comprises an acid. 28. The hydrogen generator of claim 27, wherein the acid is selected from mineral acids, carboxylic acids, sulfonic acids, phosphoric acids or combinations thereof. 29. The hydrogen generator of claim 6, wherein the second fluid control device is a check valve, a ball valve, a gate valve, a globe valve, a needle valve or combinations thereof. 30. The hydrogen generator of claim 29, wherein the second fluid control device further comprises one or more actuators, the hydrogen generator further comprising a controller in communication with the one or more actuators via electronic or pneumatic means. 31. The hydrogen generator of claim 4, wherein the first fluid control device is a check valve, a ball valve, a gate valve, a globe valve, a needle valve or combinations thereof. 32. The hydrogen generator of claim 31, wherein the first fluid control device further comprises one or more actuators, the hydrogen generator further comprising a controller in communication with the one or more actuators via electronic or pneumatic means. 33. The hydrogen generator of claim 5, further comprising: a fluid separation device for removing liquid from generated hydrogen gas, wherein the hydrogen gas flows through the fluid separation device to the outlet port. 34. The hydrogen generator of claim 1, wherein the hydrogen-containing composition is supported by a porous substrate. 35. The hydrogen generator of claim 34, wherein the porous substrate is a foam. 36. The hydrogen generator of claim 35, wherein the foam is metal. 37. The hydrogen generator of claim 35, wherein the foam is of a material selected from aluminum, nickel, copper, titanium, silver, stainless steel or carbon. 38. The hydrogen generator of claim 1, wherein a surface of the substrate is treated to increase a hydrophilic nature of the surface. 39. The hydrogen generator of claim 34, wherein pores of the porous substrate contain the hydrogen-containing composition. 40. The hydrogen generator of claim 34, wherein the porous substrate is a metal. 41. The hydrogen generator of claim 1, wherein said hydrogen generator is a passively controlled hydrogen generator.